摘要
汉沽化工废水成分复杂,含有较高浓度的BOD_5,COD,NH_3-N、PO_4-P、氯化物、汞等。经多级模拟生物氧化塘处理后,废水得到有效净化。净化后的污水,因氯化物浓度过高不宜用于农灌。但可用于养鱼,进行综合利用,实现污水资源化。 在净化后污水中进行罗非鱼(Tilapia mossambica)养殖实验,历时132天。在未人工投饵的情况下,试鱼生长、繁殖正常,而且肌肉中汞的积累不明显,最高汞含量变化在0.35—0.40μg/g之间,接近食用要求。 污水中藻类等饵料生物丰富,生物生产力较高。在浮游植物生产量和底栖动物生物量的基础上,估算了改建后污水库鱼类的生产能力。 鱼类养殖是氮、磷丰富的台盐、含汞化工废水回用和生物去氮,去磷的重要途径。而且是含汞废水净化效果的重要指标。
This paper deals with the possibility of fish culture in the effluent purified by simulation stabilization pond which is consisted of 4 cells with 45 days of hydraulic retention time. The effluent quality is improved remarkbly through simulation pond. Before purifying, the raw waste water contains high levels of BOD5, COD, NH3-N, PO4-P, chloride, mercury etc (Table 2.).Some 50 young fish (Tilapia mossambica) are reared in the effluent. 2 or 3 fish are caught out in different sampling time for examination of growth and mercury content. No food has been added to the fish outside the simulation pond system during experimental interval of 132 days. The results obtained are as followss1. The growth and breeding behavoir of the T.mossambica are quite well. No dead sample has been found in the effluent during the exposed test. It indicates that the effluent quality is good for fish growth and reproduction.2. The mercury content of T.mossambica is slightly increased with increasing exposure time. The average mercury contents vary between 0.35 and 0,40 Hg/g including initial mercury content of 0.14Hg/g of test fish. This mercury contents of test fish are much lower than those of crucian carp (Carassius aura-tus) living in Hangu Sewage Lagoon which receives the same kind of waste water as the simulation pond and the mercury content of crucian carp reaches to 7.7μg/g through 100 day exposure time.3. The biological productivity of effluent is very high because of high levels of nitrogen and phosphorus. The potential fish productivity in designing fish pond is estimated based on the data of the primary production of phytoplankton and biomass of benthos. If some fish contains mercury too high for human consumption, it still could be used as food for mink.4. Data obtained indicate that the fish culture is one of the important approaches in the reuse of industrial waste water which contains high concentrations of nitrogen,phosphorus,chloride and mercury through purifying by multicell stabilization pond.
出处
《生态学报》
CAS
CSCD
北大核心
1989年第1期1-8,共8页
Acta Ecologica Sinica
关键词
化工废水
渔业
利用
净化
chemical waste water, fishery utilization.
