Application of AA-RPIR Process in Engineering Design and Practice of a WWTP
The total scale of a wastewater treatment plant(WWTP)in Dongguan is 150 000 m3/d in Phase I and Phase Ⅱ stages.Due to the rapid growth of regional wastewater treatment demand,it faces with the problem of high-load operation and even overload operation during the rainy season.To alleviate the increasingly urgent pressure on the wastewater treatment,phase Ⅲ extension project is required,which of the civil engineering scale is 100 000 m3/d and the recent equipment installation is 50 000 m3/d.A rapid purification of wastewater using reaction precipitation integrated rectangular airlift loop reactor(RPIR)is adopted in phase Ⅲ phase extension project which is combined to form the core wastewater treatment process of"anaerobic-anoxic RPIR(AA-RPIR)".This paper mainly focuses on the design features and actual operating results of the process.The land use index in the biochemical tank of this AA-RPIR process is 0.110 m2/(m3·d-1).Compared with the traditional"AAO+secondary sedimentation tank",the land is saved by about 0.019 m 2/(m3·d-1).The"high-efficiency sedimentation tank+precision filter"process is used for the post-stage advanced treatment.The entire process has a better effect on pollutants removal,which of the maximurn removal rates of CODCr,TN,TP,SS and ammonia nitrogen are 95.9％,72.8％,96.9％,97.9％and 98.2％,respectively.A design case for the application of RPIR process in municipal WWTP is provided by this engineering,whose actual operating results can provide references for the upgrading or extension design of the other similar WWTP.
municipal wastewater treatmentanaerobic-anoxic-rectangular airlift loop reactor(AA-RPIR)rapid biochemical waste water treatment processextension projectland use indexadvanced treatment
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