SBR污水处理工艺（SBR sewage treatment process）

1、SBR污水处理工艺（SBR sewage treatment process）SBR wastewater treatment processSBR is a series of intermittent activated sludge (Sequencing Reactor Batch Activated Sludge Process) abbreviation, is a kind ofActivated sludge wastewater treatment by intermittent aeration is also called sequencing batch activat

2、ed sludge process. Different from traditional wastewater treatment process, SBRThe technique adopts the time division operation mode instead of the space division operation mode, and the unstable biochemical reaction replaces the steady state biochemistry reaction, and the static ideal sink is place

3、dPrecipitation instead of conventional dynamic precipitation. Its main feature is the orderly and intermittent operation in operation, and the core of SBR technology is the SBR reaction poolPool homogenization, primary sedimentation, biodegradation, and two sedimentation can be applied to a pool wit

4、hout sludge recirculation system.SBR has the following advantages:1, the ideal pushing process makes the driving force of biochemical reaction increase, the efficiency is improved, the anaerobic and aerobic in the tank is in alternate state, and the purification effect is good.2, the operation effec

5、t is stable, the sewage in the ideal stationary state precipitation, need a short time, high efficiency, good water quality.3, shock resistance load, the pool has stranded water treatment, sewage dilution, buffering effect, effective resistance to water and organic dirt impact.4, the process of the

6、process can be adjusted according to water quality, water, flexible operation.5, less processing equipment, simple structure, easy operation and maintenance management.6, there is a gradient of DO and BOD5 concentration in the reaction tank, which can effectively control the bulking of activated slu

7、dge.7, the SBR system itself is also suitable for the combination construction method, which is conducive to the expansion and reconstruction of wastewater treatment plants.8, nitrogen and phosphorus removal, proper control of the operation mode, to achieve aerobic, anoxic and anaerobic state altern

8、ately, has good nitrogen and phosphorus removal effect.9. The process is simple and the cost is low. The main equipment consists of only one batch batch reactor without two settling tank, sludge return system and regulating tank,The primary settling tank can also be omitted, with a compact layout an

9、d an overall floor space.The applicable range of SBR system1) industrial waste water in small and medium-sized towns, sewage and factories and mines, especially in places where intermittent discharges and flow rates change greatly.2) where high water quality is needed, such as scenic spots, lakes an

10、d harbors, we should not only remove organic matter, but also extract phosphorus and nitrogen from water,Prevent eutrophication of rivers and lakes.3) the shortage of water resources. The SBR system can be materialized after biological treatment, and no facilities need to be added so as to facilitat

11、e the recovery and utilization of water.4) where the land is tense.5) reconstruction of existing continuous flow sewage treatment plants.6) very suitable for dealing with small water, intermittent discharge of industrial wastewater and decentralized point source pollution control.SBR process design

12、and operationSBR design should pay special attention to the problemMajor facilities and equipment1, the composition of the facilities, this principle does not have an initial sedimentation tank, this Law applies to small-scale sewage treatment plant is the main reason is simpler facilities and maint

13、enance pipesReason is more centralized. In order to adapt to the change of the flow rate, the volume of the reaction tank should be left with allowance or by setting the operating cycle. But for sightseeingWhen the ground flow rate varies greatly, the flow regulation pool should be set up according

14、to the maintenance management and economic conditions.2, the reaction tank in the form of a fully mixed type, the reaction tank is very compact, small footprint. The shape is rectangular, and the width of the pool is larger than the length of the poolAbout 1:1 to 1:2, the depth of 46 meters.The reac

15、tion water is too deep and is uneconomical for the following reasons: (1) if the water in the reaction pool is large and the depth of the discharged water increases accordingly, then the solid liquid is separatedThe required settling time will increase. The special supernatant discharge device is li

16、mited by the structure, and the depth of the supernatant water can not be too deep.The reaction pool is too shallow for the following reasons: (1) during the drainage period, due to the minimum water depth above the activated sludge interface,The depth of the supernatant should not be too deep. Comp

17、ared with other BOD SS load treatment methods, it has the advantage of less land area. reactionThe number of the pool, consider cleaning and maintenance, etc., in principle more than 2. In small or early production, sewage volume is relatively small, but also can build onePool.3 drainage deviceDrain

18、age system is an important part of SBR process design, and it is also the most important part of its design and related to the success or failure of the system. orderBefore the SBR drainage device reported at home and abroad can be summed up as following: 1 the submersible pump single point or multi

19、-point drainage. This method has large power consumption and capacityEasy to suck sludge; the pool side (side) multi point fixed drainage valve, open the valve under the self. The operation is inconvenient and the drainage is easy to bring mud;The special equipment of water decanter. Decanter is a c

20、an with the water level change and adjust the weir, drain flooded a certain depth under the surface, can preventScum entry. The ideal drainage device should meet the following requirements: 1. Large amount of water output and small flow rate in unit time, which will not cause the sludge to be heavyT

21、he water level of the collecting nozzle always decreases as the water level drops. During the period of drainage, the sedimentation remains in the middle of the reaction. The drainage equipment is firm, durable and drainageThe quantity can be stepless controlled and the automation level is high.In s

