Fine-tuning key parameters of an integrated reactor system for the simultaneous removal of COD, sulfate and ammonium and elemental sulfur reclamation

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• 作者：Ye Yuan^a ; ^{yuanye_19840915@163.com" class="auth_mail} ; ^{yuanye_19840915@aliyun.com" class="auth_mail} ; Chuan Chen^a ; ^{echo110244@126.com" class="auth_mail} ; Bin Liang^a ; ^{liangbin1214@163.com" class="auth_mail} ; Cong Huang^a ; ^{hengyue5257@163.com" class="auth_mail} ; Youkang Zhao^a ; ^{zhaoyoukang@gmail.com" class="auth_mail} ; Xijun Xu^a ; ^{xuxijun3220@sina.com" class="auth_mail} ; Wenbo Tan^a ; ^{tanwenbo1@163.com" class="auth_mail} ; Xu Zhou^a ; ^{x.zhou@awmc.uq.edu.au" class="auth_mail} ; Shuang Gao^a ; ^{localinna.1990@163.com" class="auth_mail} ; Dezhi Sun^a ; ^{sundezhi@bjfu.edu.cn" class="auth_mail} ; DuuJong Lee^a ; ^b ; ^{djlee@ntu.edu.tw" class="auth_mail} ; Jizhong Zhou^c ; ^d ; ^e ; ^{jzhou@ou.edu" class="auth_mail} ; Aijie Wang^a ; ^{waj0578@hit.edu.cn" class="auth_mail}
• 关键词：Sulfate reduction and organic carbon removal ; Denitrifying sulfide removal ; Elemental sulfur production ; Aerated nitrification ; Sulfur reclamation
• 刊名：Journal of Hazardous Materials
• 出版年：30 March, 2014
• 年：2014
• 卷：269
• 期：Complete
• 页码：56-67
• 全文大小：2038 K

文摘

In this paper, we proposed an integrated reactor system for simultaneous removal of COD, sulfate and ammonium (integrated C-S-N removal system) and investigated the key parameters of the system for a high level of elemental sulfur (S⁰) production. The system consisted of 4 main units: sulfate reduction and organic carbon removal (SR-CR), autotrophic and heterotrophic denitrifying sulfide removal (A&H-DSR), sulfur reclamation (SR), and aerated filter for aerobic nitrification (AN). In the system, the effects of key operational parameters on production of elemental sulfur were investigated, including hydraulic retention time (HRT) of each unit, sulfide/nitrate (S^{2鈭?/sup>-S/NO₃鈭?/sup>-N) ratios, reflux ratios between the A&H-DSR and AN units, and loading rates of chemical oxygen demand (COD), sulfate and ammonium. Physico-chemical characteristics of biosulfur were studied for acquiring efficient S0 recovery. The experiments successfully explored the optimum parameters for each unit and demonstrated 98% COD, 98% sulfate and 78% nitrogen removal efficiency. The optimum HRTs for SR-CR, A&H-DSR and AN were 12 h, 3 h and 3 h, respectively. The reflux ratio of 3 could provide adequate S2鈭?/sup>-S/NO₃鈭?/sup>-N ratio (approximately 1:1) to the A&H-DSR unit for obtaining maximum sulfur production. In this system, the maximum production of S0 reached 90%, but only 60% S0 was reclaimed from effluent. The S0 that adhered to the outer layer of granules was deposited in the bottom of the A&H-DSR unit. Finally, the microbial community structure of the corresponding unit at different operational stage were analyzed by 16S rRNA gene based high throughput Illumina MiSeq sequencing and the potential function of dominant species were discussed.}