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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Performance of Magnesium Ammonium Phosphate Precipitation and Its Effect on Biological Treatability of Leather Tanning Industry Wastewaters
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Performance of Magnesium Ammonium Phosphate Precipitation and Its Effect on Biological Treatability of Leather Tanning Industry Wastewaters

机译：磷酸镁铵沉淀的性能及其对制革工业废水生物处理性能的影响

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摘要

Leather tanning industry is one of the several industries discharging significant amount of nitrogen. Magnesium ammonium phosphate (MAP) precipitation is a promising pretreatment for leather tanning industry wastewaters for the control of toxic parameters; excess suspended solids as well as nitrogen which increase the cost and complexity of following biological treatment. Application of MAP precipitation, however, modifies the characteristics and biological treatability of wastewaters. In this study, characteristics and biological treatability of MAP precipitation effluent were experimentally investigated using the wastewaters obtained from a bovine leather processing plant. An experimental study involving the determination of COD fractions and kinetic parameters of biological treatment was conducted for both gravity settling and MAP precipitation. Results of the study indicated that MAP precipitation, in addition to high degree of nitrogen removal, yielded a soluble, readily biodegradable effluent which was also free from toxics. MAP precipitation provided an effluent COD of almost half of that of gravity settling. Reduced value of soluble residual microbial products (Sp) obtained with MAP precipitation effluent was an additional benefit.
机译：制革业是排放大量氮的几个工业之一。磷酸镁铵（MAP）沉淀法是用于皮革制革工业废水以控制毒性参数的有前途的预处理方法。过量的悬浮固体以及氮，这增加了后续生物处理的成本和复杂性。然而，MAP沉淀的应用改变了废水的特性和生物可处理性。在这项研究中，使用从牛皮革加工厂获得的废水，对MAP沉淀废水的特性和生物可处理性进行了实验研究。对重力沉降和MAP沉淀进行了涉及COD分数测定和生物处理动力学参数的实验研究。研究结果表明，MAP沉淀除高度去除氮外，还产生可溶的，易于生物降解的流出物，该流出物也没有毒性。 MAP沉淀提供的废水COD几乎是重力沉降的一半。使用MAP沉淀流出物获得的可溶性残留微生物产品（Sp）的价值降低是另一个好处。

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