22、etting a cycle of drainage time, you must pay attention to the following items:Overflow load for the supernatant discharge - determine the quantity of equipment needed;The minimum water depth at the interface of activated sludge is mainly to prevent sludge from floating up, and the performance is de

23、termined by the supernatant discharge device and overflow loadThe water should be as small as possible;As the overflow load of the supernatant discharge device increases, the amount of treated water discharged in unit time increases, and the drainage time can be shortenedThe capacity of the treated

24、structure shall be enlarged;During the drainage period, the activated sludge floating up occurs at the end of the drainage period and begins to drain from the middle of the sedimentation process, which conforms to the SBROperation principle of the method.Aerobic and oxygen supply of SBR processThe d

25、egradation law of organic matter in SBR process is similar to that of a push flow aeration tank. A push flow aeration tank is a thrust on the space (length), while a SBR reaction tankIt is a push in the sense of time. Since the organic concentration of SBR process is gradually changing, the organic

26、concentration in the tank is higher in the early stage of the reaction, ifWhen the oxygen supply rate is less than the rate of oxygen consumption, the dissolved oxygen in the mixture is zero. For a single microorganism, the oxygen may be interruptedOxygen rate determines the rate of organic matter d

27、egradation. With the progress of aerobic process, the concentration of organic matter decreases and the oxygen supply rate begins to exceed the rate of oxygen consumption,Dissolved oxygen began to appear, microorganisms began to get sufficient oxygen supply, and the concentration of organic matter b

28、ecame one of the degradation rates of organic compoundsImportant factors. According to the relation between oxygen consumption and oxygen supply, the SBR reaction tank can maintain the sufficient oxygen supply at the beginning of the reaction, which can improve the degradation of organic matterWith

29、the advent of dissolved oxygen, the rate of oxygen supply will gradually decrease, and the operation cost can be saved and the reaction time can be shortened. The SBR reaction tank passes through the aeration systemThe design of tapered aeration more economic and reasonable use.Selection of SBR proc

30、ess ratio (1/m)The discharge ratio (1/m) of the SBR process determines the concentration of organic matter in the initial stage of the SBR process. The discharge ratio is small and the initial organic concentration is low,Otherwise, it is high. According to the rule of microbial degradation of organ

31、ic matter, when the concentration of organic matter is high, the degradation rate of organic matter is large, and the aeration time can be reduced.However, when the concentration of organic matter is high, the rate of oxygen consumption is also large, and the contradiction between oxygen supply and

32、oxygen consumption may be greater. In addition, different wastewater activated sludge sinksDrop performance is also different. The settling property of sludge is good, and the supernatant is more after precipitation. It is better to choose smaller discharge ratio, otherwise the larger discharge rati

33、o should be adopted.The selection of the discharge ratio is also related to the design load rate of sludge and the concentration of mixed liquid sludge.SBR reaction tank; mixed liquid; sludge concentrationAccording to the basic principle of activated sludge process, the size of mixed liquid sludge d

34、etermines the size of the bioreactor. The same is true of the SBR process,When the mixed liquid sludge concentration is high, the required aeration time is short, SBR reaction tank volume is small, whereas the SBR reaction tank volume is large. But,When the concentration of mixed liquid sludge is hi

35、gh, the initial oxygen consumption rate increases, and the contradiction between oxygen supply and oxygen consumption is greater. In addition, the mixed liquor in the tank is concentrated in the sludgeThe size also determines the settling time. The sludge concentration is high, and the precipitation

36、 time is long, otherwise it is short. When the sludge has good sedimentation performance, the discharge ratio is small,When the concentration of organic matter is low and the oxygen supply rate is high, a larger value can be selected; otherwise, smaller values should be used. SBR process; mixed liqu

37、or; sludge concentrationThe choice should be integrated into many factors to consider.Selection of sludge load rateThe sludge loading rate is the main parameter affecting the aeration reaction time, and the sludge loading rate is related to the concentration of organic pollutants in the final efflue

38、nt of the SBR reaction tankHeight. When the effluent concentration is low, the sludge loading rate should be low; when the waste water is biodegradable, the sludge loading rate will be increasedEnlarge。 The selection of the sludge load rate shall be based on the biodegradability of the wastewater an

39、d the quality of the effluent required.Combination of SBR process with regulation and hydrolysis acidification processSBR process adopts intermittent influent and intermittent drainage, and the SBR reaction tank has a certain regulating function, and can balance water quality and water quantity to a

40、 certain extentRole. Through the design of air supply system, mixing system, the design of automatic control mode and the choice of idle time, SBR process andRegulation, the hydrolysis acidification process to combine the three combined together, so as to save the investment and cost of operation an

41、d management.In the water inlet period, the mixer is stirred by an underwater mixer, and the water level of the inlet electric valve is controlled by the liquid level, and the time is determined according to the time needed for hydrolysis acidificationAt the time of aeration, the adjustment, hydrolysis acidification process and SBR process are organically combined together. The inlet of the reaction tank begins at the end of the idle periodSo that the whole system can function properly. The specific operation is a