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.

燃煤电厂的烟气脱硫过程产生的废水中含有浓硫酸盐，氯化物，金属和难熔的有机化合物，这在回收过程中会导致严重的污染和腐蚀问题。在这项研究中，开发了化学沉淀和硫酸盐还原的综合工艺来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，进行化学沉淀作为预处理，以去除原烟道气脱硫废水中的悬浮固体（97％）。在三个并行操作的分批间歇反应器中，分别通过培养硫酸盐还原菌菌株BY7，SR10和SR3，对预处理的烟气脱硫废水进行了比较研究。这项研究表明，菌株BY7和SR10的硫酸盐还原菌能够适应高盐度烟气脱硫废水，具有较高的硫酸盐还原率（86-94％），金属（70-100％）和难处理的有机物去除效率（ 85–95％）。最高硫酸盐负载率为0.5 kg SO₄ ²⁻ /米³·d是在具有BY7和SR10菌株的批量反应器测序中实现的。此外，实现了氯和氟化物的可持续去除（分别约为35％和55％），这可能与共沉淀或生物吸附过程有关。经过综合处理后，烟道气脱硫废水中的25种难熔有机化合物中最多有14种可以被完全去除。随着对烟气脱硫废水胁迫的响应，单不饱和脂肪酸的含量增加，并且在SBR_BY7和SBR_SR10中观察到与盐解毒相关的基因的表达上调。因此，本研究提供了一种潜在的低成本烟气脱硫废水回收技术，同时去除了硫酸盐，难熔有机化合物，重金属和盐类。