CN102815788B - Emergency regulation method for treating water quality impact of abnormal inlet water by using CASS (cyclic activated sludge system) process - Google Patents
Emergency regulation method for treating water quality impact of abnormal inlet water by using CASS (cyclic activated sludge system) process Download PDFInfo
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- CN102815788B CN102815788B CN201210333726.8A CN201210333726A CN102815788B CN 102815788 B CN102815788 B CN 102815788B CN 201210333726 A CN201210333726 A CN 201210333726A CN 102815788 B CN102815788 B CN 102815788B
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Abstract
The invention provides an emergency regulation method for treating water quality impact of abnormal inlet water by using a CASS (cyclic activated sludge system) process. The emergency regulation method comprises the following steps: determining whether a CASS reaction tank is about to be impacted by the abnormal inlet water according to on-line detection of a total water inlet installed on a CASS process sewage treatment plant; if detecting that the abnormal inlet water enters the CASS reaction tank in a certain time interval, adjusting the CASS reaction tank in or about to enter the water inlet stage to realize the lowest water filling ratio (f) and the highest sludge return ratio (R) according to the water inlet flow so as to create the maximum buffering capacity; controlling time allocation and corresponding dissolved oxygen concentration levels of four stages of water inlet, aeration, sediment and water decantation of the CASS reaction tank in or about to enter the water inlet stage in an operation cycle according to the water quality characteristics of the abnormal inlet water; and if the circumstances are normal, operating according to a normal mode. By utilizing the emergency regulation method, a CASS process operation method is regulated, equipment does not need to be changed, and the emergency regulation method has the characteristic of practicability.
Description
Technical field
The present invention relates to technical field of sewage, be specifically related to a kind of cyclic activated sludge system and tackle the emergent regulate and control method that abnormal influent quality impacts.
Background technology
CASS (Cyclic Activated Sludge System) technique is a kind of form of circulating active sludge technology, be in sequence batch (aeration-non-aeration mode, move fill-put intermittently active sludge treatment process of formula.The basic structure of CASS is: on the basis of sequencing batch active sludge (SBR), reaction tank is designed to two portions along pond length direction, front portion is Ye Cheng pre-reaction zone, biological selecting area, and rear portion is that liftable automatic slash water device has been installed at rear portion, ，Qi main reaction region, main reaction region.The processes such as the aeration of whole technique, precipitation, draining are loop cycle operation in same pond, has saved second pond and the sludge reflux system of conventional activated sludge method; Can intake continuously, be interrupted draining simultaneously.Cyclic activated sludge system integrates reaction, precipitation, draining, function, and the degraded of pollutent is plug-flow process in time, microorganism among aerobic, anoxic, anaerobism periodical change, thereby reach pollutant removal effect.
The domestic exploratory development major part to cyclic activated sludge system concentrates on the control of technological design, parameter optimization, a certain detailed process and installs the aspects such as improvement, as process controller and the method for the subsection water-feeding deep denitrogenation of CN200810227685.8 proposition, mainly for how effectively utilizing water-inlet carbon source to reach better denitrification effect; CN200710177458.4 has proposed the real-time control method of strengthening circulating active sludge method denitrogenation.The method of above patent announcement emphasizes to rely on on-line instrument to catch suitable check point more, does not all relate to the method that abnormal Sewage shock is processed.
It is some water-quality guideline concentration short period of time into water significantly to surpass the situation of its design load that abnormal influent quality impacts.Fast development along with city, municipal effluent water drain pipe network service area also increases thereupon fast, its management difficulty also increases gradually simultaneously, because the sewage treatment facility of some industrial enterprise self is not normally moved or arranges steathily trade effluent in violation of rules and regulations, cause having received and not reached in a large number the trade effluent that < < sewage enters municipal sewage system water quality standard > > (CJ343-2010) in city planting ductwork.The relative sanitary sewage of these amount of industrial wastewater is less, but conventionally there is higher organism or total nitrogen concentration, and instantaneous delivery is large when entering municipal sewage system, thereby cause that to enter the combined sewage variation water quality of municipal wastewater treatment plant larger, even form the water quality impact that significantly surpasses design water inlet value, had a strong impact on the normal operation of sewage work.Cyclic activated sludge system is one of typical process of municipal sewage treatment, but the emergent regulation and control that conventional cyclic activated sludge system operational mode does not relate to abnormal influent quality while impacting process, and lacks handiness, thereby must bring impact to the stably reaching standard of sewage discharge.
