RECYCLED IRRIGATION WATER TREATMENT SYSTEM
REFERENCE TO RELATED PATENT APPLICATION
The present application is a continuation-in-part of copending
United States Patent Application Serial No. 10/022,568, filed on
December 13, 2001, entitled "Golf Course Irrigation Water Monitoring
And Treatment System" by the same inventors herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to irrigation of man-made landscaped
and/or agricultural areas, such as parklands, playing fields, farmland for
produce or flowers, and especially for golf courses. It is particularly
useful for these areas when using reclaimed water. More specifically, the
invention is a process for monitoring and treating reclaimed water to use
reclaimed water efficiently and without harmful effects from undesirable
constituents for the aforesaid irrigation purposes. It includes monitoring
numerous water quality characteristics and when predetermined
acceptable parameter ranges see deviations, signaling alarms and/or
treating the undesirable condition with dechlorination. It also includes an
oxidation system for continuous or continual operation.
2. Information Disclosure Statement
The following patents are representative of the state of the art with
respect to various teachings relating to water treatment:
United States patent number 6,214,607 describes a new method of
treating water to remove perchlorate contaminant is disclosed. Water is
fed through a filter bed containing perchlorate-reducing microorganisms.
The microorganisms reduce the perchlorate, thereby decontaminating the
water. An oxidizable substrate serves as an electron donor to the
microorganisms. The invention results in safe to undetectable levels of
perchlorate in the treated water.
United States Patent number 6,200,466 describes a reactor system for
decontamination of water by photolytic oxidation utilizing near
blackbody radiation, the system comprising (1) a reaction chamber
defining an internal space with an inlet and an outlet; and (2) a
broadband radiator for generating radiant energy with wavelengths
between about 150 nm and about 3um, the broadband radiator disposed
within the reaction chamber, such that a sufficient dosage of broadband
radiation irradiates the contaminants and/or the oxidant within the
internal space of the reaction chamber thereby causing photolytic
oxidation of the contaminants by direct action of the radiation on the
contaminants to break chemical bonds by sustaining a free radical chain
reaction of oxidizing components, thus breaking down the contaminants
by way of atomic abstraction of the components of the contaminants. In
preferred embodiments, at least a portion of the radiant energy is
generated in a pulsed node, such as between about 1 and 500 pulses per
second. In preferred embodiments, the broadband radiator generates
radiant energy at a rate of between about 1 kW and about 10 MR, and
the resultant dosage rate of broadband radiation is between 1 joule/cm2.
In preferred embodiments, the radiant energy is produced by at least one
gas filled flashlamp having a gas plasma temperature of between about
9,500 K and about 20,000 K.
United States Patent number 6,136,186 describes a method and
apparatus for mineralizing organic contaminants in water or air provides
photochemical oxidation in a two-phase boundary system formed in the
pores of a TiO2 membrane in a photocatalytic reactor. In the three-phase
system, gaseous (liquid) oxidant, liquid (gaseous) contaminant, and solid
semiconductor photocatalyst meet and engage in an efficient oxidation
reaction, The porous membrane has pores which have a region wherein
the meniscus of the liquid varies from the molecular diameter if water to
the of a capillary tube resulting in a diffusing layer that is several orders
of magnitude smaller than the closest known reactors. The photocatalytic
reactor operates effectively at temperature and low pressures. A packed-
bed photocatalyst coated particles is also provided.
United States Patent number 6,132,138 describes a gray water
recycling invention that utilizes filtered gray water for maintaining
constant moisture levels in building foundations and for other irrigation
uses. It allows for the mixture of pesticides with a gray water stream
injected under a building in order to treat for insects. Additionally,
pesticides, fungicides or fertilizers can be injected into a gray water
stream prior to its application in landscape irrigating. This invention has
application in single residence and fill development real estate settings.
