【摘要】 对某腈纶污水处理厂的现有处理工艺进行了评估,考察了污染物的转化规律。结果表明,经一级生化处理后,废水中的COD、TOC和BOD₅去除率分别为51.1%、32.1%和98.1%,但二级生化处理对COD和TOC的去除没有贡献。一级生化处理过程中氨化作用显著,有机氮逐渐向氨氮和有机胺转化,含氰基的大分子逐渐降解为较小的分子,且可见光区类富里酸荧光物质向类腐殖酸荧光物质、紫外区类富里酸荧光物质转化,同时生化出水中新增溶解性微生物代谢产物。但一级生化出水中碳氮比很低,几乎没有可生化性,导致二级生化处理效果不佳。更多还原

【Abstract】 The existing wastewater treatment processes of an acrylic ?ber manufacturing plant were assessed,and the pollutants transformation rules were investigated. The results showed that after the ?rst-stage biochemical treatment,the removal rate of COD,TOC and BOD5 in wastewater was 51.1%,32.1% and 98.1%,respectively,while the second-stage biochemical treatment had no contribution to removal of COD and TOC. It was found that an evident ammonification occurred in the first-stage biochemical treatment,where organic nitrogen transformed to ammonia nitrogen and organic amines,and the macromolecules with cyanogroup gradually degraded to smaller molecules,and the furic acid-like fluorescent substances in visible region were converted to humic acid-like and furic acidlike fluorescent substances in ultraviolet region,and new soluble microbial metabolites were found in the effluent.However,a low ratio of C to N in the ?rst-stage biochemical treatment con?rmed the limited biodegradability,resulting in the ineffective second-stage biochemical treatment.更多还原