CN100357195C - Automatic controlling method and controller for treating urban waste water by suspending filler bed - Google Patents
Automatic controlling method and controller for treating urban waste water by suspending filler bed Download PDFInfo
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- CN100357195C CN100357195C CNB2004100249078A CN200410024907A CN100357195C CN 100357195 C CN100357195 C CN 100357195C CN B2004100249078 A CNB2004100249078 A CN B2004100249078A CN 200410024907 A CN200410024907 A CN 200410024907A CN 100357195 C CN100357195 C CN 100357195C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The present invention belongs to the technical field of environmental protection, more specifically an automatic control method and a device thereof for treating urban sewage by a suspended filler bed. The present invention uses a PC to on-line monitor and control the working process of the device for treating urban sewage by a suspended filler bed and a programmable controller in the PC executes the operational instruction of a system and collects and stores the technological parameters of the system. Compared with on-line monitoring data indicated by a digital quantity input module, a digital quantity output module and an analog quantity output module send out instructions to regulate the opening degree of an aerating system and sludge returning quantity so as to control the dissolved oxygen concentration, the ammoniacal nitrogen concentration and the total nitrogen concentration of the sewage if the on-line monitoring data exceeds an upper critical limit value and a lower critical limit value. The working process of the present invention is a dynamic process and can accurately make a judgement according to water quality in time so that the present invention has the advantages of automatic working condition operation control, low aerating quantity, low operation cost, good stable state maintenance among microbes in the suspended filler bed and stable system operation.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of autocontrol method and device thereof of suspended packing bed Treating Municipal Sewage.
Technical background
Along with the continuous increase of global population, the continuous progress of society, the acceleration of urbanization process, the municipal effluent amount sharply increases.Be effectively control water pollution, China has formulated more strict sewage drainage standard, and ammonia nitrogen is listed daily Monitoring and Controlling index in.The technical process of handling ammonia nitrogen is a lot, mainly contains A
2/ O technology, SBR technology and Phostrip technology etc., the common feature of these technologies is that floor space is big, is to improve hydraulic detention time to strengthen the reaction tank volume thereby consider during ammonia nitrogen removal more, and less about the autocontrol method of removing ammonia nitrogen.
The floating stuffing biological reactor is a kind of new apposition growth type biofilm reactor of studying both at home and abroad in recent years, its core is that a kind of particular fillers can keep suspended state in reactor, in the process that microorganism grows on filling surface, filler is an abundant fluidisation in water, to keep microorganism be fully utilized dissolved oxygen and good mass transfer condition, ammonia nitrogen is oxidized to nitric nitrogen, and part nitric nitrogen denitrification is converted into nitrogen, finishes denitrification process.Although domestic technology operation to suspended packing bed has been carried out more research with control, still there are many problems, be the difficult point during suspended packing bed is used always.Mainly have following problem: (1) is difficult to guarantee that filler is in abundant fluidized state; (2) system can not realize on-line monitoring according to water outlet, in time adjusts operation condition, is difficult to guarantee stable water outlet; (3) biomembranous microbe species on the filler can not be controlled, simple target control can only be realized; (4) because controlled variable is many, system's control is complicated; (5) system's capacity of resisting impact load is poor.
Summary of the invention
Thereby the objective of the invention is to propose a kind of easy and simple to handle, feedback rapidly, save the autocontrol method and the device thereof of working cost, the suspended packing bed Treating Municipal Sewage by regulating the aeration rate control dissolved oxygen concentration in the suspended packing bed.
The autocontrol method of the suspended packing bed Treating Municipal Sewage that the present invention proposes, be to utilize PC that the working process of suspended packing bed Treating Municipal Sewage device is carried out on-line monitoring and control, wherein, programmable controller executive system operational order in the PC, collect, stores system parameters oxygen concentration of ordinary dissolution, nitrogen Inlet and outlet water concentration, total nitrogen concentration, compare with the online monitoring data that shows from digital quantity input module, if online monitoring data surpass its critical on, lower value, digital quantity then, analog output module sends instruction, regulate the open degree and the mud quantity of reflux of aerating system, thus control dissolution of contaminated water oxygen concn, ammonia nitrogen concentration, total nitrogen concentration.
