The paper provides a critical comparison between mesophilic and thermophilic anaerobic treatment of PTA wastewater through diagnosis of a case study. Aspects covered are bioavailability, biodegradability, microbial po...The paper provides a critical comparison between mesophilic and thermophilic anaerobic treatment of PTA wastewater through diagnosis of a case study. Aspects covered are bioavailability, biodegradability, microbial population, thermodynamics, kinetics involved and bio-reactor design for PTA wastewater treatment. The results of the case study suggests that one- stage thermophilic anaerobic reactor coupled with coagulation-flocculation pre-treatment unit and an aerobic post treatment unit could be techno-economically viable for PTA wastewater treatment to ensure that the final effluent quality conforms to the international standard. The in-formation emanated from this study could be useful and thought provoking to the professionals and academia in the area of PTA wastewater treatment and can serve as impetus toward the development of research lines in similar problems like the treatment of other petrochemical wastewater such as phenol-con- taining wastewater, benzene/benzoic acid-con- taining wastewater or wastewater from other similar industrial settings.展开更多
为了探究蔬菜渣和蔬菜汁混合后对其厌氧发酵产沼气潜力的影响,并为混合蔬菜渣汁厌氧发酵工程的应用提供合理性的分析与建议。采用批量式的发酵方式,选取白菜渣汁混合物为反应原料,在高温(55±1)℃下,底物质量分数为3%、白菜渣粒径为...为了探究蔬菜渣和蔬菜汁混合后对其厌氧发酵产沼气潜力的影响,并为混合蔬菜渣汁厌氧发酵工程的应用提供合理性的分析与建议。采用批量式的发酵方式,选取白菜渣汁混合物为反应原料,在高温(55±1)℃下,底物质量分数为3%、白菜渣粒径为0.85 mm,其中白菜渣加水的实验组3(白菜渣68.34 g,水331.66 mL接种物的量为120 m L)TS降解率、VS降解率、第2个日产气高峰、最高CH4含量和累积总产气量分别为56.13%、61.06%、525 m L、66.19%和3390 m L,发酵前后pH值分别为7.2和7.6均在产甲烷菌的正常pH范围,结果均优于其他实验组的对应指标。利用100 L的发酵罐对其进行连续搅拌厌氧发酵产沼气的小试放大实验并分析生物群落结构,通过高通量测序发现在纲水平上,古菌主要以甲烷杆菌纲、甲烷微菌纲为主;在属水平上,嗜热弯曲甲烷热杆菌属是反应器中最主要的产甲烷菌(占总菌量的55%~81%),甲烷八叠球菌属是第二主导的产甲烷菌属(占总菌量的16%~42%)。在连续搅拌过程中,甲烷主要由甲烷八叠球菌属利用CO_(2)和H2通过还原CO_(2)产甲烷途径和乙酸产甲烷途径产生,即甲烷八叠球菌属对连续搅拌实验组的甲烷产生起主导作用。展开更多
使用单因素和正交试验设计相结合的方法对培养基配方及培养条件进行优化提高嗜热链球菌AR333的胞外多糖(exopolysaccharides,EPS)产量。获得最佳培养基配方为:脱脂乳粉15%(w/v)、半乳糖1%(w/v)、大豆蛋白胨0.5%(w/v)、磷酸氢二钾0.1%(w...使用单因素和正交试验设计相结合的方法对培养基配方及培养条件进行优化提高嗜热链球菌AR333的胞外多糖(exopolysaccharides,EPS)产量。获得最佳培养基配方为:脱脂乳粉15%(w/v)、半乳糖1%(w/v)、大豆蛋白胨0.5%(w/v)、磷酸氢二钾0.1%(w/v)。最佳培养条件为:接种量3%,40℃,初始p H 6.5,发酵时间16 h。优化后嗜热链球菌AR333的EPS产量可达256.97mg/L,比优化前的产量提高了3.6倍。展开更多
文摘The paper provides a critical comparison between mesophilic and thermophilic anaerobic treatment of PTA wastewater through diagnosis of a case study. Aspects covered are bioavailability, biodegradability, microbial population, thermodynamics, kinetics involved and bio-reactor design for PTA wastewater treatment. The results of the case study suggests that one- stage thermophilic anaerobic reactor coupled with coagulation-flocculation pre-treatment unit and an aerobic post treatment unit could be techno-economically viable for PTA wastewater treatment to ensure that the final effluent quality conforms to the international standard. The in-formation emanated from this study could be useful and thought provoking to the professionals and academia in the area of PTA wastewater treatment and can serve as impetus toward the development of research lines in similar problems like the treatment of other petrochemical wastewater such as phenol-con- taining wastewater, benzene/benzoic acid-con- taining wastewater or wastewater from other similar industrial settings.
文摘为了探究蔬菜渣和蔬菜汁混合后对其厌氧发酵产沼气潜力的影响,并为混合蔬菜渣汁厌氧发酵工程的应用提供合理性的分析与建议。采用批量式的发酵方式,选取白菜渣汁混合物为反应原料,在高温(55±1)℃下,底物质量分数为3%、白菜渣粒径为0.85 mm,其中白菜渣加水的实验组3(白菜渣68.34 g,水331.66 mL接种物的量为120 m L)TS降解率、VS降解率、第2个日产气高峰、最高CH4含量和累积总产气量分别为56.13%、61.06%、525 m L、66.19%和3390 m L,发酵前后pH值分别为7.2和7.6均在产甲烷菌的正常pH范围,结果均优于其他实验组的对应指标。利用100 L的发酵罐对其进行连续搅拌厌氧发酵产沼气的小试放大实验并分析生物群落结构,通过高通量测序发现在纲水平上,古菌主要以甲烷杆菌纲、甲烷微菌纲为主;在属水平上,嗜热弯曲甲烷热杆菌属是反应器中最主要的产甲烷菌(占总菌量的55%~81%),甲烷八叠球菌属是第二主导的产甲烷菌属(占总菌量的16%~42%)。在连续搅拌过程中,甲烷主要由甲烷八叠球菌属利用CO_(2)和H2通过还原CO_(2)产甲烷途径和乙酸产甲烷途径产生,即甲烷八叠球菌属对连续搅拌实验组的甲烷产生起主导作用。
文摘使用单因素和正交试验设计相结合的方法对培养基配方及培养条件进行优化提高嗜热链球菌AR333的胞外多糖(exopolysaccharides,EPS)产量。获得最佳培养基配方为:脱脂乳粉15%(w/v)、半乳糖1%(w/v)、大豆蛋白胨0.5%(w/v)、磷酸氢二钾0.1%(w/v)。最佳培养条件为:接种量3%,40℃,初始p H 6.5,发酵时间16 h。优化后嗜热链球菌AR333的EPS产量可达256.97mg/L,比优化前的产量提高了3.6倍。
