CN102249391B

CN102249391B - Anion and cation bed regeneration sewage treatment pH control system

Info

Publication number: CN102249391B
Application number: CN2011102031477A
Authority: CN
Inventors: 张晓军; 刘刚
Original assignee: SHENYANG KASITE TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: SHENYANG KASITE TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2011-07-20
Filing date: 2011-07-20
Publication date: 2012-11-07
Anticipated expiration: 2031-07-20
Also published as: CN102249391A

Abstract

The invention relates to an anion and cation bed regeneration sewage treatment pH control system. The system comprises an anion and cation bed regeneration sewage treatment front control part, a central control room, an anion and cation bed regeneration sewage control station and a power distribution room. By a complete pipeline neutralization mode and a regulation and control technology, through a control combination with a lift pump, sewage in a buffer tank is mixed and subjected to neutralization reaction by a static mixer, the lift pump is completely or partially controlled by a frequency converter to ensure that premixing, dosing and discharging operation can be performed as long as acidic sewage exists in the buffer tank, the existing acid and alkali in the sewage are furthest used for preneutralization, buffering and discharging are performed simultaneously, and the utilization efficiency of the buffer tank is improved.

Description

Negative and positive bed regenerated sewage is handled the pH system

Technical field

The present invention relates to a kind of sewage treatment control system, particularly a kind of negative and positive bed regenerated sewage is handled the pH system.

Background technology

Traditional negative and positive bed regenerated sewage is handled the pH system, is basically to adopt manual mode to accomplish.The Buffer Pool that two groups or more is generally arranged, every group of Buffer Pool gone back the double as neutralization tank simultaneously.Treating processes roughly is to play circulation through lift pump, in the pool of buffer pond with sun bed regenerated sewage and cloudy bed regenerated sewage through stirring pre-neutralization, add certain acid/alkali again, make it to reach and open bleed valve closing volume valve after the emission standard and discharge; This moment, other Buffer Pool was then collected negative and positive bed regenerated sewage.Each organize Buffer Pool by buffering with in be used alternatingly with function.The subject matter of its existence is: Buffer Pool is nervous and since in the Buffer Pool must with one group as neutralization tank usefulness, neutralization reaction could reuse after accomplishing discharging, service efficiency reduces greatly, causes Buffer Pool volume anxiety; Labour intensity is big, although electrically operated valve and in-line meter have been installed in part negative and positive bed regenerated sewage processing scene, neutralizes and racks up and also will lean on manual operation to accomplish, and labor intensity of operating personnel is bigger;

Electric power and soup consumption are big, and the Buffer Pool volume is not enough, and sewage showed strong acid/alkalescence, must add acid/alkali soup and neutralize, and only must add alkali lye in theory, and the acid that adds is actually waste; Pre-neutralization realizes that through the lift pump circulation Buffer Pool that has has also been installed whisking appliance, and power consumption is bigger.

Summary of the invention

The objective of the invention is to, adopt in the complete pipeline with mode with regulate control techniques, through with the control combination of lift pump; The mixing of Buffer Pool sewage is carried out neutralization reaction and is adopted static mixer; The all or part of employing Frequency Converter Control of lift pump as long as have sour water just can carry out premix dosing emissions operation in the Buffer Pool, maximally utilises that original soda acid carries out pre-neutralization in the sewage to guarantee; To realize limit buffer edge discharging, the Buffer Pool utilising efficiency improves.

For the technical problem that solves prior art realizes above-mentioned purpose; The technical scheme that the present invention adopts is: negative and positive bed regenerated sewage is handled the pH system, comprising: control part, Central Control Room, negative and positive bed regenerated sewage control station, power distribution station before negative and positive bed regenerated sewage is handled.Negative and positive bed regenerated sewage is handled parts such as preceding control; Constitute by alkali jar, acid jar, lift pump, static mixer, pH transmitter, volume pump, bleed valve, reverse flow valve, Buffer Pool A, Buffer Pool B, liquid level sensor; AI Buffer Pool and AII Buffer Pool are arranged in the Buffer Pool A; The AI Buffer Pool annotates sour valve with the AI pond respectively and AI pond reverse flow valve forms loop, and the AII Buffer Pool annotates sour valve with the AII pond respectively and AII pond reverse flow valve forms loop; BI Buffer Pool and BII Buffer Pool are arranged in the Buffer Pool B, and the BI Buffer Pool annotates sour valve with the BI pond respectively and BI pond reverse flow valve forms loop, and the BII Buffer Pool annotates sour valve with the BII pond respectively and BII pond reverse flow valve forms loop;