Summary of the invention
For prior art above shortcomings, the object of the invention is to solve existing cyclic activated sludge system can not emergency processing high-enriched organics sewage or the impact of high density nitric wastewater, causing abnormal water inlet to make the problem that sewage disposal can not stably reaching standard discharge, providing a kind of cyclic activated sludge system to tackle the emergent regulate and control method that abnormal influent quality impacts.
Solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of cyclic activated sludge system is tackled the emergent regulate and control method that abnormal influent quality impacts, and comprises the steps:
1) first, according to the on-line detector that is arranged on cyclic activated sludge system sewage work total water inlet, judge whether CASS reaction tank is about to be subject to the impact of abnormal water inlet, detect whether certain period has been about to high-enriched organics sewage or high density nitric wastewater flows into CASS reaction tank; Wherein, the CODcr that described high-enriched organics sewage is intake is 1.2-2.0 times of corresponding water-quality guideline design influent concentration, and the TN of high density nitric wastewater water inlet is 1.2-2.0 times of corresponding water-quality guideline design influent concentration;
2) if detect the abnormal water inlet of certain period high-enriched organics sewage or high density nitric wastewater, enter CASS reaction tank, according to flooding velocity adjustment the CASS reaction tank in being about to enter fill phase to achieved minimum water-filling than f and the highest return sludge ratio R, to build maximum surge capability; Wherein, return sludge ratio adjustable extent is 0-30%, and water-filling is 0.1-0.4 than adjustable extent; And perform step 3);
If normal conditions, does not have high-enriched organics sewage or high density nitric wastewater to flow into CASS reaction tank, press Design Mode operation, do not perform step 3);
3) according to water inlet on-line detector detection case, judgement is high-enriched organics sewage or high density nitric wastewater, to control this CASS reaction tank in being about to enter fill phase water inlet, aeration in the cycle of operation, precipitate and to strain the time of water four-stage, distributes and corresponding dissolved oxygen concentration level; Concrete regulation measure is as shown in the table:
Compared to existing technology, the present invention has following beneficial effect:
1, the present invention, according to the result of factorial experiment effect analysis, proposes to adjust water-filling than the overall adjustment thinking of (f) and return sludge ratio (R); Make full use of pH, ORP, DO, MLSS, COD, NH
3the on-line monitoring equipment such as-N and Portable water-quality analysis instrument device, for abnormal water inlet situation, the real-time control that relies on PLC Controlling System to feedover and feed back.
The characteristic (being high-enriched organics sewage or high density nitric wastewater) of 2, impacting based on water inlet and the conclusion of effect analysis, systematically proposed water inlet, aeration in the cycle of operation, precipitated and strained the concrete measure in the time distribution of water four-stage and these adjustment schemes of dissolved oxygen concentration level of correspondence.
3, the present invention only adjusts cyclic activated sludge system operation method, and water inlet is the production problem that sewage work generally faces to the interference of water outlet qualified discharge extremely, therefore the method that this invention proposes has very strong replicability, can in the Sewage Plant that adopts cyclic activated sludge system, promote; Do not need equipment to change, there is the feature of practicality.
