An integrated process of chemical precipitation and sulfate reduction for treatment of flue gas desulphurization wastewater from coal-fired power plant
An integrated process of chemical precipitation and sulfate reduction for treatment of flue gas desulphurization wastewater from coal-fired power plant
复制标题
化学沉淀与硫酸盐还原一体化工艺处理燃煤电厂烟气脱硫废水
DOI：
10.1016/j.jclepro.2019.04.227
复制
发表时间：
2019
影响因子：
11.1
通讯作者：
Zhang Hongguo
中科院分区：
文献类型：
--
作者：
Yan Jia;Yuan Wenhuan;Liu Jian;Ye Weizhuo;Lin Jinlan;Xie Jiahao;Huang Xuan;Gao Shanshan;Xie Jiehui;Liu Shinian;Chen Wenzhong;Zhang Hongguo
燃煤电厂烟气脱硫过程中产生的含硫酸盐、氯化物、金属和难降解有机物的废水，在回用过程中会产生严重的污染和腐蚀问题。采用化学沉淀-硫酸盐还原工艺处理燃煤电厂烟气脱硫废水。在不添加重金属捕集剂和强氧化剂的情况下，采用化学沉淀法对烟气脱硫废水进行预处理，去除了97%的悬浮物。采用3种连续运行的序批式反应器（SBR），分别培养硫酸盐还原菌BY 7、SR 10和SR 3，对预处理后的烟气脱硫废水进行处理对比研究。研究表明，菌株BY 7和SR 10能够适应高盐烟气脱硫废水，具有较高的硫酸盐还原效率（86-94%）、金属去除效率（70-100%）和难降解有机物去除效率（85-95%）。在序批式反应器中，菌株BY 7和SR 10的硫酸盐负荷最高，为0.5 kg SO 42 −/m3·d。除此之外，氯离子和氟离子的去除率分别达到35%和55%，这可能与共沉淀或生物吸附过程有关。烟气脱硫废水中的25种难降解有机物中，有14种经综合处理后可完全去除。作为对烟气脱硫废水胁迫的响应，SBR_BY7和SBR_SR10中的单不饱和脂肪酸丰度增加，并且观察到盐解毒相关基因的表达上调。因此，本研究提供了一种潜在的低成本烟气脱硫废水回用技术，同时去除硫酸盐、难降解有机物、重金属和盐类。
Flue gas desulphurization process in coal-fired power plants, produces wastewater with concentrated sulfate, chloride, metals and refractory organic compounds, which leads to serious pollution and corrosion problem during recycling. In this study, an integrated process of chemical precipitation and sulfate reduction for treatment of coal-fired power plant flue gas desulphurization wastewater was developed. Without additional of heavy metal trapping and strong oxidizing agents, chemical precipitation was performed as pre-treatment for removal of suspended solid (97%) in raw flue gas desulphurization wastewater. Comparison study on treatment of pre-treated flue gas desulphurization wastewater were performed in three parallelly operated sequencing batch reactors, by cultured sulfate reducing bacteria strain BY7, SR10 and SR3, respectively. This study demonstrated that strain BY7 and SR10 sulfate reducing bacteria were able to adapted to high-salinity flue gas desulphurization wastewater, with high efficiencies of sulfate reduction (86–94%), metals (70–100%) and refractory organic compounds removal (85–95%). The highest sulfate loading rate of 0.5 kg SO42−/m3·d was achieved in sequencing batch reactors with strain BY7 and SR10. Besides, a sustainable removal of chloride and fluoride were achieved (about 35% and 55%, respectively), which probably relate to co-precipitation or biosorption processes. Up to 14 out of 25 refractory organic compounds in flue gas desulphurization wastewater could be completely removed after integrated treatment process. As response to flue gas desulphurization wastewater stress, abundance of monounsaturated fatty acids were increased, and upregulated expression of genes related to salt detoxification were observed in SBR_BY7 and SBR_SR10. Therefore, this study provided a potential low-cost flue gas desulphurization wastewater recycling technology with simultaneously removal of sulfate, refractory organic compounds, heavy metal and salts.