AI Buffer Pool liquid level sensor is installed in the AI Buffer Pool, and AII Buffer Pool liquid level sensor is installed in the AII Buffer Pool, and BI Buffer Pool liquid level sensor is installed in the BI Buffer Pool, and BII Buffer Pool liquid level sensor is installed in the BII Buffer Pool; Buffer Pool A is connected with the acid jar respectively with Buffer Pool B, and Buffer Pool A is connected with reverse flow valve through pipeline with Buffer Pool B and connects static mixer again, and the pH transmitter is installed respectively in the static mixer rear end separately; Two parallelly connected volume pumps are arranged between static mixer, and volume pump is connected to the alkali jar; Static mixer is connected with four groups of lift pumps; In addition, four groups of lift pumps connect in AI Buffer Pool and AII Buffer Pool, the BI Buffer Pool and the BII Buffer Pool simultaneously; Wherein two lift pumps connect AI Buffer Pool and AII Buffer Pool, and two other lift pump connects in the BI Buffer Pool and the BII Buffer Pool.At static mixer and pH transmitter one side bleed valve is installed;

Simulating signal input AI is connected with each transmitter respectively in the Central Control Room control; Simulating signal is exported AO, is connected with each lift pump, volume pump respectively; Numerary signal output DO is connected with each valve respectively; PLC sends sensor signal to negative and positive bed regenerated sewage control station, passes back to PLC through controlling the output signal again after the analytical calculation of negative and positive bed regenerated sewage control station.

The invention has the beneficial effects as follows: can start the lift pump more than two simultaneously during discharging, the requirement of the load-carrying capacity of single pump has been reduced, therefore, lift pump adopts Frequency Converter Control, under the prerequisite that total cost does not increase, also can play reduction running cost.Variable frequency pump premix loop uses the interior sewage of Buffer Pool to carry out self-neutralization as far as possible, reaches the purpose of practicing thrift alkali lye.Foundation is that each Buffer Pool sewage totally is pH value different characteristic; Utilized farthest that original sewage carries out pre-mixing in the Buffer Pool; Through with the control combination of lift pump; As long as the ability of dosing volume pump is enough, can realizes premix dosing discharging, and guarantee as long as have sour water just can carry out premix dosing emissions operation in the Buffer Pool.Maximally utilise that original soda acid carries out pre-neutralization in the sewage.Realized limit buffer edge discharging, the Buffer Pool utilising efficiency increases substantially.

Description of drawings

Fig. 1 is a control texture synoptic diagram of the present invention.

Shown in the figure: alkali jar 1; Acid jar 2; AI pond lift pump 3; AII pond lift pump 4; BI pond lift pump 5; BII pond lift pump 6; Static mixer 7; Static mixer 8; PH transmitter 9; PH transmitter 10; Annotate alkali volume pump 11; Annotate alkali volume pump 12; Bleed valve 13; Reverse flow valve 14; AI annotates in the pond sour valve 15; AI pond reverse flow valve 16; AII annotates in the pond sour valve 17; AII pond reverse flow valve 18; Sour valve 19 is annotated in the pond; BI pond reverse flow valve 20; BII annotates in the pond sour valve 21; BII pond reverse flow valve 22; AI Buffer Pool 23; AII Buffer Pool 24; BI Buffer Pool 25; BII Buffer Pool 26; AI Buffer Pool liquid level sensor 27; AII Buffer Pool liquid level sensor 28; BI Buffer Pool liquid level sensor 29; BII Buffer Pool liquid level sensor 30; PLC 31; Negative and positive bed regenerated sewage control station 32; Simulating signal input AI; Simulating signal output AO; Numerary signal output DO.

