CN1215028A - Acid-base sewage PH value self-control drainage treatment technology - Google Patents

Abstract

The acid and alkali waste water pH value automatic control discharge treatment process is characterized by that it uses lift pump to deliver the waste water in the neutralization pond for discharge, its logic control unit is communicated with lift pump oultet pressure transducer and liquid level gauge, when the pH value of waste water reachs standard value, the valve is opened, the waste water is fed into the filter, before the waste water is fed into primary mixer through the filter, the waste water is respectively communicated with flowmeter and pH meter, the signal is transferred into algorithmic control unit and passed through the calculating control switch, then the acid or alkali is pumped into the waste water to make neutralization reaction, after the waste water is passed through the pH meter,the acid or alkali also is added, and then the waste water is passed through secondary and tertiary mixers to make neutralization reaction, passed through tertiary pH meter, if the waste

Description

Acid-basicity sewage PH value self-control drainage treatment technology

The present invention relates to the sewage disposal discharge method to acid-basicity.

At present, be that main its acid of Desalting Water System, alkaline sewage is main byproduct for ion-exchange.Its acid-basicity sewage quantity account for exert oneself about 25%, and wastewater flow rate and waste water pH value fluctuate.The pH value generalized case of waste water is all between 1.5-12.5, if directly discharging will make water discharge line and environment cause serious destruction and pollution.Traditional processing mode is to build three wastewater disposal basins, one of them acid pond, an alkaline pond, a neutralization tank.Sewage in acid pond and the alkaline pond is transported to neutralization tank in proportion with pump, and the pH value of looking neutralization tank again adds acid, adds alkaline purification, adjusts between the 6-9 and discharges.This processing mode can only reach about 30% draining pH value qualification rate, and the soda acid consumption of neutralization usefulness is very high, causes very big expending, and poor effect.

The objective of the invention is to propose a kind of acid-basicity sewage PH value self-control drainage technology, regulate, can be good for the requirement that the acid-basicity sewage PH value reaches discharging standards, the qualification rate height with this device and automatic control.

The present invention utilizes devices such as lift pump, strainer, mixing tank, adds automatic adjusting, and acid-basicity sewage is added acid, adds alkali by certain amount, through neutralization reaction, can finish the processing to acid-basicity sewage very soon, reaches emission standard; It is characterized in that: a, with lift pump 1 the acid-basicity sewage in the neutralization tank is sent into strainer 4 through valve, on each bar path, the rising pipe of lift pump 1 is provided with a transmitter PI01 who gathers pressure, PI02, pressure signal is delivered to logic control element SEQ01, SFQ02, simultaneously the liquid level signal LI01 in the neutralization tank is sent into logic control element SEQ01, SFQ02, work as pressure, when liquid level reaches prescribed value, logic control element SEQ01, SEQ02 opens valve, make sewage enter strainer 4, after treatment, enter one-level mixing tank 5, by under meter FI01, flow signal is sent into algorithm control unit CO01, CO02, one-level PH count detected sewage PH value PH1 and send into algorithm control unit CO01, calculate the back judgement and add acid, add alkali, open electronics surge pump 3 by multi-way switch, with the acid in the storage tank 8, alkali adds in the sewage through pH meter measuring tank 7, in one-level mixing tank 5, carry out neutralization reaction after, enter secondary again, three grades of mixing tanks 5; Before b, the sewage of handling through one-level mixing tank 5 enter secondary, three grades of mixing tanks 5, the sewage PH value PH2 that detects after handling by secondary PH meter sends into algorithm control unit CO01, CO02, algorithm control unit CO02 calculates according to PH2 and FI01,2 pairs of sewage of control multi-way switch and hydraulic diaphragm pump add acid, the alkali of trace, algorithm control unit CO01 calculates according to PH2 and FI01, control multi-way switch and electronics surge pump 3, sewage is added acid, adds alkali, sewage after adding soda acid enters secondary, three grades of mixing tanks 5, thorough mixing carries out neutralization reaction; C, the sewage PH value PH3 of three grades of PH meters detection after secondary, three grades of mixing tanks 5 are handled, send into algorithm control unit CO02 and logic control element SEQ03, algorithm control unit CO02 is according to PH3 and FI01 value, the acid, the alkali that add trace by multi-way switch control hydraulic diaphragm pump 2, carry out neutralization reaction once more through secondary, three grades of mixing tanks 5, make pH value reach center line (PH=7), when judging that according to PH3 the pH value of sewage reaches emission standard by logic control element SEQ03, open valve and discharge, defective sewage backflow is handled once more to neutralization tank.