United States Patent number 6,117,335 describes a reactor system for
decontamination of water by photolytic oxidation utilizing near
blackbody radiation, the system comprising (1) a reaction chamber
defining an internal space with an inlet and an outlet; and (2) a
broadband radiator for generating radiant energy with wavelengths
between 150 nm and about 3 μm, the broadband radiator disposed within
the reaction chamber, such that a sufficient dosage of broadband
radiation irradiates the contaminants and/or the oxidant within the
internal space of the reaction chamber thereby causing photolytic
oxidation of the contaminants by way of atomic abstraction of the
components of the contaminants. In preferred embodiments, at least a
portion of the radiant energy is generated in a pulsed mood, such as
between 1 and about 500 pulses per second. In preferred embodiments,
the broadband radiator generates radiant energy at a rate of between
about 1 kW and about 10 MW., and the resultant dosage rate of
broadband radiation is between 1 joule/cm and about 5000 joules/cm .
In preferred embodiments, the radiant energy is produced by at least one
gas filled flashlamp having a gas plasma temperature of between 9,500°
K. and about 20,000 ° K.
United States Patent number 5,975,800 relates to a method for
treating groundwater in situ in rock or soil. An elongate permeable
upgradient zone and an elongate permeable downgradient zone, each in
hydraulic communication with a permeable subsurface treatment zone
and having a major axis parallel to a non-zero component of the general
flow direction, are provided in the subsurface by any of a number of
construction methods. The upgradient zone, downgradient zone, and
treatment zone are situated within the subsurface medium and have
permeabilities substantially greater than the adjacent subsurface
medium's permeability. Groundwater is allowed to move from the
subsurface medium adjacent to the upgradient zone into the upgradient
zone, where the groundwater refracts and moves to a treatment zone by
an in situ treatment process, such as a process employing air sparging,
sorption or reaction with zero-valent iron, the groundwater moves into,
through and out of the downgradient zone into the subsurface medium
adjacent to the downgradient zone. The method does not require
pumping. A method for directing groundwater around a particular
location to prevent contamination of the groundwater by a contaminant
located at the particular location, to prevent migration of a contaminant
located at a particular location, to reduce the flow velocity of
groundwater in the particular location, or to increase the residence time
in an in situ treatment center located downgradient from the particular
location is also disclosed.
United States Patent number 5,958,241 describes a method and a
system for the treatment of organic hazardous wastes from plant waste
and associated wastewater treatment processes, whereby the waste is
either introduced directly, or continuously separated from wastewater,
and routed to a bioreactor, and whereby no organic solids are generated
for further offsite disposal. The system disclosed includes a bioreactor,
containing selected bacteria, untreated sludges, and recirculated biomass,
and a liquid/solid separator allowing water to be utilized elsewhere in the
system and returning solids to the bioreactor. The biodegradation
process, initiated continuously, converts hazardous organic constituents
in waste stream and wastewater sludges from plant operations to inert
materials, for extensive periods of operation, without the need for solids
removal, external solids treatment or disposal.
United States Patent number 5,893,975 treats a variety of flowing
wastewater effluents, provides pre-treatment clog-reducing wastewater
sludge disintegration, and adds pretreatment nutrients to wastewater so
as to enhance microbial growth therein for improving the effectiveness
and efficiency of wastewater treatment. The constructed wetland
includes a wastewater treatment system having a flow intake, a pre¬
treatment nutrient addition chamber, and a wastewater flow divider. The
flow divider further has a compressed air aerator in the bottom thereof.
The constructed wetland includes one or more treatment cells having a
soil, fine stone, organic and/or synthetic material substrate cap covering
a further substrate media accommodating the wastewater to be treated.
The substrate cap is populated by natural plants having root systems
extend from the substrate downward into the wastewater being treated,
and the roots serve to physically and/or biologically mediate the removal
of undesirable components from the wastewater. The constructed
wetland includes a treated water discharge conduit for discharging the
flowing water into a desired after treatment water utilization modality,
such as to discharge to the ground or to a body of water.
