Experimental Study Of Enhanced Primary Treatment Of Low Concentration Domestic Sewage With UASB+AF

Aiming at the fact that the concentration of the inlet wastewater of the wastewater treatment plants in South China is much lower than the expected level in design stage, which makes the operation and management of the wastewater treatment plants difficult, and leads to vast waste of funds and energy, this paper presents an enhanced primary treatment method of the combination of Upflow Anaerobic Sludge Blanket and Anaerobic Filter(UASB+AF). Some experiments on the low concentration domestic sewage with UASB+AF are carried out. The results indicated that under the normal temperature, when the hydraulic retention time(HRT) is 4h, the removal efficiencies of CODcr BOD5 and suspended solids are found to be 59.83-72.779 66.06-77.43% 82.53-87.03%. The removal efficiencies are all higher than common primary treatment.The results also indicated that the UASB+AF can start quickly, working steadily, and have good removal effect of organic matter. UASB+AF has excellent ability of bearing high impact loads, also can UASB+AF work at temperatures below 10, and keep the removal rate of 40% under this temperature.Comparing with the secondary treatment process, the costs of construction and operation of UASB+AF process is much lower, and the removal effect of it is better than primary settling tank. Enhanced primary treatment with UASB+AF has reailty significance on the process alteration of wastewater treatment plants in South China and on the popularity of wastewater treatment.