The present invention utilizes the suspended packing bed Treating Municipal Sewage, removes ammonia nitrogen or total nitrogen in the sewage.Sewage pumps into suspended packing bed from inlet chest, and aeration tube is arranged at the bottom of bed of packings, and aeration makes filler form fluidized in bed of packings, realize oxygenation and keep system's water quality even, hydraulic detention time 2--6 hour.Water outlet is drained through the settling tank post precipitation.Inlet chest of the present invention is laid liquidometer, adopts low alarm, prevents intake pump idle running.Feed-water end has been equipped with online ammonia nitrogen monitor, the variation of reflection influent ammonium concentration.Equip magnetic flow meter on the water inlet pipe, the control flooding velocity.Online dissolved oxygen meter and online BioChem ammonia nitrogen and online NO have been laid at the end outlet of suspended packing bed
x-N monitor, dissolved oxygen concentration, ammonia nitrogen and the nitric nitrogen concentration of monitoring water outlet.Laid magnetic flow meter control quantity of reflux on the mud return line, to realize the total nitrogen controlled target.
Among the present invention, be controlled target, the bound warning concentration of online dissolved oxygen meter and online ammonia nitrogen monitor is set with ammonia nitrogen Inlet and outlet water concentration.The upper limit concentration value of online dissolved oxygen meter is that 2--10mg/L, least concentration value are 0.0-0.5mg/L; Online ammonia nitrogen monitor water inlet upper limit concentration value is that 50--80mg/L, least concentration value are 0--15mg/L; Online ammonia nitrogen monitor water outlet upper limit concentration value is that 0--15mg/L, least concentration value are 0-3mg/L.Intake pump pumps into suspended packing bed with sewage, aerating system is by the boring aeration pipe aeration of suspended packing bed bottom, in suspended packing bed, make filler be in fluidized, realize the transmission of oxygen between the gas-liquid simultaneously, the variation of dissolved oxygen in the online dissolved oxygen meter monitoring bed of packings.In the scope of certain flooding velocity, regulate aerating system stopping valve open degree according to the ammonia nitrogen concentration of Inlet and outlet water on-line monitoring instrument monitoring, the dissolved oxygen concentration in the control suspended packing bed reaches the target of controlling the ammonia nitrogen oxidising process.The higher limit that is higher than the ammonia nitrogen water outlet of default as the water outlet ammonia nitrogen concentration, then regulate the open degree of aeration stopping valve, each 10--50% that increases, at interval after 30--90 minute, judge once more according to the water outlet ammonia nitrogen concentration, still exceed the capping value as the water outlet ammonia nitrogen concentration, then continue to increase the open degree 10--50% of aeration stopping valve, so circulation.The dissolved oxygen concentration that monitors system when online dissolved oxygen meter exceeds the dissolved oxygen upper limit concentration of default, and then Controlling System provides the warning of " system's ammonia nitrogen loading is too high ".Utilize methods such as increasing mud quantity of reflux or dilution influent ammonium concentration to control the interior ammonia nitrogen loading of suspended packing bed.If the water outlet ammonia nitrogen concentration is lower than the lower limit of the water outlet ammonia nitrogen concentration of setting, the then corresponding open degree that reduces the aeration stopping valve reduces 10--50% at every turn, and adjusting the timed interval is 30--90 minute, and monitoring is judged once more.If dissolved oxygen concentration is lower than the lower value of default, then stop to reduce aeration rate, provide the warning of " system's ammonia nitrogen loading is low excessively ", can consider to increase system's ammonia nitrogen loading.Therefore the oneself by system program judges, dynamically adjusts the relation between aeration rate and the water outlet ammonia nitrogen, realizes process optimization, saves running cost.
