Key Points and Characteristics of Process Design of Shahe Underground WWTP and 3#Storage Tank in Shenzhen
The design scale of Shahe underground wastewater treatment plant(WWTP)is 100 000 m3/d in the dry season and an additional 100 000 m3/d of initial rainwater in the rainy season.The design scale of the 3# reservoir is 153 000 m3.The process of the WWTP consists of pretreatment,step-feed multistage anaerobic-aerobic(AO)biological reactor,secondary sedimentation tank,high efficiency sedimentation tank,precision filters and ultraviolet disinfection,and the effluent water quality is required to meet grade B standard of the Shenzhen local standard Standards of Water Quality for Wastewater Treatment Plant(DB 4403/T 64-2020).Among them,TN≤8 mg/L.The sludge treatment process includes mechanical concentration and low temperature heat drying,and the sludge is transported out for incineration after the water content is no more than 40％.As the first fully underground water pollution control complex at home that deeply integrates the WWTP with the initial rainwater reservoir,the project innovatively adopts step-feed multistage AO and"3W"(Wet-Weather-Wastewater)process.Based on this,a system solution that can realize the high-standard collaborative treatment of large-scale sewage and initial rainwater without greatly increasing the volume,investment and operating cost of wastewater treatment facilities is proposed.
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