United States Patent number 5,863,433 relates to the design and
operation of paired subsurface flow constructed wetlands in which
significant improvements in wastewater treatment are possible. These
improvements are brought about by coupling paired subsurface flow
wetlands and using reciprocation, whereby adjacent cells are sequentially
and recurrently drained and filled using either gravity, mechanical
pumps, U-tube air-lifts and/or a combination thereof. This fill and drain
technique turns the entire wetland area into a biological reactor,
complete with anoxic, anaerobic environments. The frequency, depth
and duration of the fill and drain cycle can be adjusted to control redox
conditions for specific biologically mediated reactions including, but not
limited to, nitrification, denitrification, sulfate reduction, and
methanogenesis. Emissions of noxious gases such as hydrogen sulfide
and methane can be minimized. Furthermore, by allowing cells to fill to
above the level of the substrate by approximately 2 to 4 inches on the fill
cycle, it is possible to enhance algae photosynthesis, increase pH, and
facilitate photo-oxidative reactions.
United States Patent number 5,792,336 describes a two stages
electrocatalytic method for oxidative-purification of wastewater from
soluble substances, such as toxic chemical admixtures difficult of
oxidation, including dye-stuffs, detergents, phenols, cyanides and the
like, which stages inactivate the soluble substances present in the
wastewater in a synergistic fashion and, therefore, are highly efficient,
the method comprising the steps of (a) in a first stage, electrochemically
treating the wastewater in the presence of chlorine ions, such that
chlorine-containing oxidizing agents are formed and at least partially
oxidize the soluble substances in the wastewater; and (b) in a second
stage, catalytically treating the first stage treated wastewater in presence
of a non-chlorine oxidizing agent and an added catalyst, such that
remains of the soluble substances are further oxidized, and such that the
chlorine-containing oxidizing agents formed during the first stage are
catalytically reduced; wherein, the first stage and the second stage act
synergistically to purify the wastewater from the soluble substances.
United States Patent No. 4,867,192 describes an automatically
controlled irrigation water pH amendment system and apparatus
associated with golf courses utilizing automatic irrigation system to
irrigate the various species of turf grasses used on fairways, tees, greens
and other areas; being adapted to receive an operator pre-selected
program of desired irrigation water pH value; to monitor the delivered
pH value of the irrigation water and automatically blend into the
irrigation water in the flow circuit between the discharge of the irrigation
pump station pumps and the pH monitoring point the proper amount of
chemical additive to amend-raise or lower-the pH of the delivered
irrigation water. The desideratum is a uniformly blended mixture of
liquid acid or base chemical with irrigation water to maintain a solution
of the water pH value desired by the operator to promote proper
agronomic practice in the maintenance of the turf grasses. This objective
has been found to be obtainable by causing the two liquids to be blended
in the proper ratios through the use of an acid tank, pH sensing probe,
sulfuric acid injector pumps, acid manifold, booster pump, flow velocity
measuring device, and a solid-state electrical programmable controller;
connected to the upstream and downstream ports of an ordinary pressure
sustaining valve or differential pressure orifice device as used in the
discharge line of a golf course pumping station.
Notwithstanding the prior art, the present invention is neither
taught nor rendered obvious thereby.
SUMMARY OF THE INVENTION
The present invention is a process for the irrigation of man-made
landscaped areas, including golf course greenery, utilizing reclaimed
wastewater. In the process, a source or supply of reclaimed water is
procured which is selected from the group consisting of treated sewage
wastewater, untreated sewage wastewater and natural water supply water
containing sewage wastewater. The reclaimed water is subjected to a
plurality of monitors for testing to obtain a plurality of test results for
water quality characteristics, that include: (i) pH; (ii) residual chlorine;
and (iii) sodium. Optionally, either total organic compounds or chlorides
may also be included. These monitors are sometimes referred to as
analyzers, and the two terms are used herein interchangeably. The test
results or analyzer results are inputted to a computerized data handling
system for data collection, storage and analysis and for comparison to
predetermined acceptable ranges for each of the aforesaid water quality
characteristics.
Feedback is provided to show any water quality characteristic
deviating from predetermined acceptable ranges that effect signaling
and/or treatment. Feedback is also provided to enable a maintenance
keeper or other grounds personnel or service to determine fertilization
requirements.
The reclaimed water is then passed through a dechlorination
system.