Among the present invention, be controlled target, under certain flooding velocity situation, set dissolved oxygen, mixed solution ammonia nitrogen, the isocyatic upper limit value and lower limit value of mixed solution nitric nitrogen, set the upper limit value and lower limit value of aerating regulation opening of valves degree with the total nitrogen.Dissolved oxygen on-line monitoring instrument upper limit concentration value is set at 2-10mg/L, and the least concentration value is set at 0--1mg/L; Ammonia nitrogen on-line monitoring instrument water inlet upper limit concentration value is that 50--80mg/L, least concentration value are 0--15mg/L; Ammonia nitrogen on-line monitoring instrument water outlet upper limit concentration value is that 0--15mg/L, least concentration value are respectively 0--3g/L; Water outlet nitric nitrogen on-line monitoring instrument upper limit concentration value is that 30--50mg/L, least concentration value are 0-5mg/L.Microbial film in the suspended packing bed on the filler has the function of nitrification and denitrification simultaneously, and dissolved oxygen concentration is the process that 1～2mg/L can realize nitrification and denitrification in the biomembrance process control mixed solution.After water inlet pumps into suspended packing bed, utilize the perforated pipe aerating regulation system to finish the oxygenation process, realize automatic control the water outlet total nitrogen according to dissolved oxygen concentration, ammonia nitrogen concentration and the nitric nitrogen concentration of mixed solution.If the ammonia nitrogen concentration of mixed solution exceeds the higher limit of setting, the concentration of mixed solution nitric nitrogen is higher than the higher limit of default, the concentration of mixed solution dissolved oxygen is lower than the higher limit of default, then can increase the open degree of aerating regulation valve 10--50%, strengthen the mud quantity of reflux simultaneously, increase 10-40% at every turn.If the mixed solution ammonia nitrogen concentration exceeds the higher limit of default, the concentration of mixed solution nitric nitrogen is lower than the higher limit of default, dissolved oxygen concentration is lower than the higher limit of default, then can improve the open degree of aerating regulation valve 10--50%, and keeps the mud quantity of reflux constant.Therefore, technological principle according to the while nitration denitrification, utilize on-line monitoring Instrument measuring mixed solution ammonia nitrogen, nitric nitrogen and dissolved oxygen concentration, the total 6--10 kind of system is controlled judgment mode automatically, finishes automatic control to the suspended packing bed treatment system by regulating aerating system aeration rate and mud quantity of reflux.
The automatic control device of the suspended packing bed Treating Municipal Sewage that the present invention proposes, form by the programmable controller in floating stuffing bed bioreactor, the PC 11, signaling module, it is characterized in that signaling module is made up of digital quantity input module 10 and digital quantity, analog output module 12, digital quantity input module 10, programmable controller 11 and digital quantity, analog output module 12 are connected successively; The bottom of floating stuffing bed bioreactor is provided with aeration tube, one end of floating stuffing bed bioreactor connects inlet chest, the inlet chest place is provided with liquidometer 4, adopt low alarm, prevent intake pump idle running, the feed-water end place is provided with ammonia nitrogen on-line monitoring instrument 6, flooding velocity meter 1, the control flooding velocity, and the end outlet place of floating stuffing bed bioreactor is provided with the online dissolved oxygen meter 5 of dissolved oxygen, online ammonia nitrogen monitor 6, online nitric nitrogen monitor 7; Digital quantity input module 10 is connected with flooding velocity meter 1, aerating system stopping valve 3, mud return flow meter 2, inlet chest liquidometer 4, online dissolved oxygen meter 5, online ammonia nitrogen monitor 6, online nitric nitrogen monitor 7 respectively; Digital quantity, analog output module 12 are connected with intake pump 8, reflux pump 9, aeration stopping valve 3 respectively.
The programmable logic controller that the present invention uses is commercially available, and as adopting SIMATIC S7-300, digital quantity input module is commercially available, and as adopting SM321, digital quantity, analog output module are commercially available, as adopting SM322.
Working process of the present invention is a dynamic process, can be in time, judge according to the water quality situation exactly, both helped automatic control work condition operation, reduce aeration rate, save running cost, can make again between the kind of the microorganism in the suspended packing bed and remain on a satisfactory stability state, guarantee system stable operation.
The comparison sheet of the present invention and traditional floating stuffing bed process
| Feature | The present invention | The tradition suspended packing bed |
| The control processing target | Plurality of target | Simple target |
| Controllability to system | Automatically control by force, | Weak, manual regulation |
| Operating Complexity | Simply, flexibly | Complicated |
| Running cost | Save 40% | Standard |
| Remove the ammonia nitrogen ability | Stable | More stable |
| Remove the total nitrogen ability | Stable | A little less than |
| The ability of anti-shock loading | By force | A little less than |
| To the system feedback ability | In time, by force | A little less than |
Description of drawings
Fig. 1 is an automatic control system schema of the present invention.
