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以河砂作为渗滤介质,以养殖废水作为处理对象,在水力负荷为0.26 m/d,1 d淹水,2 d落干的运行方式下开展了生物渗滤床处理养殖废水及微生物活性变化规律研究,用脱氢酶活性和生物量等指标进行了污染物的去除机理和对系统堵塞机理的讨论。结果表明,微生物活性及微生物量随渗滤介质层的加深,先升高后降低,在生物渗滤床的渗滤介质上层0.65 m范围内,系统对污染物的去除率达到80%,污染物的去除主要发生在中上层介质。在一个淹水、落干周期内,微生物活性呈现基本保持不变、后逐渐升高和再降低的趋势,经历了一个完整的微生物的生长曲线,未出现堵塞问题。
Using river sand as percolating medium and aquaculture wastewater as object of treatment, bio-percolation bed was used to treat the wastewater and microbial activity under hydraulic load of 0.26 m / d, 1 d of flooding and 2 d of drying. Regular study, the removal mechanism of pollutants and the discussion of the system blockage mechanism were carried out by using the indicators of dehydrogenase activity and biomass. The results showed that microbial activity and microbial biomass increased firstly and then decreased with the deepening of the diafiltration medium. The removal rate of pollutants was 80% in the upper 0.45 m of the percolation bed. The pollutants The removal occurs mainly in the middle and upper media. During a flooding and dry-down period, the microbial activity showed a tendency to remain basically unchanged, then gradually increased and then decreased. After a complete microbial growth curve, no plugging occurred.