The working period of each sediment pool is 14 days, 7 days for water intaking, 3~4 days for compaction and dewatering, 4~3 days for sand excavation and cleaning.
The slaughter wastewater was treated with circumgyrating sediment pool,bio-contact anaerobic pool and SBR biological aerobic reactor; the effluent COD lowered to 62.3mg/L from 1290~4140mg/L; various fouling indexes practically determined reached the second class discharge standard of Sewage Comprehensive Discharging Standard(GB8978-1996).
In the treatment of high SS waste water, including secondary sediment pool infall and mill waste water, the bioflocculant showed high flocculating activity (94.7%);
Since the direct supply of nitrate or nitrite from the water column only accounted for 27% of the total denitrification at the highest estimate, nitrogenous oxide in the sediment pool was the major contributor to sedimentary denitrification.
The drilling mode in the saltfield,different from that in bedrock,has a strict requirement on the flushing fluid.There are some poor phenomena such as the pollution of solid phase, shale liquefaction and brining in drilling course of Jiangsu saltfield.To prevent pollution of solid phase,the optimum method is to prepare drilling fluid of non-solid or less solid phase and to make the viscosity and content of solid phase minimized.As a result,a good flowability and effect of sand precipitation make great contr...
In view of the design of peripherally in coming water commonly adopted in the gravitative sediment pool in the sewage treatment system, the paper puts forward a scheme increasing the effluent devices and raising the sediment efficiency at a proper position through the analysis and improvement of water flow cross section in a sediment pool.
The up -to-standard rate of beneficiation waster treatment reaches 100% and the purification effectiveness scores 99 85% if change the 18m thickener into whirling flocculation sediment pool. Other water quality parameters are lower than the state wastewater discharge standard. The rate of sewage discharge at the bottom of thickener increases to 31 89%from 15%. An annual economic interest of over one million can also be obtained.