UF-两段厌氧处理茶多酚废水的研究

采用前置超滤膜(UF)的两相厌氧工艺对原水COD为18362.6mg/L,荼多酚为3608.3mg/L、色度为2624.2倍的茶多酚生产废水进行为期90d的实验研究.结果表明,当实验压力为0.2Mpa时,膜组件对COD去除率为63.4%,茶多酚去除率为95.1%,色度去除率为93.4%.然后,对两相厌氧工艺的投配率、P含量和酸化段水力停留时间(HRT1)对废水COD、色度与茶多酚去除率和产气率的影响进行了研究.当投配率为15.0%、P含量为38.1mg/L、HRT1=24h,该工艺达到最佳处理效果,出水COD为1288.1mg/L,COD去除率为80.8%,色度为95.6倍,色度去除率为44.6%,残余茶多酚为119.8mg/L,茶多酚去除率为32.3%,产气率为0.85m3/kg COD,与未采用UF预处理的两相厌氧水解工艺相比,COD、色度和荼多酚去除率分别提高23.40%,10.2%和1613%,产气率增加0.15m3/kg COD.

ULTRAFILTRATION/TWO-PHASE ANAEROBIC PROCESS FOR TREATING TEA PLOYPHENOLS WASTEWATER

In order to improve the performance of the anaerobic treatment of wastewater from tea polyphenol production,a two-phase anaerobic process with preceding ultrafiltration(UF) membrane was used to treat tea polyphenol wastewater with COD concentration of 18362.6mg/L,tea polyphenol concentration of 3608.3mg/L and chroma of 2624.2 times,for a period of 90 days.The results indicated that with the use of the UF membrane module under an operation pressure of 0.2Mpa the removal rates of COD,tea polyphenol and chroma were 63.4%,95.1% and 93.4%,respectively.The effects of inlet ratio,phosphorous concentration and HRT1(hydraulic retention time) of the hydrolytic acidification phase in the two-phase anaerobic process on the removal rates of COD,chroma and tea polyphenol and methane emission ratio were also investigated.When the inlet ratio was 15.0%,phosphorous concentration was 38.1mg/L and HRT1 was 24h,optimal performance of the process was achieved,which produced an effluent with COD of 1288.1mg/L,tea polyphenol concentration of 119.8mg/L and chroma of 95.6 times,respectively.The removal rates of COD,chroma and tea polyphenol were 80.8%,44.6% and 32.3%,respectively,and the methane emission ratio was 0.85m3/kgCOD.In comparison with the two-phase anaerobic process without UF pretreatment,the removal rates of COD,chroma and tea polyphenol were improved by 23.4%,10.2% and 16.3%,respectively,and the methane emission ratio was increased by 0.15m3/kgCOD.