净水厂沉淀池排泥水回用及其生物稳定性

Reuse and bio-stability of sludge water from sedimentation tank in water treatment plant

基于净水厂沉淀池排泥水回用的中试试验,探析排泥水回用工艺出水水质安全和生物稳定特性,探讨净水厂排泥水回用的可行性。试验表明:排泥水的AOC和BDOC浓度均值分别为98.16μg/L和1.92mg/L,且AOC和BDOC浓度与水温呈显著线性相关特性;污泥回流比(泥水∶原水)为3%时,出水未检出细菌总数,且出水浑浊度、氨氮、COD Mn等指标均满足《生活饮用水卫生标准》(GB5749-2006);出水的AOC和BDOC浓度均值分别为88.67μg/L和0.21 mg/L,保障了水质的生物稳定性。因此,净水厂在合理控制回流比条件下,排泥水回用不仅具有可实施性,而且实现了净水厂节能减排的可持续发展理念。

Based on a pilot test of sludge water reuse in the sedimentation tank of the water treatment plant,the water quality safety and biological stability characteristics of the effluent from the sludge reuse process and the feasibility of the sludge water reuse in the water treatment plant were discussed.The results showed that the average concentrations of AOC and BDOC in sludge water were 98.16μg/L and 1.92 mg/L,respectively.The concentration of AOC and BDOC was significantly correlated with water temperature.The total number of bacteria in effluent water was not detected,and the turbidity,ammonia nitrogen,COD Mn and other indicators of water all conform to Sanitary Standard for Drinking Water Quality(GB 5749-2006)when the sludge return ratio(sludge:raw water)was 3%.The average concentrations of AOC and BDOC in the effluent were 88.67μg/L and 0.21 mg/L,respectively,which guarantee the biostability of the water.Therefore,the recovery of sludge water under the condition of reasonable control of return ratio is not only implementable,but also realizes the sustainable development concept of energy saving and emission reduction of the water treatment plant.