The increasing Uganda’s urban population growth has led to limited space coupled with high cost of living, thus making it difficult for the urban poor in congested areas to afford fish protein hence poor nutrition am...The increasing Uganda’s urban population growth has led to limited space coupled with high cost of living, thus making it difficult for the urban poor in congested areas to afford fish protein hence poor nutrition among the low income earners. Therefore this study was conducted to evaluate the performance of collard based bio-filtration system for filtering fish tank effluent for re-use in congested peri-urban areas. Field physical-chemical parameters (ammonia, nitrate, dissolved oxygen, temperature and pH) were measured at various bio-filter lengths in the effluent from both collard based and GBF (Gravel Based Bio-Filter). Differences in mean ammonia and nitrate levels at various lengths were analyzed using one-way ANOVA at p = 0.05. Ammonia levels were significantly reduced (p < 0.05) at various lengths: L0 99.1 mg/L;L1 75.8 mg/L (23.6%);L2 53.1 mg/L (46.4%);L3 25.8 mg/L (74%) and L4 6.6 mg/L (93.4%). Similarly, nitrate levels significantly reduced (p < 0.05): L0 11.8 mg/L;L1 7.2 mg/L (39.4%);L2 3.6 mg/L (69.2%);L3 1.6 mg/L (86.7%) and L4 0.1 mg/L (99.3%). Significant difference (p < 0.05) was obtained in mean ammonia and nitrate removal between collard based and gravel bio-filters. Collard based filter yielded higher ammonia and nitrate removal at L4 by 18.3% and 39.5% respectively, hence L4 is the effective length for collard based bio-filter.展开更多
以广西大学化学化工实验大楼排放的实验废水为例,对其水质进行为期半年的监测.监测结果表明:该水的有机物含量不高但排水量大;有代表性的重金属污染中,Hg的平均含量约为0.015 m g/L、C r平均含量低于0.1 m g/L,两者均低于《城市污水综...以广西大学化学化工实验大楼排放的实验废水为例,对其水质进行为期半年的监测.监测结果表明:该水的有机物含量不高但排水量大;有代表性的重金属污染中,Hg的平均含量约为0.015 m g/L、C r平均含量低于0.1 m g/L,两者均低于《城市污水综合排放标准》(GB 8978-1996).根据监测结果,提出采用厌氧生物滤池对实验废水进行初步处理,处理后的废水可直接排入市政管道,不会对环境造成不良的影响.展开更多
文摘The increasing Uganda’s urban population growth has led to limited space coupled with high cost of living, thus making it difficult for the urban poor in congested areas to afford fish protein hence poor nutrition among the low income earners. Therefore this study was conducted to evaluate the performance of collard based bio-filtration system for filtering fish tank effluent for re-use in congested peri-urban areas. Field physical-chemical parameters (ammonia, nitrate, dissolved oxygen, temperature and pH) were measured at various bio-filter lengths in the effluent from both collard based and GBF (Gravel Based Bio-Filter). Differences in mean ammonia and nitrate levels at various lengths were analyzed using one-way ANOVA at p = 0.05. Ammonia levels were significantly reduced (p < 0.05) at various lengths: L0 99.1 mg/L;L1 75.8 mg/L (23.6%);L2 53.1 mg/L (46.4%);L3 25.8 mg/L (74%) and L4 6.6 mg/L (93.4%). Similarly, nitrate levels significantly reduced (p < 0.05): L0 11.8 mg/L;L1 7.2 mg/L (39.4%);L2 3.6 mg/L (69.2%);L3 1.6 mg/L (86.7%) and L4 0.1 mg/L (99.3%). Significant difference (p < 0.05) was obtained in mean ammonia and nitrate removal between collard based and gravel bio-filters. Collard based filter yielded higher ammonia and nitrate removal at L4 by 18.3% and 39.5% respectively, hence L4 is the effective length for collard based bio-filter.
文摘以广西大学化学化工实验大楼排放的实验废水为例,对其水质进行为期半年的监测.监测结果表明:该水的有机物含量不高但排水量大;有代表性的重金属污染中,Hg的平均含量约为0.015 m g/L、C r平均含量低于0.1 m g/L,两者均低于《城市污水综合排放标准》(GB 8978-1996).根据监测结果,提出采用厌氧生物滤池对实验废水进行初步处理,处理后的废水可直接排入市政管道,不会对环境造成不良的影响.
