Effect of oyster shell medium and organic substrate on the performance of a particulate pyrite autotrophic denitrification (PPAD) process
Effect of oyster shell medium and organic substrate on the performance of a particulate pyrite autotrophic denitrification (PPAD) process
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DOI：
10.1016/j.biortech.2017.07.109
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发表时间：
2017-11-01
影响因子：
11.4
通讯作者：
Ergas, Sarina J.
中科院分区：
文献类型：
--
作者：
Tong, Shuang;Stocks, Justine L.;Ergas, Sarina J.
与硫氧化反硝化相比，黄铁矿作为电子供体用于生物反硝化具有减少碱度消耗和硫酸盐副产物产生的潜力。研究了牡蛎壳和有机基质添加对颗粒状硫铁矿自养反硝化（PPAD）过程性能的影响。并排的实验室规模的研究进行了上流式填充床生物反应器与黄铁矿和沙子，有和没有牡蛎壳作为碱度源。有机碳的添加（10%的废水体积）被发现，以提高PPAD反硝化性能，可能是通过促进兼养代谢。添加有机碳后，在6小时的空床接触时间，总无机氮（TIN）去除达到90%的柱与牡蛎壳相比，70%没有。SEM图像和生物膜蛋白测量表明，牡蛎壳促进生物膜生长。结果表明，PPAD是一种很有前途的硝化废水处理技术。
The use of pyrite as an electron donor for biological denitrification has the potential to reduce alkalinity consumption and sulfate by-product production compared with sulfur oxidizing denitrification. This research investigated the effects of oyster shell and organic substrate addition on the performance of a particulate pyrite autotrophic denitrification (PPAD) process. Side-by-side bench-scale studies were carried out in upflow packed bed bioreactors with pyrite and sand, with and without oyster shells as an alkalinity source. Organic carbon addition (10% by volume wastewater) was found to improve PPAD denitrification performance, possibly by promoting mixotrophic metabolism. After organic carbon addition and operation at a six-hour empty bed contact time, total inorganic nitrogen (TIN) removal reached 90% in the column with oyster shells compared with 70% without. SEM images and biofilm protein measurements indicated that oyster shells enhanced biofilm growth. The results indicate that PPAD is a promising technology for treatment of nitrified wastewater.