The dechlorination system is for treating the reclaimed water with a
dechlorination agent to maintain a level of residual chlorine below a
predetermined maximum of a predetermined acceptable range, and is
activated in response to feedback from the computerized data handling
system when showing deviation from the predetermined acceptable
range for residual chlorine.
In the event that optional organic compound monitoring and treatment
is included in the process, an oxidation system will be included.
The oxidation system is for treating the reclaimed water with an
oxidizing agent to maintain a level of organic compounds below a
predetermined maximum of the predetermined acceptable range. In
essence, the oxidizing system is used to destroy undesirable organics,
including biological organisms, herbicides and pesticides. It is activated
on a continuous or continual basis and could be adjusted by appropriate
personnel in response to feedback from the computerized data handling
system when showing deviation from the predetermined acceptable
range for total organic carbon compounds. In preferred embodiments, it
is run on a continuous basis automatically.
The resulting treated reclaimed water is next used to irrigate a golf
course area, unless there is a deviation from one of the water quality
characteristics being monitored which causes an alarm to signal, in
which cause personnel will shut down the irrigation and take corrective
measures, such as by-pass, treat, hold or recycle.
The predetermined acceptable ranges are set in accordance with safe
use conditions prescribed or desired by the user. In some preferred
embodiments, these characteristic parameters are set within the
following ranges:
(i) for residual chlorine, 0 milligrams per liter to 1 milligrams per
liter;
(ii) for pH, 6 to 8; and
(iii) for sodium, 0 milligrams per liter to 70 milligrams per liter.
For optional organic compound treatment or optional chloride
compound treatment characteristic parameters are set within the
following ranges:
(iv) for total organic carbon compounds, 0 milligrams per liter to
50 milligrams per liter; and,
(v) for chloride compounds, 0 milligrams per liter to 70
milligrams per liter.
In some embodiments, the data obtained in the process of the
present invention by the computer from the monitors is utilized to
provide control and assessment of turf and plant fertilizer needs. Also,
the data may be logged and stored to create an historical base and the
data may be reviewed or presented to establish water quality trends.
In some preferred embodiments, the process includes at least one
additional monitor to obtain test results selected from the group
consisting of the following water quality characteristics:
(vi) hardness; (vii) turbidity; (viii) alkalinity; and (ix) conductivity.
In some preferred embodiments, all of these four water quality
characteristics are included.
In some preferred embodiments, the process predetermined
acceptable ranges for the following water quality characteristics are set
within the following ranges:
(vi) for hardness, 0 to 200 milligrams of calcium carbonate per liter ;
(vii) for turbidity, 0 to 10 nephelometric turbidity units ;
(viii) for alkalinity, 0 to 200 milligrams per liter total alkalinity; and
(ix) for conductivity, o to 4000 microSiemens per centimeter.
As mentioned, the process of the present invention computerized
data handling system provides feedback to show any water quality
characteristic deviation, and the process includes initiating an alarm
selected from the group consisting of audio alarms, visual alarms and
combinations thereof, when selected characteristic deviations occur.
Thus, the alarm(s) would signal in response to deviations for pH,
residual chlorine or sodium, and for hardness, alkalinity, turbidity and
conductivity and optional TOC or chloride compounds when monitors
are included for these characteristics. For example, the alarm system may
include direct contact alarm signaling to a groundskeeper superintendent
or other facility manager.
In the most preferred embodiments of the present invention, the
process is one wherein the dechlorination system is a vitamin C
dechlorination system wherein vitamin C agent is fed into the reclaimed
water in response to the computerized data handling system showing a
deviation from the predetermined acceptable range for residual chlorine.
Also, in those embodiments of the present invention that include
TOC treatment, the process is one wherein the oxidation system is
ozone, where in ozone is fed into the reclaimed water at the rate
established by the TOC output. In this embodiment hydrogen peroxide
is fed at the ozone reactor to further promote oxidation.
