摘要
采用UV-Fenton氧化-生化法联合处理煤气含酚废水,比较了单独UV-Fenton氧化法、单独生化法和UV-Fenton氧化-生化法联合工艺对煤气含酚废水的处理效果。结果表明,UV-Fenton氧化体系可有效降解含酚废水,但废水完全降解所需的H2O2用量大,处理成本高。煤气含酚废水的BOD5/COD比值较低,直接采用生化处理的效果不理想,通过UV-Fenton氧化预处理可明显提高煤气含酚废水的生物降解性,随着H2O2投加量的增加,废水的BOD5/COD比值逐渐增大,生物降解性明显增强。当UV/Fenton氧化过程H2O2用量为21.6%理论投加量时,采用UV-Fenton氧化-生化法联合工艺可使煤气含酚废水的COD由1 306 mg/L降低至121 mg/L,挥发酚由193.5 mg/L降低至0.43 mg/L,COD和挥发酚均达到国家排放标准。与单纯采用UV-Fenton氧化法相比,联合技术可节约75%的H2O2用量。
Phenolic wastewater was treated by combined process of UV-Fenton oxidation-biological oxidation.Treatment efficiency of phenolic wastewater by single UV-Fenton oxidation,single biological oxidation and combined process were compared.Results indicated that effective degradation of coal-gas phenolic wastewater was observed by UV-Fenton process,but complete degradation of phenolic wastewater need to consume large numbers of H2O2 with high cost,which is uneconomical.Direct biological oxidation cannot efficient treat coal-gas phenolic wastewater due to low ratio of BOD5 /COD.UV-Fenton preoxidation is effective at enhancing biodegradability of coal-gas phenolic wastewater,and the biodegradability of wastewater enhanced obviously with increasing dosage of H2O2 in UV-Fenton preoxidation.When H2O2 was added only 21.6% of stoichiometric calculated quantities,COD would reduce from 1,306 mg/L to 121 mg/L and phenol reduced from 193.5 mg/L to 0.43 mg/L,both COD and phenol of coal-gas phenolic wastewater can satisfy national control standard by combined process of UV-Fenton oxidation-biological oxidation.Experimental results showed that 75% H2O2 were saved by combined process of UV-Fenton oxidation-biological oxidation,comparing with single UV-Fenton process.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第6期163-166,172,共5页
Environmental Science & Technology
基金
湖北省科技攻关计划项目(2007AA301B52)
