作者： Qilin Wang , Liu Ye , Guangming Jiang , Zhiguo Yuan
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摘要: Free nitrous acid (FNA) was revealed to be strongly biocidal to secondary sludge. Also, FNA was found to be more biocidal to ammonium oxidizing bacteria than to nitrite oxidizing bacteria (NOB). Based on these findings, we developed a sludge pre-treatment strategy based on FNA to enhance methane production through anaerobic digestion of secondary sludge. Also, we developed an FNA-based sludge treatment strategy to selectively eliminate NOB and achieve nitrogen removal via the nitrite pathway. Collectively, the FNA-based sludge pre-treatment approach can be used to improve biological nutrient removal, enhance methane production and reduce sludge production simultaneously in a wastewater treatment plant. This paper presents the concept.