In some embodiments of the present invention process, a nitrate
monitor is included and preferably, the predetermined acceptable ranges
for nitrate are set within the range of 0 to 100 milligrams per liter nitrate
as nitrogen.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention should be more fully understood when the
specification herein is taken in conjunction with the drawings appended
hereto wherein:
Figures 1 and 2 show schematic diagrams for two embodiments
of the present invention golf course irrigation system; and,
Figure 3 illustrates the required and optional features of the
computerized data handling system used in the present invention golf
course irrigation system.
DETAILED DESCRIPTION OF THE PRESENT INVENTION
The present invention relates to irrigation of man-made or man kept
greenery, such as ball fields, parks, agricultural areas, farmland and
horticulture areas, driving ranges, and golf course areas to maintain
greenery and plantlife. Fairways, greens and surrounding plantlife and
other greenery are more efficiently irrigated with reclaimed or recycled
water. Otherwise, irrigation would be prohibitively expensive and would
involve inefficient use of precious potable water. Many ball parks, fields,
country clubs and public golf courses utilize reclaimed water to irrigate
their facilities. Such reclaimed water is sewage wastewater which has
been treated or untreated (as by negligence, accident or defiance of
applicable laws and ordinances) and may come from a municipal, county
or other government operated or privately operated treatment facility, or
may come from a natural water source, such as a stream, river or other
water source into which treated and/or untreated sewage wastewater has
been dumped. These reclaimed water sources provide essential irrigation
water, but sometimes contain undesirable, harmful components, such as
biologically harmful nematodes, pesticides, fungicides and other
organics, chlorine, excess nitrogen and excessive minerals. These and
other water quality characteristics, such as turbidity, pH, alkalinity and
hardness, may either cause or be indicative of components, which cause
harm and even death to vegetation such as grass and plants. For these
reasons, the present invention has been developed to both treat
undesirable reclaimed water constituents and/or set of alarm(s) to signal
to maintenance to shut down or correct problems before the reclaimed
water is used for irrigation. One critical feature of the present invention
is to collect data and to establish predetermined acceptable ranges of
water quality characteristics within which the reclaimed water must fall
or an alarm or treatment or both will occur. Another critical feature is the
automatic initiation and control of dechlorination in response to residual
chlorine levels, being outside of predetermined acceptable ranges. In the
present invention, the process involves the use of monitors, a
computerized data handling system, and a dechlorination system.
Referring now to Figure 1, there is shown a schematic representation
of one embodiment of the present invention. In Figure 1, reclaimed water
form any one or more of the sources mentioned above is piped into a golf
course facility via piping 3. A pH monitor 5, a residual chlorine monitor
9 and a sodium monitor 11 are connected to piping 3 for
testing/monitoring of those water quality characteristics. The residual
chlorine monitor (analyzer) could be two different units or a single unit.
However, chloride compound water quality characteristic may be used
for a shutdown determination, whereas the active chlorine water quality
characteristic may be used for an automatic interactive treatment, i. e.
dechlorination. The aforesaid monitors are electronically connected to
computer/data handling system 13 for input thereto of monitor tests
results from the reclaimed water stream of piping 3. Alternatively, these
monitors (and others described below) could be connected to a holding
tank, a pond or other natural waterway or other manmade holding
facility, for testing. The details of the functionality of a preferred present
invention computer/data handling system 13 are set forth in conjunction
with Figure 3 below.
In general, the computer/data handling system (CDHS)13 has three
primary objectives: (a) it collects and stores data and retains
predetermined acceptable ranges (criteria) for the data and compares the
data to the criteria; (b) it sets off one or more alarms 15 when the pH, the
residual chloride, or the sodium readings (or other optional water quality
characteristics readings described below) deviate from predetermined
criteria, i. e., set ranges, such as, hypothetically, 0 to 2500 mg/1 or 5 to 7;
and (c) it initiates automatic treatment when the residual chlorine or the
TOCs exceed acceptable criteria.
