The study of dyeing wastewater treatment by using membrane bioreactor

• Main Authors: Han-Ming Chien, 簡漢銘
• Other Authors: Sheng-jie You
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/27149620331801487019

碩士 === 中原大學 === 土木工程研究所 === 94 === In this study, the performance of sequencing batch reactor (SBR), aerobic membrane bioreactor (AMBR), anaerobic-oxic membrane bioreactor (AOMBR) and AOMBR/RO processes treating the synthetic textile dyeing wastewater (Reactive Black 5) was investigated and compared. The microorganisms with high dye-degrading performance were also studied by traditional culturing method. After more than two year process operation, we obtain the average effluent concentration for SBR, AMBR, AOMBR, and AOMBR/RO process. It was observed that the SS of those four processes effluent were 96, 0, 0, and 0 mg l-1, respectively. This revealed that the membrane did retain all particle in the aerobic tank. Furthermore, the COD of those four processes effluent were 133, 95, 37, and 38 mg l-1, respectively. It was found that the anaerobic tank of AOMBR and AOMBR/RO can lower the COD concentration. In addition, the BOD of those four processes effluent were 68, 3, 3, and 0 mg l-1, respectively. For this parameter, the membrane unit also showed an excellent performance. Finally, the true color of those four processes effluent were 548, 513, 196 and 32 ADMI, respectively, revealed that the anaerobic tank and RO unit could achieve higher color removal performance. According the experiment result, all the processes containing membrane unit meet the Taiwan EPA effluent criteria, but only the AOMBR/RO process meets the water reclamation criteria for cooling water usage. The removal performance of these four processes describes in this section. It was obviously found that the processes containing membrane unit performed excellent efficiencies on SS and BOD removal. Additionally, the anaerobic tank can enhance the COD and true color removal, while the RO unit can further remove the true color. In this study, 200 colonies were isolated successful. After DGGE screening, twelve predominant species, i.e. more than 2% of the total colonies, were sequenced and compared with the published species in NCBI. Significantly was observed that the genus Microbacterium, especially the Microbacterium aurum, was the most predominant population in the sludge (70.6 % and 62.8 %). Paenibacillus azoreducens is an endospore-forming bacterium which has already been isolated from textile industry wastewater. It is considered to be an azo-dye-reducing bacterium and could decolorize the azo dye, Remazol Black B, by 98% within 24 hours. Bacillus sp., which is also a kind of endospore-forming bacterium, was already screened and is considered to have the ability to produce azoreductase for dye-decolorization. This study also isolated higher de-color performance microorganisms by using TGE (for total microorganisms isolation), PDA (for both anaerobic and aerobic fungi isolation) and TGC (for anaerobic microorganisms isolation) mediums. The experimental results showed that only 3 isolates performed more than 80% Reactive Black 5 degrading efficiencies by using both TGE and aerobic PDA mediums. On the contrary, no isolate was obtained by using anaerobic PDA mediums, implied that there is no strictly anaerobic fungi in the anaerobic tank. Furthermore, 18 isolates cultured from anaerobic TGC medium showed more than 90% Reactive Black 5 removal efficiency, revealed that the anaerobic tank did enhance the growth of the high de-color microorganisms, especially anaerobic bacteria （18 isolates cultured）.