【摘要】 研究了因HRT或进水有机物浓度变化而改变的有机负荷(OLR)对PTA废水中污染物降解及厌氧微生物群落结构演替规律。试验结果表明,通过缩短HRT来提高OLR(I→Ⅱ及Ⅲ→Ⅳ)会降低COD去除率及甲烷含量,会增加乙酸浓度及产气量。通过升高进水有机物浓度而提高OLR(I→Ⅲ)会略微提高底物去除率,也会显著提高产气量,但不利于废水中苯甲酸(BA)的降解。相同OLR(Ⅱ→Ⅳ)条件下,出水对甲基苯甲酸(PT)浓度会降低,而对苯二甲酸(TA)、乙酸浓度及产气量和甲烷含量均会增加。OLR在这个过程中以2→3→4→3比例变化,会显著降低好氧出水COD浓度,同时,厌氧优势细菌菌群从Chlorobium变为Tepidisphaera,进而与Methanothrix协同促进产甲烷。更多还原

【Abstract】 The effect of OLR variation due to HRT or influent organic concentration on pollutants degradation and anaerobic microbial community structure in PTA wastewater was investigated.Results showed that increasing OLR by shortening HRT (Ⅰ → Ⅱ and Ⅲ → Ⅳ)decreased COD removal and methane content,and increased acetic acid concentration and gas production.Moreover,OLR increase(Ⅰ→Ⅲ)by doubling the concentration of influent organics slightly increased the substrate removal and significantly increased the gas production,but it was not conducive to the degradation of BA.AT the same OLR (Ⅱ→Ⅳ),PT concentration decrease,whereas TA,acetic acid concentration,gas production and methane content increased.OLR changed by 2∶3∶4∶3 in the whole process.The COD concentration of aerobic effluent was significantly reduced,and the dominant anaerobic bacteria changed fromChlorobiumto Tepidisphaera,and then cooperate with Methanothrixto promote methane production.更多还原