Thus, piping 3 is connected to dechlorination system 17 for treatment
at the desired times, i. e. as needed, when determined by the
computer/data handling system 13. The CDHS 13 receives the data from
the monitors and when the residual chlorine is excessive, it initiates the
dechlorination system 17. The adjusted (treated) reclaimed water is then
sent to a conventional golf course irrigation system 21, such as automatic
sprinklers, etc. As an extra precaution, residual chlorine monitoring and
pH monitoring may be also conducted post-dechlorination to confirm
that levels remain within acceptable ranges after treatment. If these post-
treatment monitorings show unacceptable results, then adjustments may
be included in the programming, or alarms or shutdowns may be
proscribed, depending upon the facilities, system and risk management
of the user.
Figure 2 shows another present invention system with more options
and preferred details. Here items identical to those shown in Figure 1 are
identically numbered, and, to the extent that they are not further
described here, function as described here conjunction with Figure 1
above. In Figure 2, additional monitors have been included. These are
the optional TOC monitor 7, hardness monitor 23, alkalinity monitor 25,
conductivity monitor 27 and turbidity monitor 29. They are connected to
the piping3 for reclaimed water analysis and, when excessive are alarm
initiation water quality characteristics. All of these monitors, any one of
these or any combination of these, could be included within the scope of
the present invention, and Figure 2 represents only one preferred
embodiment.
In Figure 2, the dechlorination system is specified as Vitamin C
dechlorination, and this is clearly the preferred dechlorination agent. An
optional holding pond 31 for storage is also shown downstream from the
treatment stage, and upstream from the actual irrigation. In this
embodiment, the reclaimed, monitored and treated, as needed water is
stored until needed.
Referring to Figure 3, the diagram shows the details of the
computerized data handling system 51, illustrating required functions 53
and optional functions 55.
EXAMPLE
The system of the present invention shown in Figure 1 above with the
functions shown in Figure 3 is deployed at a privately owned golf course
utilizing ponded (lagooned) municipal wastewater and storm water
runoff for the reclaimed water. The municipal wastewater undergoes
primary and secondary sludge wastewater treatment before ponding.
The following monitors are included:
(1) pH Monitor- EC 310 Model from Hach Company, measures full
range from ) 1 to 14.
(2) Hardness Monitor- SP 510 Harness Monitor from Hach
Company, measures hardness expressed as ppm, and as mg
calcium carbonate per liter.
(3) Alkalinity Monitor- APA Alkalinity Process Analyzer from Hach
Company, measures total alkalinity as ppm.
(4) Conductivity Monitor- Model 9782 Conductivity Analyzer from
Honeywell Company, measures micromhos and megohms per
cm.
(5) Turbidity Monitor- Model 1720D Turbidimeter from Hach
Company, measure turbidity in nephelometric turbidity units
(NTU), with a 0 to 100 range and 0.001 resolution.
(6) Chloride compound/residual chlorine Monitor- Model CL17
Chlorine Analyzer from Hach Company, measures free (active)
chlorine and total chlorine content, range of 0 to 5 mg per liter.
(7) Sodium Monitor- HACH Model 9073 Sodium Analyzer
measures soluble sodium, range of 0 to 10,000 ppm.
(8) Nitrate Monitor- APA 6000 Nitrate Analyzer measures
soluble nitrates a nitrogen in mg per liter, ppm and ppb.
The system includes post treatment ponding and a conventional
irrigation system. As the reclaimed monitor is piped into the system, all
of the monitors, either periodically or by preprogrammed schedule, or in
some cases, continuously monitor the system. As the reclaimed water
passes through with all water quality characteristics measuring within
predetermined ranges, the water is simply fed to the holding pond as
needed. When the residual chlorine exceeds the desired range, the
dechlorination system is initiated and will run until the readings fall
within the acceptable range. As a precaution, post treatment readings are
also taken and, if unfavorable, the computer may increase treatment,
signal an alarm, shutdown the flow or some combination thereof.
Likewise, in those situations where optional TOC monitoring and
treatment are included, when the TOC exceeds its acceptable range, the
oxidation system feed rate will be adjusted to increase dosage until the
TOC readings fall back into the acceptable range. When any one or more
of the other monitored water quality characteristics exceed their
acceptable ranges, either an alarm will signal and/or a shutdown will
occur. The system results in the avoidance of harmful factors being
entered into the irrigation system and damaged and/or destroyed plantlife
is eliminated.