采用接触氧化与强化膜生物反应器联合处理系统(BCO-MBR)对模拟海水养殖对虾废水中有机物及氨氮的去除进行了试验研究,并对系统中实现短程硝化反硝化的可行性进行了探索.MBR出水中TOC及氨氮质量浓度水平稳定、处理效率高.联合处理系统对...采用接触氧化与强化膜生物反应器联合处理系统(BCO-MBR)对模拟海水养殖对虾废水中有机物及氨氮的去除进行了试验研究,并对系统中实现短程硝化反硝化的可行性进行了探索.MBR出水中TOC及氨氮质量浓度水平稳定、处理效率高.联合处理系统对TOC及氨氮的处理效果均较高,且系统亚硝酸盐氮的积累不明显.在联合处理系统中,膜污染情况得到有效缓解.MBR单独处理系统的膜污染情况比较严重,在15 d时出水压差已经达到30 k Pa.将BCO系统和MBR系统进行联合处理时,膜污染情况得到缓解,在系统进行到35 d时,出水压差依然在20 k Pa以下.展开更多
Litopenaeus vannamei, a euryhaline species, can be cultured at a wide range of salinities. The emergence of freshwater pond-culture ofL. vannamei is an important prelude to the continued development of shrimp culture ...Litopenaeus vannamei, a euryhaline species, can be cultured at a wide range of salinities. The emergence of freshwater pond-culture ofL. vannamei is an important prelude to the continued development of shrimp culture in China. In this study, we com- pared the respiratory metabolism of juvenile L. vannamei cultured in freshwater and saltwater by measuring their oxygen consump-tion rate （OCR）, ammonium-type nitrogen excretion rate （AER） and pyruvate kinase （PK） and lactate dehydrogenase （LDH） activi-ties at different molting stages in order to physiecologically characterize juvenile L. vannamei under freshwater conditions. The re- suits showed that OCR was significantly higher in saltwater than in freshwater at all stages of molting cycle. However, variation of OCR among molting stages in saltwater was similar with that in freshwater, and the highest OCR was observed at post-molting stage. At all stages of molting cycle, AER was significantly higher in freshwater than in saltwater, and the highest was observed at post-molting stage. The activity of PK was significantly higher in saltwater than in freshwater. Conversely, the activity of LDH was higher in freshwater than in saltwater in general. Significant variation of PK and LDH activities in molting cycle was observed in saltwater and freshwater. The results indicated that aerobic metabolism of juvenile L. vannamei was more active in saltwater than in freshwater; while its protein metabolism was more active in freshwater than in saltwater.展开更多
文摘采用接触氧化与强化膜生物反应器联合处理系统(BCO-MBR)对模拟海水养殖对虾废水中有机物及氨氮的去除进行了试验研究,并对系统中实现短程硝化反硝化的可行性进行了探索.MBR出水中TOC及氨氮质量浓度水平稳定、处理效率高.联合处理系统对TOC及氨氮的处理效果均较高,且系统亚硝酸盐氮的积累不明显.在联合处理系统中,膜污染情况得到有效缓解.MBR单独处理系统的膜污染情况比较严重,在15 d时出水压差已经达到30 k Pa.将BCO系统和MBR系统进行联合处理时,膜污染情况得到缓解,在系统进行到35 d时,出水压差依然在20 k Pa以下.
基金supported by National Program on Key Basic Research Project (Grant No.2009CB118706)
文摘Litopenaeus vannamei, a euryhaline species, can be cultured at a wide range of salinities. The emergence of freshwater pond-culture ofL. vannamei is an important prelude to the continued development of shrimp culture in China. In this study, we com- pared the respiratory metabolism of juvenile L. vannamei cultured in freshwater and saltwater by measuring their oxygen consump-tion rate （OCR）, ammonium-type nitrogen excretion rate （AER） and pyruvate kinase （PK） and lactate dehydrogenase （LDH） activi-ties at different molting stages in order to physiecologically characterize juvenile L. vannamei under freshwater conditions. The re- suits showed that OCR was significantly higher in saltwater than in freshwater at all stages of molting cycle. However, variation of OCR among molting stages in saltwater was similar with that in freshwater, and the highest OCR was observed at post-molting stage. At all stages of molting cycle, AER was significantly higher in freshwater than in saltwater, and the highest was observed at post-molting stage. The activity of PK was significantly higher in saltwater than in freshwater. Conversely, the activity of LDH was higher in freshwater than in saltwater in general. Significant variation of PK and LDH activities in molting cycle was observed in saltwater and freshwater. The results indicated that aerobic metabolism of juvenile L. vannamei was more active in saltwater than in freshwater; while its protein metabolism was more active in freshwater than in saltwater.