To sum up, emergency operating pattern provided by the invention, can successfully manage that to be no more than 2 times of height to design load organic or/and the high impact containing nitrogen concentration, take variable intensity aeration as core, on the basis of effect analysis, rely on feedforward and Feedback to control effectively to regulate and control, changed original design single operation pattern, in length cycle time, in cycle, each phases-time distributes, aeration pattern and intensity, water-filling is adjusted for water inlet impact characteristics than aspects such as (f) and return sludge ratios (R), can make full use of and adjust water-filling than the surge capability of f and return sludge ratio R lifting CASS reaction tank, reduce water quality and impact the damaging influence to CASS reaction tank biosystem, adopt micro-aeration can in reaction tank, build good denitrification-nitrated environment with the pattern that full aeration combines, promote to greatest extent nitric efficiency.Can maximally utilise existing equipment and regulate and control, guarantee to press the cyclic activated sludge system sewage effluents stably reaching standard discharge of the one-level B standard design in < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002).
Accompanying drawing explanation
Fig. 1 is existing CASS system construction drawing;
Fig. 2 is CASS system architecture schematic diagram of the present invention;
Design Mode and contingency mode operating performance comparison diagram when Fig. 3 is high organism water inlet impact;
Design Mode and contingency mode operating performance comparison diagram when Fig. 4 is high nitrogenous thing water inlet impact.
Embodiment
Referring to Fig. 1, existing CASS system architecture is, in the front portion of reaction tank, is provided with biological selecting area, and rear portion is provided with the liftable water device of automatically straining.Its working process can be divided into aeration, precipitates, strains water, idle four-stage, and loop cycle is carried out.Sewage enters pre-reaction zone continuously, through partition wall bottom, enters main reaction region, is guaranteeing, under the condition of oxygen supply, to make organism by the microbiological deterioration in pond.According to influent quality, can adjust operating parameter.
Its CASS principle is: in pre-reaction zone, microorganism can be adsorbed rapidly most of dissolved organic matter in sewage by the fast transfer mechanism of enzyme, the matrix Rapid Accumulation process of a high loading of experience, this plays good shock absorption to influent quality, the water yield, potential of hydrogen and hazardous and noxious substances, hyphomycetic growth is played to restraining effect simultaneously, can effectively prevent sludge bulking; In main reaction region, experience subsequently one compared with the substrate degradation process of underload.Cyclic activated sludge system integrates reaction, precipitation, draining, function, the degraded of pollutent is plug-flow process in time, microorganism among aerobic, anoxic, anaerobism periodical change, thereby reach pollutant removal effect, also there is good denitrogenation, phosphorus removal functional simultaneously.
High-enriched organics sewage or high density nitric wastewater refer to that concentration significantly surpasses the sewage of design influent COD cr or TN concentration.Existing cyclic activated sludge system conventional operation pattern is difficult to tackle the impact of high-enriched organics sewage or the abnormal influent quality of high density nitric wastewater, the impact of bringing to sewage disposal stably reaching standard.
A kind of cyclic activated sludge system provided by the invention is tackled the emergent regulate and control method that abnormal influent quality impacts, and is to have proposed corresponding emergent regulation and control operational mode for high-enriched organics sewage or two kinds of water quality impacts of high density nitric wastewater water inlet.
Referring to Fig. 2, in CASS system architecture principle of the present invention,
1, ORP reading in oxygen-starved area can be used as the criterion whether denitrifying carbon source is sufficient;
2, according to influent COD and TN concentration, by variable frequency control, adjust return sludge ratio R(0-30%);
3, control MLSS be winter 5-6 g/L, all the other in period 3.5-4g/L;
4, by blower fan, open number of units, variable frequency control and online DO instrument and realize ladder aeration, build suitable DO value;
5, by straining water height control water-filling than f(0.1-0.4) control each cycle flooding quantity.
