利用小空间厌氧移动床还原硫酸盐的试验研究

为了强化硫酸盐还原反应器的还原效能,利用小空间厌氧移动床生物膜反应器,研究了反应温度、进水pH、水力停留时间( hydraulic retention time,HRT)、ρ( COD)/ρ( SO2-4)和回流比对SO2-4还原效果的影响,从而考察反应器还原SO2-4的效能及在高负荷条件下稳定运行状况.研究结果表明：温度35℃、进水pH=7.0、ρ( COD)/ρ( SO2-4)=2.5、HRT=8 h和回流比=4：1为反应器运行的最佳工况条件；进水SO2-4质量浓度在1500~2500 mg/L时,SO2-4的还原率保持在78.77%~88.89%,SO2-4的还原速率最高达5.90 kg/(m3·d),表明反应器具有较强的SO2-4还原能力；在进水SO2-4质量浓度为2250 mg/L左右时,连续运行20 d,SO2-4还原率达87.13%并能稳定运行.

Reduction of Sulfate by Using Small Space Anaerobic Moving Bed Reactor

To enhance the sulfate reduction efficiency, the effects of temperature, influent pH, HRT,ρ( COD)/ρ( SO2-4 ) and reflux ratio on the sulfate reduction were discussed by using small space anaerobic moving bed biofilm reactor. Then the reducing SO2-4 efficiency and stable operation were also studied under high load conditions. Results indicate that the optimal conditions for reactor operation is at temperature 35℃, influent pH=7. 0, ρ( COD)/ρ( SO2-4 ) = 2. 5, HRT=8 h and reflux ratio=4:1. When the sulfate reduction rate remains in the range of 78. 77% -88. 89% and sulfate concentrations ranges from 1 500 to 2 500 mg/L;sulfate removal rate is up to 5. 90 kg/m3·d and there is a high SO2-4 reduction capacity in reactor. When the condition of the influentsulfate concentrations is 2 250 mg/L and continuous reactor operation for 20 d, the sulfate removal efficiency reaches more than 87. 13% and the reactor keeps stable operation.