Embodiment

Control part, Central Control Room, negative and positive bed regenerated sewage control station, power distribution station were formed before system was handled by: negative and positive bed regenerated sewage.Control section is by: alkali jar, acid jar, lift pump, static mixer, pH transmitter, volume pump, bleed valve, reverse flow valve, Buffer Pool, liquid level sensor formation., negative and positive bed regenerated sewage controls in the part before handling: AI Buffer Pool 23 and AII Buffer Pool 24 are arranged in the Buffer Pool A; AI Buffer Pool 23 is annotated sour valve 15 with the AI pond respectively and is formed loop with AI pond reverse flow valve 16, and AII Buffer Pool 24 is annotated sour valve 17 with the AII pond respectively and formed loop with AII pond reverse flow valve 18; B1 Buffer Pool 25 and BI Buffer Pool 26 are arranged in the Buffer Pool B, and BI Buffer Pool 25 is annotated sour valve 19 with the BI pond respectively and is formed loop with BI pond reverse flow valve 20, and BII Buffer Pool 26 is annotated sour valve 21 with the BII pond respectively and formed loop with BII pond reverse flow valve 22.

AI Buffer Pool liquid level sensor 27 is installed in the AI Buffer Pool 23; AII Buffer Pool liquid level sensor 28 is installed in the AII Buffer Pool 24; BI Buffer Pool liquid level sensor 29 is installed in the BI Buffer Pool 25, and BII Buffer Pool liquid level sensor 30 is installed in the BII Buffer Pool 26.Buffer Pool A is connected with acid jar 2 respectively with B; Buffer Pool A and B are connected to first static mixer 8 and second static mixer 7 through pipeline and reverse flow valve 14; At second static mixer 7 and first static mixer, 8 rear ends the one pH transmitter 9 and the 2nd pH transmitter 10 are installed respectively; Two parallel connections, first volume pump 11 and second volume pump 12 are arranged between second static mixer 7 and first static mixer 8; First volume pump 11 and second volume pump 12 are connected to the alkali jar; Second static mixer 7 and first lift pump 3, second lift pump 4, the 3rd lift pump 5, the 4th lift pump 6 are connected, and first lift pump 3, second lift pump 4 are connected with AII Buffer Pool 24 with AI Buffer Pool 23 respectively, and the 3rd lift pump 5, the 4th lift pump 6 are connected with BII Buffer Pool 26 with BI Buffer Pool 25 respectively.At second static mixer 8 and the 2nd pH transmitter 10 backs bleed valve 13 is installed.Simulating signal input AI is connected with each transmitter respectively in the Central Control Room control; Simulating signal is exported AO, is connected with each lift pump, volume pump respectively; Numerary signal output DO is connected with each valve respectively; PLC 31 sends sensor signal to negative and positive bed regenerated sewage control station 32, passes back to PLC 31 (PLC can replace with DCS) through controlling the output signal again after 32 analytical calculations of negative and positive bed regenerated sewage control station.

Implementation and operation:

One, there are acid, alkali both sexes sewage in the pond, can realize a dosing of sewage discharging according to following operation steps:

Negative and positive bed sewage is opened reverse flow valve 14 earlier and is closed bleed valve 13 after injecting Buffer Pool A and Buffer Pool B

According to the acid-basicity of sewage in the Buffer Pool, the lift pump startup of alkaline sewage and sour water is cut APC-control with the dosing loop then.

According to pH transmitter 9 detected pH values, the frequency of adjustment institute unlatching lift pump is adjusted to the volume pump limit of power with the sewage pH value in the static mixer 7; According to pH transmitter 10 detected pH values, divide the alkali lye output of process control volume pump 11 and volume pump 12, alkali lye is injected static mixer 8;, allow compliance with emission standards is then opened bleed valve 13, and closing volume valve 14 discharges; Otherwise close bleed valve 13, open reverse flow valve 14 and reflux.

In discharge process, need buffering if any regenerated sewage; Can be according to Buffer Pool sewage acid-basicity with certain lift pump as the homophony operand; The premix loop is beaten automatically, regulated this lift pump frequency conversion, be equivalent to fix the pH value in premix loop; Use the interior sewage of Buffer Pool to carry out self-neutralization as far as possible, reach the purpose of practicing thrift alkali lye.

Can reach in the scope in the volume pump ability, can start many lift pumps, strengthen quantity discharged.

