Composting-a solution of eliminating a nitrite-rich wastewater by reusing it as a moisture conditioning agent

文献类型： 外文期刊

第一作者： Xie, Dong

作者： Xie, Dong;Gao, Ming;Yang, Min;Xu, Mingyue;Meng, Jie;Wu, Chuanfu;Wang, Qunhui;Wu, Chuanfu;Wang, Qunhui;Liu, Shu;Sun, Xiaohong

作者机构：

关键词： Composting; Moisture adjustment; Nitrite-rich wastewater; Organic matter decomposition; Nitrous oxide; Free nitrous acid

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2021 年 284 卷

页码：

收录情况： SCI

摘要： Composting could be applied to dispose various organic solid wastes and liquid wastes. Literature suggested that reusing a nitrogen-rich wastewater as a composting moisture conditioning agent could promote the maturity and nitrogen content of compost. However, it's unclear whether a nitrite-rich wastewater could be eliminated by composting because of the toxicity of nitrite. In this study, a nitrite-rich wastewater (STL, pH = 7.9) was reused as a composting moisture conditioning agent. The influence of STL reusing period (i.e., adding STL from the first day of mesophilic, thermophilic, and cooling period, and the addition lasted for 10 days) on composting performance was also discussed. Results revealed that organic matter decomposition was strongly suppressed by high concentration of free nitrous acid when STL was added in mesophilic period, whereas the organic matter hydrolysis was prompted when STL was added in thermophilic and cooling period. STL addition enhanced nitrification at high temperatures during composting, thus increasing the nitrate content of compost by 2-10 times compared with that of the control group (using tap water as a moisture conditioning agent). Nitrite addition also stimulated nitrous oxide emissions yielded by biotic or chemical processes during STL addition, especially under the transient condition at 50 degrees C-55 degrees C, and resulted in a 28%-39% increase in greenhouse gas emissions compared with that of the control group. Therefore, the composting could be a solution of eliminating a nitrite-rich wastewater by reusing it as a moisture conditioning agent when nitrous oxide emission issue was properly addressed.

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