高级氧化技术强化皮革废水生化处理效果初探

皮革废水中含大量难降解有机物,导致常规好氧生化处理速率低、效果差.实验考察了在Us(超声波)、UV(紫外光)、US/Fenton、UV/Fenton等高级氧化技术强化作用下的生化处理效果,结果表明,在相同水质和实验条件下,废水经Us、UV处理30min后可使后续生化反应速率显著提高,分别反应8h、24h后的COD去除率即可达到直接经微生物处理48h后达到的48%,但延长反应时间至48h对COD去除率没有明显提高;Fenton试剂强化US、UV的处理效果要高于单独Us、UV工艺,经30min预处理,随后在微生物作用下分别反应4h和8h即可达到45%和51%的COD去除率,同时延长反应时间也能使最终COD去除率明显提高,反应48h后,COD去除率可分别提高至64%和72%.

Improving the Biodegradability of Tannery Sewage by AOPs

A lot of persistent organic pollutants are contained in tannery sewage, which makes the performance of microorganisms unsatisfactory in the bio -technological sewage treatment plant. Advanced oxidation Processes (AOPs) , such as ultrasonic (US) , ultraviolet (UV) , US/Fenton and UV/Fenton are introduced to improve the biodegradability of the tannery sewage. The results showed that the pretreatment of the sewage in 30min by AOPs can greatly shorten the bio-reaction time. With the reaction of 8h, 24h, 4h and 8h in the following biodegradation processes after the pretreatment by US, UV, US/Fenton and UV/Feriton respectively, the COD removal efficiency reached the same result of 48% as in the directly bioprocess after 48 hours of reaction without the pretreatment by AOPs. The combined use of Fenton reagent in US and UV pretreatment process can increase the final COD removal efficiency of the following bioprocess.