腈纶污水处理厂污染物转化规律分析

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。

Study on pollutants transformation rules of acrylic fiber manufacturing wastewater in treatment processes

The existing wastewater treatment processes of an acrylic fiber manufacturing plant were assessed,and the pollutants transformation rules were investigated. The results showed that after the first-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 acid-like 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 first-stage biochemical treatment confirmed the limited biodegradability,resulting in the ineffective second-stage biochemical treatment.