Design general specification: the graduation design is a comprehensive consideration of water characteristics, processing requirements, project investment, operation cost, etc., through technical and economic comparison and analysis, the choice of appropriate sewage treatment scheme.According to relevant data, complete the integral design of the sewage treatment plant and the structures of the drawing.

Design principle: on the premise of to ensure water quality standard, as far as possible to save construction cost, selection of advanced technology, low operation cost and reliable process;Equipment choice, requires attention to convenient operation, management, simple, and easy to maintenance;To ensure long term stable operation of the entire process:Requirements on layout reasonable, compact, save floor as far as possible;Make the most of the existing pipeline, using new materials and new technology, optimize the layout.

The design content includes 6 a design specification, drawing, including total sewage treatment plant floor plan, process flow diagram, and the main structure diagram.

By looking at data and comparison, finally selected A/O process, subject to A food and beverage wastewater treatment process design.A/O process is also called Anaerobic aerobic process method, A (Anaerobic) is Anaerobic period, is used for denitrification and phosphorus removal;O (Oxic) is aerobic period for in addition to the organic matter in the water.

The plant's design flow for 300.This sewage plant process flow is: from the grating into the boost pump room, into the fine screen, enter the balance adjusting pool, into the hydrolysis acidification pool, into one, the secondary contact oxidation pool, into the second pond, the final effluent.Sludge process of part are as follows: from the contact oxidation pool and the second pond, the discharge of sludge from sewage pump room into the sludge thickener, the dehydration machine room, the last shipment outside the factory.

Grille: to remove large suspended solids in the waste water or floater, fiber material and solid particulate matter, ensure the normal operation of the subsequent processing units and water pump, reduce the processing of subsequent unit load, to prevent clogging dredge pipeline.Upgrading sewage pump room: improve the sewage water level, to ensure that water flows in the whole process, to achieve the sewage purification.Balance adjustment pool: waste water discharge is uneven, displacement sometimes more, sometimes less.Through here can adjust the effect of water quantity and water quality, makes into the subsequent processing of the basic stability of water quality and quantity, facilitate subsequent processing.Through the fan into the air, also consumes a small amount of organic pollutants.Hydrolysis acidification pool: is to control the anaerobic reaction of acidification phase and oxygen treatment system, is mainly the complex organic matter is decomposed into small molecule organic matter, improve the wastewater biological sex, thus reducing the subsequent aerobic treatment time and power consumption.Anaerobic acidification biological treatment high organic load, low energy consumption, simple operation and convenient, for polymer complex organic matter degradation effect significantly, can remove part of the COD and BOD5.Contact oxidation pool: wastewater by hydrolytic acidification, pollutants concentration greatly decreased, macromolecular complex organic matter also is broken down into small molecule organic compound, can further improve biological sex, and then enter the contact oxidation pool for aerobic treatment.Sedimentation tank, settling basin is a kind of commonly used structures separation of suspended solids.Come out from the contact oxidation pool of organic pollutants in wastewater treatment, but just came out from the oxidation pond water contains a large amount of sludge, the flocculation body, etc., through the role of the precipitation separation tank makes sludge sedimentation on the bottom, the upper water clarification, can satisfy.Sludge concentration pool: liquid from the tank out of the sludge, the moisture content is often higher than 95%.Sludge enrichment is the effective method to reduce the moisture content of sludge, reduce sludge volume.Through sludge concentration greatly reduce the volume of sludge, again through the containing filter press filter system, makes the sludge drying, size, weight decrease further, facilitate outbound processing are solid.The sewage treatment plant effluent requirements to the pollutant emission limits of guangdong province (DB44/26-2001) level 3 standard discharge.According to the design, the treatment effect is: the COD removal rate of 78.8%, 76.6% removal rate of BOD and ammonia nitrogen removal rate of 100%.A/O process of BOD5 higher removal rate can reach 90 ~ 95%, nitrogen efficiency is 70-80%.However, due to the A/O process is simpler, also has its outstanding characteristics, still is A widely used process.Water index is: COD: 500 mg/L, BOD: 300 mg/L, SS done, ammonia nitrogen, 0 mg/L, can reach level 3 standard.