| Water entironment pollution of Lake Taihu has enhenced day by day in the recent years.The pollution of nitrogen and phosphorus has became severely,it made great influence about society and economy. So the disposition of water circumstance in Lake Taihu area has become the most imperative thing that will be done. One cause of this non-point pollution is rural domestic wastewater. This task adopted hydrolysis/pulse and active trickling filte to establish advanced treatment progress and technology which based on the combine of the sporadic rural fact complexion after test, in ordor to provide the experiences for following treatment tasks of Lake Taihu.Based on these,The following conclusions can be arrived at during the practice by experimentation researching :1. The treatment effect of rural domestic wastewater by Hydrolysis/pulse and active trickling filter has influenced by temperature, hydraulic and process load, circumfluence ratio, C/N and so on..when the temperature was 20℃approximately, hydraulic load was 4.0m3/m2·d, COD cubage load was about 0.8kgCOD/m3·d, NH4+-N cubage load<0.06kgNH4+-N/m3·d, circumfluence ratio was 200%, C/N between 5～10,the technics achieved the best treatment effect, the treatment effect of COD,NH4+-N,TN reached 80%,80%,40% respectively.2. The patency effect of its treatment capability was temperature,when temperature increased each 5℃,the the treatment effect of COD,NH4+-N,TN each advanced 5%,11.7%,6.5%.The DO of export water decreased as temperature rose. Heat preservation was availability to boost the capability of the technics, after heat preservation the treatment effect of COD,NH4+-N,TN each reached 60%,65%,25%.3.It is feasible to use plaster to improve phosphorus removing effect,the best method of phosphorus adding is hydrolysis pond+ filter+ vegetable groove.When the temperature was 20℃, circumfluence ratio was 200%, C/P between 60～118, phosphorus concentration was 5mg/L,DO<0.2mg/L and NO3--N<1.3mg/L in hydrolysis pond,the phosphorus treatment effect of this technics was 65﹪.4. The removing of organic compound happened in the middle or the up of the filter,but the removing of ammoniate happened in the middle and down of the filter.5.The test of nitration potential indicated that the reaction speed of nitration was 1.65×10-6gNH3-N/g pottery·h,2.33×10-6gNH3-N/g pottery·h,2.84×10-6gNH3-N/g pottery·h from the top down of the filter when the temperature was 25℃.The the reaction speed of denitrification was 3.2×10-6gN0x-N/g mud·h,1.8×10-6 gN0x-N/g mud·h when the temperature was 15℃and 25℃.
|
PDF Full Text Request