Number in the figure: 1 is the flooding velocity meter, and 2 is the return flow meter, and 3 is the aeration stopping valve, 4 is liquidometer, 5 is online dissolved oxygen meter, and 6 is online ammonia nitrogen monitor, and 7 is online nitric nitrogen monitor, 8 is intake pump, 9 is reflux pump, and 10 is digital quantity input module, and 11 is programmable manipulator, 12 is digital quantity, analog output module, and 13 is PC.
Embodiment
Embodiment 1
This Controlling System adopts SIMATIC S7-300 programmable controller, and central processing unit is CPU315, and digital quantity input module adopts SM321, and digital quantity, analog output module adopt SM322.Certain municipal effluent is pumped into suspended packing bed, and system is a controlled target with the ammonia nitrogen in the control water outlet.The sewage influent ammonium concentration is 31.3mg/L, aeration stopping valve open degree is 30--40%, dissolved oxygen concentration is 1.9mg/L in the suspended packing bed, after the suspended packing bed biological treatment, ammonia nitrogen on-line monitoring instrument test water outlet ammonia nitrogen concentration is 11--18mg/L, greater than the higher limit of default water outlet ammonia nitrogen concentration 10--15mg/L.Automatic control system increases the open degree of stopping valve according to the sequence of control of setting, be adjusted into 30--50%, behind the 30--90min, dissolved oxygen concentration is 2.2mg/L in the online dissolved oxygen meter monitoring suspended packing bed, online ammonia nitrogen monitor test ammonia nitrogen concentration is 8.5--10mg/L, higher limit less than water outlet ammonia nitrogen concentration 10--15mg/L, aeration rate remains unchanged, to monitor the water outlet ammonia nitrogen concentration be 8.2mg/L to online ammonia nitrogen monitor behind the 30--90min, and online dissolved oxygen meter test dissolved oxygen concentration is 2.3mg/L.Illustrative system is stable.
This Controlling System adopts SIMATIC S7-300 programmable controller, and central processing unit is CPU315, and digital quantity input module adopts SM321, and digital quantity, analog output module adopt SM322.Certain municipal effluent is pumped into suspended packing bed, and system is a controlled target with the ammonia nitrogen in the control water outlet.The sewage influent ammonium concentration is 52.1mg/L, and aeration stopping valve open degree is 40--70%, and dissolved oxygen concentration is 2.0mg/L in the suspended packing bed, and the water outlet ammonia nitrogen concentration is 15--20mg/L.System provides guard signal according to influent ammonium concentration: " system's ammonia nitrogen loading is higher ".Automatically regulate aeration stopping valve open degree simultaneously, heighten 60--80%, the on-line monitoring instrument is monitored the water outlet ammonia nitrogen automatically behind the 30--90min, dissolved oxygen concentration is respectively 13--16g/L, 2.7mg/L.The water outlet ammonia nitrogen concentration still exceeds default upper limit concentration, and aeration stopping valve open valve is adjusted to 70--90% automatically, monitoring water outlet ammonia nitrogen and dissolved oxygen concentration difference 10.5mg/L and 3.4mg/L behind the 30--90min.Transfer the big 80--90% of arriving when aeration stopping valve open degree, the water outlet ammonia nitrogen concentration is 8.8mg/L, and the water outlet dissolved oxygen concentration is 4.2mg/L.System provides warning: " dissolved oxygen concentration exceeds upper limit concentration ".System reduces the aeration open valve automatically, adjusts aeration rate, realizes the running balance of water outlet ammonia nitrogen concentration and water outlet dissolved oxygen concentration.
