Village(community) Centralized Collection Of Sewage Anaerobic Strengthening Technique Of Pretreatment

In the 21 st century, With the improvement of people’s living standard, the new rural construction and the urbanization advancement, make the rural, urban and rural integration of appeared a group of si milar to the urban community villages and com unities, every day there are a large amount of sewage produced, affect the surounding water and residents’ living environment. These areas did not include urban pipeline, need to build sewage treatment system just for these.Existing research shows that domestic pollution in Guanzhong section of W eihe accounted for 42% of the total amount of pollution, one of the main causes of polltion in Weihe sewage treatment compliance rate is low. But, simple and p ractical, low oeration cost, stable operation, suitable to the similar guanzhong region north of the village(community) centralized sewage treatment engineering low cost few reports. Anaerobic technology in China is an im portant direction of anaerobic treatm ent was applied to sewage pretreatment stage, not just in rural, suburban, and further appliction in the city. Anaerobic pretreatm ent, combined with the artificial wetland, oxidation pond, trickling filter, so lar aerobic treatment and land treatm ent technology, is the iportant direction of rural sewage treatment(community). Transformation for four aspects:(1) Set up diversion wall and diversion tube set ditches, pits, in th e bottom, extend the hydraulic retention tim e of about 35%, using the principle of hydraulics, increase the reaction area sludge con centration, improve the effect of mud mixture, re-duce the dead zone;(2) Use of the earth temperature, increasing the reaction tem perature in winter water core biochemical reaction zone, increase reaction efficiency;(3) Hanging packing, improve the efficiency of biochemical treatment;(4) Improve the water way, to prevent su rface debris flow, improve the removal efficiency.On the basis of the reaction, to carry out the experiment and application dem ostration research. The main conclusions were as follows:(1)Test results show that: In the r eactor start-up stage, when the water tem perature is less than 10℃, will seriously affect the reactor startup, lead the reactor start-up failure. The water tem perature has obvious effect on C OD removal rate, the water temperature at 12℃~19.8℃, the COD removal rate is 34%~34%; temperature drop to 2℃~ 10℃, COD removal rate fell to 25%~35%, when the water temperature in 33℃, COD removal rate was 65%. W hen adding four root filling, add filler in the case of COD removal rate accounted for 44% of the total removal rate of COD, When adding tow root filling, add filler in the case of COD removal rate accounted for 46% of the total removal rate of COD, when left one packing, packing case to move COD capacity decreased obviously, than to adding two packing low COD removal rate of 20%. No anaerobic sludge, the remova l rate of COD is 26.3%~33.8%, the same tem perature, with anaerobic sludge, the removal rate of COD is 44.2%~62.27%, COD removal rate is higher than without anaerobic sludge 12%~28%.(2) During the test, demonstration project ran 457 days. Examines the daily variation of water quality of the four seasons ch ange and the water effect the treatm ent effect of the s ystem, In the changing seas ons, TCOD, SCOD, ammonia nitrogen, total nitrogen, total phosphorus and nitrate nitrogen are the lowest in the summer, when t he highest daily variation in twenty past seven. During the operation, the water tem perature has obvious effect on COD re moval, the water temperature up to 24℃, COD removal rate is about 70% right now, wint er, the lowest temp erature dropped to 10 ℃, the COD removal rate dropped to about 50%.