Shandong L water treatment plant(WTP)is designed with a capacity of 120 000 m3/d.Before upgrading and renovating,the WTP primarily uses conventional treatment processes and adds potassium permanganate and powderes activated carbon to remove 2-methylisoborneol(2-MIB)and geosmin(GSM)from raw water,but this can only cope with 2-MIB mass concentrations not exceeding 80 ng/L.To meet the requirements of the new Standards for Drinking Water Quality(GB 5749-2022)and enhance water supply quality,a pre-ozone/hydrogen peroxide(O3/H2O2)-biochar fluidized bed process is constructed.This innovative approach involves integrating advanced treatment processes prior to conventional treatment to remove odorous compounds and minimize the adverse effects of organic matter and algae on standard treatment,thus improving overall treatment efficiency.After upgrading and renovating,when the 2-MIB mass concentration in the raw water does not exceed 600 ng/L,the mass concentration of 2-MIB in the filtered water decreases to below 5 ng/L.Other water quality indices,including the permanganate index,turbidity and particle count,also showes substantial improvement.Additionally,the WTP discontinues the use of powdered activated carbon and potassium permanganate,reduces the dosages of PAC and sodium hypochlorite,and decommissiones the flotation process.As a result,the water production cost per cubic meter is lowered by 0.129 yuan to 0.171 yuan.This case study provides valuable engineering experience and serves as a reference for similar upgrading in WTP.
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