Starch production process: corn → sieving → soaking (recovering corn syrup) → pulverization → germ separation (germ compressible corn oil) → grinding → sieving (powder can be used as feed) → precipitation separation (separation of zein) → starch Wash → dehydrate → dry → starch. The main source of wastewater is dry corn conveying washing water, corn soaking water, germ separation, yellow pulp wastewater and other process water. In addition, there is less ground flushing water.
The general composition of corn starch wastewater is: total sugar 0.3%~0.7%, crude protein 2.1%, solid content 5%~10%, crude fiber 2%~3%, fatty acid 0.1%~0.3%. Corn starch production is not affected by the season and can be produced throughout the year. The water consumption of the process is very large, generally 5~13m3/t corn. The main components of corn starch wastewater are starch, sugar, protein and cellulose organic matter. The COD value is 8000~30000mg/L, and the BOD5 value is 5000~20000mg/ L,
The automation control and operation management of the running process are simple.
2. The second sedimentation tank and sludge return can be omitted, the cost is reduced, energy consumption is saved, and the processing unit has a simple structure and a small footprint.
3. It has the function of adjusting the impact load and the system runs stably.
4. The concentration of dissolved oxygen in the pool is large, the utilization rate of dissolved oxygen is high, and the operating cost is low.
The design of integrated sewage treatment is mainly for the treatment of domestic sewage and similar industrial organic sewage. The main treatment method is to adopt the relatively mature biochemical treatment technology to contact oxidation method. The water quality design parameters are also designed according to the general domestic sewage water quality. Calculated, according to the level of BOD5200mg / l, effluent BOD5 according to 20mg / l, a total of six components: (1) primary sedimentation tank (2) contact oxidation tank (3) secondary sedimentation tank (4) disinfection tank, disinfection Device (5) sludge tank (6) fan room and fan. Here we introduce the integrated underground sewage equipment:
(1) Primary sedimentation tank: The primary sedimentation tank is a vertical flow sedimentation tank. The rising flow rate of the sewage in the sedimentation tank is 0.2-0.3 mm/sec, and the settled sludge is lifted to the sludge tank by air. (Note: WSZ0.5-5m3/h does not contain primary sink)
(2) Contact oxidation pond: the water after the initial sedimentation flows to the contact pool for biochemical treatment. The contact pool is divided into three stages, the total residence time is 4-6 hours, the filler is novel trapezoidal filler, easy to conjunctate, no blockage, filler ratio The surface area is 160m2/m3, and the gas-water ratio of the contact pool is about 12:1. (Note: WSZ0.5-5m3/h contact pool is level 2)
(3) Secondary sedimentation tank: the biochemical sewage flows to the secondary sedimentation tank, and the secondary sedimentation tank is operated in parallel with two vertical flow sedimentation tanks. The upward flow rate is 0.1-0.15 mm/sec, and the sludge is sent to the sludge tank by air. . (Note WSZ0.5-5m3/h sludge flows from the sludge tank)
(4) The disinfection tank and disinfection tank shall be in accordance with the specification: (TJ14-74) for 30 minutes. If it is hospital sewage, the disinfection tank may increase the residence time to 1-1.5 hours. Disinfection uses solid chlorine tablets in contact with dissolved disinfection method. The disinfection device can continuously change the dosage according to the amount of water, and achieve the purpose of adding more water and less medicine. Other disinfection devices are required and can be prepared separately. (Note: If used in industrial sewage, disinfection tanks and disinfection equipment may not be required)
(5) Sludge tank: all the sludge in the primary sedimentation tank and the secondary sedimentation tank are extracted into the sludge tank of WSZ by air for aerobic digestion. The supernatant of the sludge tank is returned to the contact oxidation tank for reprocessing and digestion. After the sludge is scarce, it is usually cleaned once every 1-2 years. The cleaning method can be carried out from the inspection hole of the sludge tank to the bottom of the sludge tank for suction and then transported. (Note: WSZ0.5-5m3/h sludge is anaerobic digestion)
(6) Fan room and fan: The fan room is located above the disinfection tank. The fan room entrance adopts double-layer sound insulation. The air inlet has muffler and fan filter, so there is basically no noise during operation.
One: integrated sewage treatment equipment product features
1. Buried below the surface of the earth, the surface above the equipment can be used as a greening or other land, without building, heating and heat preservation.
2. The secondary biological contact oxidation treatment process adopts push-flow biological contact oxidation, and its treatment effect is better than the complete mixed or two-stage series fully mixed biological contact oxidation tank. It is smaller than the activated sludge tank, has strong adaptability to water quality, good impact load resistance, stable effluent quality, and no sludge expansion. The new elastic three-dimensional filler is used in the pool, the specific surface area is large, the microorganisms are easy to hang the membrane, and the membrane is removed. Under the same organic matter load condition, the organic matter removal rate is high, and the solubility of oxygen in the air in water can be improved.
3. The biochemical pool adopts biological contact oxidation method, the volume load of the filler is relatively low, the microorganism is in its own oxidation step, and the amount of mud production is small. It takes only three months (90 days) to discharge the mud once (pumping with a drunk vehicle or Dehydrated into a mud cake for export).
4. The deodorization method of the buried domestic sewage treatment equipment is not only the conventional high-altitude exhaust