Biofilm formation enhancement in anaerobic treatment of high salinity wastewater: Effect of biochar/Fe addition
Biofilm formation enhancement in anaerobic treatment of high salinity wastewater: Effect of biochar/Fe addition
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DOI：
10.1016/j.jece.2021.105603
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发表时间：
2021-05-08
影响因子：
7.7
通讯作者：
Xu, Kai-Qin
中科院分区：
文献类型：
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作者：
Hu, Yong;Shi, Chen;Xu, Kai-Qin
基于生物膜的工艺，如升流式厌氧污泥床（UASB）反应器在处理含盐废水时，面临着因高盐浓度导致颗粒强度和稳定性较低的问题。在本研究中，通过两个平行的实验室规模UASB反应器，考察了添加生物炭/铁对高盐度（10克钠离子/升）废水厌氧处理过程中生物膜形成的影响。在有机负荷率（OLR）为2.5至10克化学需氧量/升/天的情况下，接种生物炭/铁的UASB反应器对可溶性进水有机物的去除效率更高，甲烷产量也更高。接种生物炭/铁的UASB反应器中颗粒污泥的平均悬浮固体（SS）浓度达到21.6克/升，而未接种生物炭/铁的UASB反应器中该浓度为16.4克/升。观察发现，添加生物炭/铁的颗粒污泥中胞外聚合物（EPS）含量较高，为91.1毫克/克挥发性悬浮固体（VSS），平均粒径（D50）为63.2微米。所有这些结果表明，在高盐度条件下添加生物炭/铁能有效促进生物膜的形成。
The application of biofilm-based processes such as up-flow anaerobic sludge blanket (UASB) reactors for saline wastewater treatment faces the problems of low strength and stability of granules cause by high salt concentration. In this study, the effect of biochar/Fe addition on biofilm formation was examined in anaerobic treatment of high salinity (10 g-Na+/L) wastewater with two parallel lab-scale UASBs. Higher removal efficiencies of soluble influent organics and methane production were achieved in the biochar/Fe seeded UASB reactor with an organic loading rate (OLR) ranging from 2.5 to 10 g-COD/L/d. The average SS concentration of the granular sludge in the biochar/Fe seeded UASB reactor reached 21.6 g/L while that in the non-biochar/Fe-seeded UASB one was 16.4 g/L. A higher extracellular polymeric substances (EPS) of 91.1 mg/g-VSS and medium particle size (D50) of 63.2 mu m in the granular sludge with biochar/Fe addition were observed. All these results suggest that biochar/Fe addition can effectively improve biofilm formation under high salinity conditions.