李秀辰, 李俐俐, 张国琛, 牟晨晓, 母 刚. 养殖固体废弃物作碳源的海水养殖废水反硝化净化效果[J]. 农业工程学报, 2010, 26(4): 275-279.
    引用本文: 李秀辰, 李俐俐, 张国琛, 牟晨晓, 母 刚. 养殖固体废弃物作碳源的海水养殖废水反硝化净化效果[J]. 农业工程学报, 2010, 26(4): 275-279.
    Denitrification of wastewater with external carbon source of solid wastes in recirculating marine culture system[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2010, 26(4): 275-279.
    Citation: Denitrification of wastewater with external carbon source of solid wastes in recirculating marine culture system[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2010, 26(4): 275-279.

    养殖固体废弃物作碳源的海水养殖废水反硝化净化效果

    Denitrification of wastewater with external carbon source of solid wastes in recirculating marine culture system

    • 摘要: 由于养殖废水C/N低且溶解氧(DO)含量高,需要补充碳源并有效脱氧,才能保证高效反硝化。该文开展了以养殖固体废弃物作碳源,海水养殖废水水解、反硝化净化工艺的试验研究。结果表明,养殖废水(水解种污泥与养殖固体废弃物体积比为1︰1、水温20℃)经过10 h水解,水解液DO质量浓度降至0.2 mg/L,NH4+-N、NO3--N、总有机物(TCOD)和总固体(TS)的去除率分别为62.8%、43.5%、24.0%和13.6%。当水解种污泥与养殖固体废弃物体积比为1︰1.5~1︰2.5时,养殖废水在20℃条件下水解6 h,水解液中挥发性脂肪酸(VFA)质量浓度和溶解性有机物/总有机物(SCOD/TCOD) 分别增加32.0%~49.3%和3.5%~9.1%。利用厌氧活性污泥对养殖废水的水解液(体积比为1︰4、水温20℃)进行反硝化净化,NO3--N和TCOD的3 h去除率分别达99.6%和88.3%,而养殖废水直接反硝化10 h, NO3--N和TCOD的去除速率分别为36.5%和75.9%。这表明,在海水循环水养殖系统中,利用养殖固体废弃物作碳源,养殖废水水解、反硝化工艺,能有效脱氧和补充有机碳源,养殖废水反硝化净化效果显著。

       

      Abstract: In recirculating aquaculture system, wastewater characterizes as low C/N ratio and high dissolved oxygen (DO) content, deoxygenating and adding extra organic carbon are necessary for complete denitrification of wastewater. Solid wastes were utilized as extra organic carbon source in the anaerobic hydrolysis and denitrification of wastewater in recirculating marine culture system. After hydrolysis for 10 hours of the wastewater (with volumetric ratio of hydrolytic sludge to solid wastes of 1:1 and at 20℃), the concentrations of NH4+-N, NO3--N, total chemical oxygen demand (TCOD) and total solid (TS) decreased 62.8%, 43.5%, 24.0% and 13.6%, repectivelly, and DO concentration dropped to 0.2 mg/L. When wastewater, which the volumetric ratio of hydrolytic sludge to solid wastes was kept within 1:1.5-1:2.5, hydrolyzed at 20℃ for 6 hours, volatile fatty acid (VFA) concentration and SCOD/TCOD ratio (dissolved organic substance / total organic substance) would increase 32.0%-49.3% and 3.5%-9.1%, respectively. Denitrification of hydrolytic wastewater (with volumetric ratio of anaerobic denitrifying sludge to hydrolytic wastewater of 1:4) could completely carried out at 20℃. The consequent removal rate of NO3--N and TCOD in 3 hours reached to 99.6% and 88.3%, respectively. Whereas 36.5% and 75.9% of removal rate for NO3--N and TCOD in 10 hours were observed in direct denitrification of marine culture wastewater. It is demonstrated that in recirculating marine culture system complete denitrification is possible by a combining hydrolysis of solid wastes and wastewater.

       

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