Principle of work of the present invention: the present invention utilizes lift pump, strainer, mixing tank, valve etc., connects with pipeline, and acid-basicity sewage is automatically adjusted adds a certain amount of soda acid, makes sewage reach emission standard.At first the acid-basicity sewage in the neutralization tank is delivered in the strainer, reached certain requirement in order to guarantee flow with lift pump, can be with two, a plurality of lift pump, and can guarantee to have usefulness.While finds time in order to prevent neutralization tank, just open valve in the time of need reaching certain pressure and liquid level, in this system, a liquidometer LI01 who gathers pressure signal transmitter PI01, PI02 and collection neutralization tank liquid level signal is set on the pump discharge, the signal of gathering is input among logic control element SEQ01, the SEQ02, when reaching specified requirement, valve open on the pump discharge pipeline, sewage is sent in the strainer, remove the foreign material of sewage, prevent the obstruction of blowdown system and sampling system, and regularly strainer is washed.Filtered sewage, through three grades of mixing tanks, and adopt three grades of PH to count respectively, the pH value that enters the sewage before the mixing tank is detected, and detected value imported algorithm control unit CO01, CO02, to enter the preceding flow signal of mixing tank simultaneously is input in the algorithm control unit, as calculated, according to calculation result, add acid, add alkali, adding acid, to add alkali be through the algorithm control unit, control multi-way switch valve, hydraulic pressure, the electronics surge pump, with the acid in the storage tank, alkali is through the pH meter measuring tank, valve adds respectively in the sewage before the mixing tank, enters mixing tank and carries out neutralization reaction.In order to overcome the shortcoming that pulsed adds acid, alkali, adding on the surge pump export pipeline of soda acid, surge tank is installed respectively, guarantee that this process is steady.Simultaneously in order to prevent that the impurity that alkali produces in crystallization and the soda acid at low temperatures from stopping up volume pump, all adds strainer in the batch meter outlet.Adopt multistage PH meter and multi-level mixer, sewage is carried out stage by stage, can accelerate the acid-base neutralisation speed of response, shorten the retardation time of neutralization reaction.Through multistage blended neutralization reaction, when sewage behind third stage mixing tank, judge according to PH3, when sewage reaches emission standard, handle the valve of opening before the delivery pipe by logic control element SEQ03, with sewage discharge; Otherwise open the valve before the return line, sewage discharge to neutralization tank, is handled once more.Owing to PH meter sampling quantity is quite little, influence can be ignored to the sewage effluent pH value, so directly discharging, the PH meter washes with de-salted water, to prevent obstruction.Because one-level adds acid, it is minimum to flow effect to add alkali number, so the flow signal of algorithm control unit SEQ02 still uses FI01.

The present invention compared with prior art, following advantage is arranged: because the present invention adds acid, adds alkali and carry out neutralization reaction and make sewage reach neutral to acid-basicity sewage, so come the trip switch valve by logic, algorithm control unit, carry out neutralization reaction sewage is added a certain amount of soda acid amount greatly with what PH meter detected sewage PH value; Adding acid, alkali number finishes by multi-way switch valve, electronics, hydraulic diaphragm pump, pH meter measuring tank again.Use this technology, it is short that it regulates return time, can use water ph value in 5-6 minute and reach between the 6-9, and the actual discharge qualification rate can reach 100%; Make full use of neutralization tank, dynamic adjustments adds acid and adds alkali number, improve effectively to add acid and add alkali content, thus acid and alkali consumption amount in reducing significantly and in the discharge process; In discharging, the tolerance band of the visual downstream drain facility of pH value is optionally onlinely adjusted arbitrarily.Interconnector in the process system adopts the general international standard design simultaneously, can directly directly be incorporated into the power networks with opening DCS, universal Software Platform, is convenient to management; Equipment that adopts in the process system and instrument all adopt advanced product, the reliability height; Adopt this technology, neutralization tank can become single pond by many ponds, reduces floor space and investment; This technology can realize unidirectional control, directly discharges for the sewage of PH＞7, can add alkali for the sewage of PH＜7 and be neutralized between the PH=6-9 and discharge, and has good handiness; For being very beneficial for self-control drainage with discharge equipment in the supporting underground pump house; For in the pump house of ground and blowdown system, lift pump is selected vacuum primingpump or the supporting automatic water filling device of horizontal pump for use, has greatly improved reliability of system operation.

Description of drawings:

Figure is a process flow sheet of the present invention.

Embodiments of the invention:

The present invention utilizes lift pump, mixing tank, PH meter, under meter, by logic, algorithm control unit, acid-basicity sewage in the neutralization tank is added acid, adds alkali and carry out neutralization reaction, after the PH meter detect, make qualified sewage discharge, the underproof neutralization tank that is back to is handled again, after making sewage reach emission standard, discharging again.