This Controlling System adopts SIMATIC S7-300 programmable controller, and central processing unit is CPU315, and digital quantity input module adopts SM321, and digital quantity, analog output module adopt SM322.Certain municipal effluent is pumped into suspended packing bed, and system is a controlled target with control water outlet total nitrogen.The sewage influent ammonium concentration is 30.4mg/L, and nitric nitrogen concentration is 0.05mg/L.After the suspended packing bed Biostatic was handled, suspended packing bed water outlet ammonia nitrogen concentration was 13--15mg/L, and nitric nitrogen concentration is 1.5--5mg/L, and dissolved oxygen concentration is 1.2--3mg/L, and aeration stopping valve open degree is 20--40%.Automatic control system judges according to the criterion of writing, the water outlet ammonia nitrogen concentration is greater than the upper limit concentration of default, and therefore nitric nitrogen and dissolved oxygen concentration increase system's aeration rate in the concentration range of setting, aeration stopping valve open degree is increased to 30--50%, and keep the mud quantity of reflux constant.Through 30--90min, it is 11--13mg/L that on-line instrument is measured the water outlet ammonia nitrogen concentration, and nitric nitrogen concentration is 1.5--4mg/L, dissolved oxygen concentration 1.6mg/L, system adjusts operation condition once more, and aeration stopping valve open degree increases to 40--60%, and the mud quantity of reflux is constant.Behind the 30--90min, on-line instrument is monitored out water concentration, and ammonia nitrogen concentration is 8--10mg/L, and nitric nitrogen concentration is 2.1mg/L, and dissolved oxygen is 2.0mg/L.After system adjusts to water outlet ammonia nitrogen, nitric nitrogen and dissolved oxygen three concentration in the scope of setting, keep operation condition, as occur to surpass the upper limit among ammonia nitrogen, nitric nitrogen and the dissolved oxygen three in the water outlet or be lower than lower limit then system provide judgement again, control automatically.
Claims (2)
1, a kind of autocontrol method of suspended packing bed Treating Municipal Sewage, it is characterized in that utilizing PC that the working process of suspended packing bed Treating Municipal Sewage device is carried out on-line monitoring and control, wherein, programmable controller executive system operational order in the PC, collect, stores system parameters oxygen concentration of ordinary dissolution, nitrogen Inlet and outlet water concentration, total nitrogen concentration, compare with the online monitoring data that shows from digital quantity input module, if online monitoring data surpass its critical on, lower value, digital quantity then, analog output module sends instruction, regulate the open degree and the mud quantity of reflux of aerating system, thus control dissolution of contaminated water oxygen concn, ammonia nitrogen concentration, total nitrogen concentration; Wherein:
With ammonia nitrogen Inlet and outlet water concentration is controlled target, and the upper limit of concentration value of online dissolved oxygen meter is 10mg/L, and lower value is 0; Online ammonia nitrogen monitor water inlet higher limit is 80mg/L, and lower value is 0; Online ammonia nitrogen monitor water outlet higher limit is 15mg/L, and lower value is 0; Adjust the open degree of aeration stopping valve according to ammonia nitrogen Inlet and outlet water concentration, the higher limit that is higher than the ammonia nitrogen water outlet of default as the water outlet ammonia nitrogen concentration, then regulate the open degree of aeration stopping valve, each 10--50% that increases, after 30--90 minute, judge once more at interval, still exceed the capping value as the water outlet ammonia nitrogen concentration according to the water outlet ammonia nitrogen concentration, then continue to increase the open degree 10--50% of aeration stopping valve, so circulation; If the water outlet ammonia nitrogen concentration is lower than the lower limit of the water outlet ammonia nitrogen concentration of setting, the then corresponding open degree that reduces the aeration stopping valve reduces 10--50% at every turn, and adjusting the timed interval is 30--90 minute, and according to the water outlet ammonia nitrogen concentration, monitoring is judged once more;
With the total nitrogen is controlled target, and the upper limit of concentration value of online dissolved oxygen meter is 10mg/L, and lower value is 0; Online ammonia nitrogen monitor influent concentration higher limit is 80mg/L, and lower value is 0; Online ammonia nitrogen monitor water outlet upper limit of concentration value is 15mg/L, and lower value is 0; Online nitric nitrogen monitor water outlet upper limit of concentration value is 50mg/L, and lower value is 0; If the ammonia nitrogen concentration of mixed solution exceeds the higher limit of setting, the concentration of mixed solution nitric nitrogen is higher than the higher limit of setting, the concentration of dissolved oxygen is lower than the higher limit of setting, then increases the open degree 10--50% of aerating regulation valve, and the mud quantity of reflux is each 10-40% of increasing; If the ammonia nitrogen concentration of mixed solution exceeds the higher limit of default, the concentration of mixed solution nitric nitrogen is lower than the higher limit of default, and dissolved oxygen concentration is lower than the higher limit of default, improves aerating regulation opening of valves degree 10--50%, and the mud quantity of reflux remains unchanged.