Cyclic activated sludge system of the present invention is tackled the emergent regulate and control method that abnormal influent quality impacts, and comprises the steps:
1) first, according to the on-line detector that is arranged on cyclic activated sludge system sewage work total water inlet, judge whether CASS reaction tank is about to be subject to the impact of abnormal water inlet, detect whether certain period has been about to high-enriched organics sewage or high density nitric wastewater flows into CASS reaction tank; Wherein, the CODcr that described high-enriched organics sewage is intake is 1.2-2.0 times of corresponding water-quality guideline design influent concentration, and the TN of high density nitric wastewater water inlet is 1.2-2.0 times of corresponding water-quality guideline design influent concentration;
2) if detect the abnormal water inlet of certain period high-enriched organics sewage or high density nitric wastewater, enter CASS reaction tank, according to flooding velocity adjustment the CASS reaction tank in being about to enter fill phase to achieved minimum water-filling than f and the highest return sludge ratio R, to build maximum surge capability; Wherein, return sludge ratio adjustable extent is 0-30%, and water-filling is 0.1-0.4 than adjustable extent; And perform step 3);
If normal conditions, does not have high-enriched organics sewage or high density nitric wastewater to flow into CASS reaction tank, press Design Mode operation, do not perform step 3);
3) according to water inlet on-line detector detection case, judgement is high-enriched organics sewage or high density nitric wastewater, to control this CASS reaction tank in being about to enter fill phase water inlet, aeration in the cycle of operation, precipitate and to strain the time of water four-stage, distributes and corresponding dissolved oxygen concentration level; Concrete regulation measure is as shown in the table:
For example, adopting processing power is 30m
3the pilot test device of/d, the settling pit water outlet of water inlet Wei Mou sewage work, sludge age (SRT) is 15 days, design organic loading 0.06-1.2 kgBOD
5/ kgMLSSd, return sludge ratio variable range 0-30%, water-filling is than variable range 0.1-0.4.Flow, dissolved oxygen (DO), redox potential (ORP), pH and ammonia nitrogen (NH have been configured
3-N) on-line detector, controls automatically by PLC system, and the means of regulation and control have return sludge ratio R, water-filling than f, aeration intensity and the working time in each stage of one-period.
The sewage that utilizes intake pump and configuration mixes with the water inlet of CASS reaction tank with simulation combined system pipe network heavy rain and season the impact of Sewage Plant, high-enriched organics sewage or high density nitric wastewater is impacted, flooding velocity, COD and NH that experiment employing is 2 times
3-N design load.As shown in Figure 3 and Figure 4, what compare with emergent regulation and control model is 4 hours operational modes (water inlet 1h+ aeration 1h+ precipitation 1h+ strains water 1h) of original design employing to the operation result obtaining by 5 groups of experiments.
(1) water inlet of high-enriched organics sewage is impacted:
Impacting under flow condition, adopting the emergent regulation and control model I of high-enriched organics sewage water inlet can guarantee that COD water outlet is up to standard, and with respect to original design pattern, influent concentration without significant difference (
p>0.5), go out water concentration there were significant differences (
p<0.01) and emergent regulation and control water outlet can reach one-level B standard, clearance increases to 93.3% from 86.5%, be significantly increased (
p<0.01).Contrast refers to accompanying drawing 3.
(2) water inlet of high density nitric wastewater is impacted:
Impacting under flow condition, adopting the emergent regulation and control model II of high density nitric wastewater water inlet can guarantee that TN water outlet is up to standard, and with respect to original design pattern, influent concentration without significant difference (
p>0.5), go out water concentration there were significant differences (
p<0.01) and emergent regulation and control water outlet can reach one-level B standard, clearance increases to 78.4% from 50.8%, be significantly increased (
p<0.01).Two kinds of operational modes have all been considered adding of carbon source (10% methyl alcohol), have adopted identical dosage.Contrast refers to Fig. 4.
The present invention is a kind of new regulate and control operation method, with dealing with the water inlet of fluctuation, to guarantee that the abnormal water inlet of the fluctuation within exceeding design influent quality certain limit still can be processed effectively, discharges after reaching one-level B standard.Under certain water inlet exception condition, adjust water-filling than (f) and the affect usefulness of return sludge ratio (R) on cyclic activated sludge system effluent quality.Water-filling is positive-effect than f to effluent quality, and less water-filling goes out water concentration than obtaining lower pollutent; Return sludge ratio R is negative effect for effluent quality, and higher return sludge ratio can obtain lower pollutent and go out water concentration.
