环境温度下DASB预处理脱墨废水的研究

降流式厌氧污泥床反应器(DASB)作为一种新型厌氧处理工艺,具有生物截留能力强、泥水混合效果好、运行管理方便、性能可靠等优点。采用DASB对造纸脱墨废水进行预处理,研究了其影响因素和水解酸化效果。试验结果表明,pH值、HRT和容积负荷对DASB的运行效果有一定的影响,当出水pH值为7.0～7.2、HRT为22.4 h、容积负荷为2.15 kg/(m3.d)时,运行效果最好;在最佳运行条件下,当进水BOD5/COD值在0.38左右时,出水BOD5/COD值可提高到0.50左右,脱墨废水的可生化性大大提高。

Deinking Wastewater Pre-treatment by DASB at Environmental Temperature

Downflow anaerobic sludge blanket(DASB) reactor is a new type of anaerobic reactor which has many advantages such as strong bio-retention ability,good mixing effect of wastewater and sludge,convenient operation and management and reliable performance.DASB was used in deinking wastewater pretreatment.The operation impact factors of deinking wastewater treatment by DASB and hydrolysis acidification were studied.The results showed that the pH,HRT and volumetric loading were linked to DASB operation efficiency.The best operation efficiency was achieved at the effluent pH of 7.0 to 7.2,HRT of 22.4 h and volumetric loading of 2.15 kg/(m3·d).Under the optimum operation condition,the effluent BOD5/COD could be increased to around 0.50 when the influent BOD5/COD was around 0.38.After DASB pretreatment,the biodegradability of deinking wastewater improved greatly.