DE2438279A1 - Effluent neutralisation plant - using gaseous neutralisation agent added via injector - Google Patents

Abstract

In an apparatus for neutralising effluent using a gaseous neutralising medium, in which the effluent is mixed in a reactor through which it flows with the gaseous neutralising agent via an injector, the effluent flows to the reactor through a dip pipe discharging below the effluent level therein, the feed pipe for the gaseous neutralising agent opening above this level and the gas being drawn into the effluent feed by the injector from the gas cushion above the effluent surface in the reactor. In particular, the shut-off device in the feed pipe for the gaseous neutralising agent is controlled by a pressure-measuring unit measuring the gas pressure in the gas cushion above the effluent. Provides a simple metering device for the neutralising gas with no moving parts and is not pH-dependent.

Description

Device for the neutralization of waste water with a gaseous b Neutralizing agent.

The invention relates to a device for neutralization of wastewater with a gaseous neutralizing agent, in which the one to be neutralized Waste water in a reactor through which it flows the gaseous neutralizing agent is added via an injector.

By demanding the requirements to keep water and air clean Official requirements include compliance with a waste water pH value in the area from 6.0 to 9.5 sH.

These demands are conditioned by the fact that outside of this Area damage to the building materials of the sewer systems, malfunctions biological self-cleaning by microorganisms and strong effects on the creatures of the waters can enter.

In addition, there is a requirement that, for example, the sulfate content 300 - 400 mg SO42- per liter must not be exceeded. Due to its own sulphate content the water are already more or less narrow limits. Through helten Sulphate content changes in the concrete structure both at the sewerage material as well as building foundations. because sulphates are largest after leaving the sewage treatment plant partly remain recovered in the groundwater.

In the neutralization of wastewater, acidic wastewater is mixed with alkalis and alkaline wastewater neutralized with acids.

with neutral salts in compliance with the required pH values must form.

In a known method for the neutralization of waste water with A gaseous neutralizing agent turns alkaline wastewater through a drain pump pumped into a reactor. As soon as this reactor is filled, a circulation pump is used put into operation and a pH-MeAwertelectrode measures the pH-Tstwert. One regulator automatically compares the measured value with the pH setpoint and controls accordingly the flow of CO2 gas that srormixed with the waste water in an injector nozzle and is distributed homogeneously over the entire contents of the container. The circulation pump leads a relatively large amount of fluid in the circuit and thus causes a good Absorption.

The pH value of the water is checked and in the drain line recorded by a scribe. Wastewater with a pH value above the target value, are fed back to the collecting tank from which the reactor is fed.

Such systems are characterized by very small construction volumes. However the metered addition of the gaseous Neutralizing agent, preferably CO2 depending on the pH value and is therefore very expensive.

A simpler consumption-dependent CO2 dosage is provided with so-called aeration agitators. In such systems, the alkaline wastewater by means of a drain pump from a collecting tank continuously into a reactor pumped and off with a special aeration agitator with the gaseous neutralizing agent mixed.

In such systems, however, an agitator must be installed in a pressure vessel work, so that certain sealing problems are to be expected.

The object of the invention is to provide a device for neutralization of wastewater with a gaseous neutralizing agent, the one to be neutralized Waste water in a reactor through which it flows the gaseous neutralizing agent is admixed via an injector to improve such that a simple Dosing possibility for the gas results, so no longer worked depending on the pH value and there are no moving parts, i.e. no shaft entries in the printing part, so that sealing problems are eliminated.

This object is achieved according to the invention in that in the Device specified above, the wastewater from the reactor through one of its Mirror in the reactor, the submerged tube, the feed line for the barrel-shaped Neutralizing agent flows in above the sewage level and the injector does gaseous neutralizing agents from the gas cushion above the sewage level in sucking in the inlet for the wastewater.

The shut-off element is a further development of the invention for the supply of the gaseous neutralizing agent from one of the gas pressure of the Gas cushion controlled above the sewage level measuring pressure gauge.

The drawing shows an exemplary embodiment for a device according to the invention.

The collecting tank 1 flows through line 2 of the to be neutralized Sewage too. The waste water is removed from the collecting tank 1 with the aid of the reactor pump 3 sucked off via the line 4 and introduced into the reactor 6 via the dip tube 5. The line 7 for the gaseous neutralizing agent leads into the upper part of the reactor 6, the flow of which is controlled via a valve 8.

The reactor 6 is filled up to the level N with waste water, so that the dip tube C dips below the level of the waste water in the reactor 6. In the gas cushion 9 above the level N of the wastewater in the reactor 6 is an injector on the dip tube 5 10 provided, from the gas cushion 9 gaseous neutralizing agent in the Sucking in the inlet of the sewage through the dip tube 5 and a good at the nozzle 11 mixed mixture of waste water and gaseous neutralizing agents escape leaves.

The neutralized wastewater leaves the cattle through the valves 12, 13 Sequence 14 the system lind fli.eEt to the sewer. At 15 a pH measuring device is indicated, which controls the valve 13 via corresponding devices in the control panel 16.

17 denotes a signaling device, 18 a writer.

In addition, valves 19, 20 are in a circulation or return line 21, which like the pump 3 of corresponding devices on the control panel 16 are taxed. At 22 a pressure measuring device ap is indicated, which can be used to the gas pressure of the gas cushion 9 above the sewage level (N) to measure up. The measured value can serve the supply line (7) for the gaseous neutralization control medium with the help of valve 8 7.11.

Patent claims:

Claims (2)

P a t e n t a n s p r ü c h e: 1. Device for neutralization of wastewater with a gaseous neutralizing agent, the one to be neutralized Waste water in a reactor through which it flows is the gaseous neutralizing agent is admixed via an injector, d a d i r c h v e n n z i. c h n e t that the wastewater to the reactor (6) through a submerged below its level (N) in the reactor Tach tube (5) flows in, the feed line (7) for the gaseous neutralizing agent opens above the sewage level (N) and the injector (10) the gaseous Neutralizing agent from the gas cushion (9) above the sewage level (N) into the Sucks in inlet (5) for the wastewater. 2. Apparatus according to claim 1, characterized in that the shut-off element (8) for the supply of the gaseous neutralizing agent from one of the gas pressure of the gas cushion above the sewage level (N) measuring pressure gauge (22) is.