In addition, the effect of water-filling ratio is better than return sludge ratio, top-priority control measures.But water-filling directly affects the processing water yield of cyclic activated sludge system Sewage Plant than (f), therefore need to determine the minimum water-filling ratio that each CASS pond can adopt when answering impact by feedforward flow information, then adopt maximum return sludge ratio (R), and the water quality characteristic (high-enriched organics sewage or high density nitric wastewater) of the water inlet impact feedovering based on water inlet on-line detector device determines water inlet, aeration in the water inlet cycle, precipitates and strains time distribution and the corresponding dissolved oxygen concentration level of water four-stage.
The present invention can be used for solving the regulation measure shortage specific aim that cyclic activated sludge system municipal wastewater treatment plant reply water inlet is impacted, could not make full use of the defect of the maximum efficiency of existing conventional control measures simultaneously, for this typical sewage treatment process of cyclic activated sludge system provides a kind of comprehensive emergent regulate and control method, solve the abnormal influent quality of existing cyclic activated sludge system sewage work and impact the impact that the steady running of sewage work is brought.
Claims (1)
1. cyclic activated sludge system is tackled the emergent regulate and control method that abnormal influent quality impacts, and comprises the steps:
1) first, according to the on-line detector that is arranged on cyclic activated sludge system sewage work total water inlet, judge whether CASS reaction tank is about to be subject to the impact of abnormal water inlet, detect whether certain period has been about to high-enriched organics sewage or high density nitric wastewater flows into CASS reaction tank; Wherein, the CODcr that described high-enriched organics sewage is intake is 1.2-2.0 times of corresponding water-quality guideline design influent concentration, and the TN of high density nitric wastewater water inlet is 1.2-2.0 times of corresponding water-quality guideline design influent concentration;
2) if detect the abnormal water inlet of certain period high-enriched organics sewage or high density nitric wastewater, enter CASS reaction tank, according to flooding velocity adjustment the CASS reaction tank in being about to enter fill phase to achieved minimum water-filling than f and the highest return sludge ratio R, to build maximum surge capability; Wherein, return sludge ratio adjustable extent is 0-30%, and water-filling is 0.1-0.4 than adjustable extent; And perform step 3);
If normal conditions, does not have high-enriched organics sewage or high density nitric wastewater to flow into CASS reaction tank, press Design Mode operation, do not perform step 3);
3) according to water inlet on-line detector detection case, judgement is high-enriched organics sewage or high density nitric wastewater, to control this CASS reaction tank in being about to enter fill phase water inlet, aeration in the cycle of operation, precipitate and to strain the time of water four-stage, distributes and corresponding dissolved oxygen concentration level; Concrete regulation measure is as shown in the table:
。
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| CN103864194B (en) * | 2014-04-01 | 2015-05-13 | 山东省环境保护科学研究设计院 | Emergency control method for sewage treatment system for treating abnormal influent/effluent quality |
| CN104150611B (en) * | 2014-08-28 | 2015-10-07 | 嘉诚环保工程有限公司 | The sewage water treatment method that a kind of town sewage plant reply trade effluent impacts |
| CN106830317A (en) * | 2017-02-21 | 2017-06-13 | 青岛思普润水处理股份有限公司 | A kind of sewage disposal system and method |
| CN111204849A (en) * | 2020-01-13 | 2020-05-29 | 湖南航天电团网络科技有限公司 | Sewage emergency treatment method and device, computer equipment and storage medium |
| CN112194322A (en) * | 2020-10-15 | 2021-01-08 | 福州大学 | Staged multiphase anaerobic reactor and biological contact oxidation combined short-cut nitrification and denitrification system and process |
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| CAST工艺在重庆地区小城市污水厂的应用与运行调控;王俊 等;《环境保护工程》;20120731;第30卷(第4期);第93-94页2.3节 * |
| 冬季低温期CAST工艺运行参数的优化调控;阳春 等;《中国给水排水》;20111031;第27卷(第19期);第22-23页第1-3节 * |
| 王俊 等.CAST工艺在重庆地区小城市污水厂的应用与运行调控.《环境保护工程》.2012,第30卷(第4期),第93-94页2.3节. |
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