Embodiment:

Be 350m now per hour to dispose of sewage ³/ h is an example: adopt two lift pump LXY100-315, connect with neutralization tank by pipeline, the diameter of rising pipe is 100 millimeters, and connect with two electrically-controlled valve, two transmitter PI01, PI02 one ends of gathering pressure signal connect with the lift pump outlet, one end connects with logic control element SEQ01, SEQ02, and the liquidometer two ends of gathering the neutralization tank liquid level signal connect with neutralization tank, two logic control element SEQ01, SEQ02 respectively; When liquid level and pump discharge pressure reach certain value, can open valve the soda acid sewage of neutralization tank is sent into strainer ZLQ150/40, filtered sewage is sent into one-level mixing tank HQ200-1.0; Before sewage enters mixing tank, count UNICOM by pipeline with the under meter, the PH that gather flow, data FI01 and the PH1 that gathers sent into algorithm control unit CO01; Flow is sent into algorithm control unit CO01, CO02 respectively; Promptly know and to add how many acid or add how much alkali by calculating the sewage that enters one-level mixing tank HQ200-1.0; Control the multi-way switch valve simultaneously and open, the acid that should add, alkali are entered the acid in the storage tank, alkali in the sewage through pH meter measuring tank (φ 1000 * 1400) by two electronics surge pump LPH7M2PICO, send into the one-level mixing tank; In order to guarantee to add acid, to add the alkali flow equalization, reduce the pulse of surge pump, adding acid, adding on the pipeline of alkali and be provided with 4 surge tank BSH-200-16; After sewage through adding acid, alkali enters the one-level mixing tank, send into secondary, three grades of mixing tanks mix; Before entering the secondary mixing tank, sewage connects with secondary PH meter, the PH meter will be sent into algorithm control unit CO01, CO02 through the pH value PH2 of the sewage behind the one-level mixing tank, at this moment algorithm control unit CO01, CO02 control the multi-way switch valve as calculated once more and add acid to sewage and add alkali through electronics surge pump LPH7M2PTC3, hydraulic diaphragm pump 880-S-AE according to the value of FI01, PH2.Sewage adds acid, enter second and third grade mixing tank thorough mixing after adding alkali, carries out neutralization reaction.Before the acid-basicity sewage behind two, three grades of mixing tanks is being discharged, is being refluxed, by the pH value PH3 after the PH meter detection sewage disposal, and PH3 sent into logic control element SEQ03, algorithm control unit CO02, see whether need add a certain amount of acid, alkali again according to the PH3 value; When acid-basicity sewage reaches emission standard,, open vent valves and discharge through logic control element SEQ03; Open return valve when defective, sewage is returned neutralization tank handle once more, through discharge index.

Claims (1)

1, a kind of acid-basicity sewage PH value self-control drainage treatment technology is characterized in that:

A, with lift pump (1) the acid-basicity sewage in the neutralization tank is sent into strainer (4) through valve, on each bar path, the rising pipe of lift pump (1) is provided with a transmitter (PI01 who gathers pressure, PI02), pressure signal is delivered to logic control element (SEQ01, SEQ02), simultaneously the liquid level signal in the neutralization tank (LI01) is sent into logic control element (SEQ01, SEQ02), work as pressure, when liquid level reaches prescribed value, logic control element (SEQ01, SEQ02) open valve, make sewage enter strainer (4), after treatment, enter one-level mixing tank (5), by under meter (FI01) flow signal of measuring is sent into algorithm control unit (CO01, CO02), one-level PH counts detected sewage PH value (PH1) and sends into algorithm control unit (CO01), calculate the back judgement and add acid, add alkali, open electronics surge pump (3) by multi-way switch, with the acid in the storage tank (8), alkali adds in the sewage through pH meter measuring tank (7), after in one-level mixing tank (5), carrying out neutralization reaction, enter secondary again, three grades of mixing tanks (5);

B, the sewage of handling through one-level mixing tank (5) enters secondary, three grades of mixing tanks (5) are preceding, the sewage PH value PH2 that detects after handling by secondary PH meter sends into algorithm control unit CO01, CO02, algorithm control unit CO02 calculates according to PH2 and FI01, control multi-way switch and hydraulic diaphragm pump (2) add the acid of trace to sewage, alkali, algorithm control unit CO01 calculates according to PH2 and FI01, control multi-way switch and electronics surge pump (3), sewage is added acid, add alkali, through adding acid, sewage behind the alkali enters secondary, three grades of mixing tanks (5), thorough mixing carries out neutralization reaction;

C, three grades of PH meters detect through secondary, sewage PH value PH3 after three grades of mixing tanks (5) are handled, send into algorithm control unit CO02 and logic control element SEQ03, algorithm control unit CO02 is according to PH3 and FI01 value, the acid that adds trace by multi-way switch control hydraulic diaphragm pump (2), alkali, through secondary, three grades of mixing tanks (5) carry out neutralization reaction once more, make pH value reach center line (PH=7), by logic control element SEQ03, when judging that according to PH3 the pH value of sewage reaches emission standard, open valve and discharge, defective sewage backflow is handled once more to neutralization tank.