Scheme Design for Continuous Flow Class Ⅳ Standard Upgrading Using MBBR Process in a WWTP with CASS Process in Sichuan
A wastewater treatment plant(WWTP)using CASS process with a capacity of 10×10 4 m3/d in Sichuan required upgrading to meet quasi-Ⅳ standards which is facing the problem of simultaneous improving influent loading and effluent quality.For this reason,the influent quality was checked again,and the moving bed biofilm reactor(MBBR)process was used to enhance treatment capacity,the original CASS tank was divised into a MBBR biochemical tank and a sedimentation tank,the D-type filter was transformed into a sand filter,and a new deep-filter was built.After the renovation,the effluent quality was stable and better than the quasi-Ⅳ standards,and the impact resistance was significantly enhanced.The effluent concentrations of ammonia nitrogen,total nitrogen,and total phosphorus were reduced to(0.53±0.30)mg/L,(6.70±1.40)mg/L and(0.20±0.05)mg/L,respectively.The energy consumption per ton of water and per ton of pollutants only increased by 10％and 4％,respectively.The added carbon source per ton of water increased by 15％,while carbon source consumption per ton of pollutants decreased by 8％.For nitrification,the system retains the capacity for a 20％improvement in influent quality and a 10％increase in treatment volume,enabling future expansion or adaption to higher influent loads.This case study demonstrates that the MBBR technology can meet a large range of upgrading or expansion needs,with significant advantages such as intensification,efficiency,and shock resistance.
NETL
NSTL
万方数据