2, a kind of implement device of autocontrol method of suspended packing bed Treating Municipal Sewage as claimed in claim 1, form by programmable controller (11), signaling module in floating stuffing bed bioreactor, the PC (13), it is characterized in that signaling module is made up of digital quantity input module (10) and digital quantity, analog output module (12), digital quantity input module (10), programmable controller (11) and digital quantity, analog output module (12) are connected successively; The bottom of floating stuffing bed bioreactor is provided with aeration tube, one end of floating stuffing bed bioreactor connects inlet chest, the inlet chest place is provided with liquidometer (4), adopt low alarm, prevent intake pump idle running, the feed-water end place is provided with online ammonia nitrogen monitor (6), flooding velocity meter (1), and the end outlet place of floating stuffing bed bioreactor is provided with online dissolved oxygen meter (5), online ammonia nitrogen monitor (6), online nitric nitrogen monitor (7); Digital quantity input module (10) is connected with flooding velocity meter (1), aerating system stopping valve (3), mud return flow meter (2), inlet chest liquidometer (4), online dissolved oxygen meter (5), online ammonia nitrogen monitor (6), online nitric nitrogen monitor (7) respectively; Digital quantity, analog output module (12) are connected with intake pump (8), reflux pump (9), aeration stopping valve (3) respectively.
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| CNB2004100249078A CN100357195C (en) | 2004-06-03 | 2004-06-03 | Automatic controlling method and controller for treating urban waste water by suspending filler bed |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319875C (en) * | 2005-08-12 | 2007-06-06 | 上海昊沧系统控制技术有限责任公司 | On-line control method for aeration quantity in sewage biological treatment technique |
| CN100506720C (en) * | 2008-02-22 | 2009-07-01 | 清华大学 | Urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device |
| CN103508556A (en) * | 2013-10-28 | 2014-01-15 | 上海纯元环保科技有限公司 | Aeration capacity regulating system for aerobic sewage treatment |
| CN104155928A (en) * | 2014-06-24 | 2014-11-19 | 北京沃洋洲环保装备有限公司 | Operation control method for sewage treatment |
| CN110850803A (en) * | 2019-12-06 | 2020-02-28 | 苏州农业职业技术学院 | Automatic feeding control circuit of intelligent floating bed and water quality adjusting method thereof |
| CN112174323A (en) * | 2020-09-29 | 2021-01-05 | 昆山润淞环保科技有限公司 | Wastewater biomembrane microbubble oxygenation type high-rate trickling filtration treatment tower and process |
| CN112624320B (en) * | 2020-12-04 | 2023-04-07 | 浙江浙能技术研究院有限公司 | High-salt high-ammonia nitrogen regeneration wastewater treatment system and control strategy |
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| US5248423A (en) * | 1991-02-11 | 1993-09-28 | Degremont | Process for the regulation of a device for the removal of pollutants from waste water |
| CN1205982A (en) * | 1997-07-17 | 1999-01-27 | 济南元首针织股份有限公司 | Waste liquid recovering and regenerating device |
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| CN1424267A (en) * | 2003-01-09 | 2003-06-18 | 同济大学 | Chemicobiological flocculation treating method for urban sewage with suspending packing bed |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5248423A (en) * | 1991-02-11 | 1993-09-28 | Degremont | Process for the regulation of a device for the removal of pollutants from waste water |
| CN1205982A (en) * | 1997-07-17 | 1999-01-27 | 济南元首针织股份有限公司 | Waste liquid recovering and regenerating device |
| CN1331054A (en) * | 2000-06-29 | 2002-01-16 | 上海理日申能环境工程有限公司 | Intermittent automatic process and equipment for treating waste water |
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