The wastewater produced is used for discharging after sewage treatment or for irrigation of green areas, car washing, toilet flushing, and ground washing. Both can increase water resources, but also can reduce the amount of sewage discharge is a good thing for the country and the people in one fell swoop.
In order to strictly abide by the relevant environmental laws and regulations, to protect the environment, the spirit of economic construction and environmental protection synchronization of the "three simultaneous" principle. My unit was invited by the investor, in the preliminary research, and after a number of juice sewage treatment based on successful practical experience, the preparation of the juice plant sewage design program for the relevant departments to make decisions, implementation.
For the characteristics of the water quality of the sewage, the program is proposed to use conventional air flotation and "A/O biological contact oxidation" process, the treatment process is relatively simple, easy to operate, low daily costs, stable water, the main equipment for the steel structure.
The wastewater discharged from the plant is mainly some juice sewage, the water contains suspended solids, chromaticity, sewage biochemistry is poor, mainly inorganic pollution. According to the characteristics of the wastewater and combined with our experience in dealing with similar projects, the wastewater is first pre-treated and then used in a combination of biological treatment process, so that the wastewater can achieve the desired treatment effect.
The process includes the following:
Regulation of water quality and quantity, air flotation and degumming, anaerobic fermentation and decomposition, aerobic treatment, separation of mud and water, biological treatment and biological filtration, disinfection and qualified discharge. The process adopts the combination of air flotation, anaerobic, aerobic and aerated biofilter, which has significant effect on the treatment of juice wastewater, and the effluent water quality is stable and meets the standard discharge. Air flotation process to take direct ultra-fine high-efficiency air flotation machine, which can save engineering investment and operating costs, the composition of the use of air-floatation principle of preliminary removal of suspended solids and organic matter in the wastewater, adding flocculants in the water intake pipeline, you can remove suspended solids in the wastewater, but also eliminates the conventional flocculation and precipitation filtration and other complex processes.
First of all, the comprehensive sewage through the downstream pipe into the regulating tank, and then by the pump to lift the sewage to the air flotation machine, solid-liquid separation, can make the water clear, the vast majority of suspended and colloidal solids from the sewage is separated out. ss, COD, BOD5 concentration decreased significantly, the concentration of Cr3 ＋ and S2- in the effluent water to meet the need for subsequent biological treatment. After air flotation treatment, the water flows into the aerobic biological treatment unit - immobilized aeration biofilter. Aerobic biological treatment usually uses activated sludge and biofilm method. Activated sludge method (oxidation ditch, SBR and push-flow aeration tank) process operation is more stable and mature, but the activated sludge impact resistance is poor, the removal rate is low, especially for poor biochemical sewage is not obvious, and covers a large area, high power consumption, complex operation and management, sludge cultivation time is longer, especially in the plant overhaul period of sludge easy to inactivate, sewage treatment and then run the sludge has to be re-cultivated.
Fixed Sludge
Immobilized aeration biofilter set adsorption, oxidation and filtration in one, the treatment effect is good, the amount of sludge is small, low power consumption, good effluent quality, is currently the advanced process of water treatment. In the traditional biological treatment, there is a common difficult to degrade will produce inhibition of microorganisms, resulting in high effluent water quality, the system microbial activity is not high phenomenon. And our company uses high efficiency microorganisms to overcome this shortcoming, the product is the use of genetic engineering means of natural microorganisms to strengthen and modify the microbial activity and adaptability to improve the microbial activity, can effectively degrade the sewage in the difficult to degrade organic matter.
The sewage enters the aerated biofilter for aerobic treatment, and the organic matter is transformed into carbon dioxide and water by aerobic microorganisms. Immobilization - aeration biofilter effluent and then through the sedimentation process, the effluent can be discharged
2.3.2: process flow diagram:
Juice integrated wastewater - grating wells - catchment tanks --Conditioning tank --High-efficiency air flotation machine --Class A oxygen tank --Class O oxidation tank --Dual sinking tank (inclined tube sedimentation) --Sludge tank Sludge tank - quartz sand filter (with backwashing device) - activated carbon dilution device (with backwashing device) - discharge standards