Two, only have sour water in the pond, can realize a dosing of sewage discharging according to following operation steps: open reverse flow valve 14 and close bleed valve 13, the lift pump of sour water starts, and APC is cut in the dosing loop

-control.According to the acid-basicity of sewage in the Buffer Pool, adjustment lift pump frequency is adjusted to the volume pump limit of power with the sewage pH value in the static mixer 7; According to pH transmitter 9 detected pH values, divide the alkali lye output of process control volume pump 11 and volume pump 12, alkali lye is injected static mixer 8; According to pH transmitter 10 detected pH values, allow compliance with emission standards is then opened bleed valve 13, and closing volume valve 14 discharges; Otherwise close bleed valve 13, open reverse flow valve 14 and reflux.

This discharge process should be paid the utmost attention to the acid more weak interior sewage discharge of Buffer Pool, to obtain the purpose that strengthens quantity discharged.

Three, only there is alkaline sewage in the pond, according to following operation:

In the Buffer Pool of preparing sewage effluent, add certain acid solution, open reverse flow valve 14 and close bleed valve 13

Starting lift pump circulates.When the pH value of pH transmitter 10 reaches emission standard, open bleed valve 13 closing volume valves 14 and discharge.

Claims

1. negative and positive bed regenerated sewage is handled the pH system; Comprise: control part, Central Control Room, negative and positive bed regenerated sewage control station, power distribution station before negative and positive bed regenerated sewage is handled; It is characterized in that: control part before negative and positive bed regenerated sewage is handled; Constitute by alkali jar, acid jar, lift pump, static mixer, pH transmitter, volume pump, bleed valve, reverse flow valve, Buffer Pool A, Buffer Pool B, liquid level sensor; AI Buffer Pool (23) and AII Buffer Pool (24) are arranged in the described Buffer Pool A; AI Buffer Pool (23) annotates sour valve (15) with the AI pond respectively and AI pond reverse flow valve (16) forms loop, and AII Buffer Pool (24) annotates sour valve (17) with the AII pond respectively and AII pond reverse flow valve (18) forms loop; BI Buffer Pool (25) and BII Buffer Pool (26) are arranged in the Buffer Pool B; BI Buffer Pool (25) annotates sour valve (19) with the BI pond respectively and BI pond reverse flow valve (20) forms loop, and BII Buffer Pool (26) annotates sour valve (21) with the BII pond respectively and BII pond reverse flow valve (22) forms loop;

AI Buffer Pool liquid level sensor (27) is installed in the AI Buffer Pool (23); AII Buffer Pool liquid level sensor (28) is installed in the AII Buffer Pool (24); BI Buffer Pool liquid level sensor (29) is installed in the BI Buffer Pool (25), and BII Buffer Pool liquid level sensor (30) is installed in the BII Buffer Pool (26); Buffer Pool A is connected with acid jar (2) respectively with Buffer Pool B; Buffer Pool A is connected reverse flow valve (14) with Buffer Pool B through pipeline and connects first static mixer (8) and second static mixer (7) again, at second static mixer (7) and first static mixer (8) rear end the one pH transmitter (9) and the 2nd pH transmitter (10) is installed respectively; Two parallel connection first volume pumps (11) and second volume pump (12) are arranged between second static mixer (7) and first static mixer (8), and first volume pump (11) and second volume pump (12) are connected to the alkali jar; Second static mixer (7) is connected with first lift pump (3), second lift pump (4), the 3rd lift pump (5), the 4th lift pump (6); First lift pump (3), second lift pump (4) are connected with AII Buffer Pool (24) with AI Buffer Pool (23) respectively, and the 3rd lift pump (5), the 4th lift pump (6) are connected with BII Buffer Pool (26) with BI Buffer Pool (25) respectively; At first static mixer (8) and the 2nd pH transmitter (10) one sides bleed valve (13) is installed;

Simulating signal input AI is connected with each transmitter respectively in the Central Control Room control; Simulating signal is exported AO, is connected with each lift pump, volume pump respectively; Numerary signal output DO is connected with each valve respectively; PLC (31) sends sensor signal to negative and positive bed regenerated sewage control station (32), passes back to PLC (31) through controlling the output signal after negative and positive bed regenerated sewage control stations (32) analytical calculation again.