School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China; CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, PR China.
Bioresour Technol. 2022 Nov;363:127897. doi: 10.1016/j.biortech.2022.127897. Epub 2022 Sep 6.
Effective removal of nitrogen from coking wastewaters is a great challenge, since conventional biological technologies commonly suffer from concentrated bio-toxic components such as phenolic compounds and thiocyanide (SCN). This study has successfully developed a novel ternary process for efficiently removing nitrogen from a practical coking wastewater, by rationally combined biological pretreatment, Fenton sub-pretreatment and final partial nitrification-denitrification (PN) process. It was noted that the oxic biological pretreatment (OP) could degrade above 80 % of COD and SCN in the wastewater, by adopting the pristine coking wastewater sludge. Fenton sub-pretreatment would further degrade the residual toxic organics and protect the metabolic activity of nitrobacteria and denitrobacteria, realizing the efficient removal of NH-N and TN that occurred in the final PN process with self-cultivated sludge. This work can provide an interesting strategy by rationally combining biological-physicochemical processes for nitrogen removal in toxic industrial wastewaters.
有效去除焦化废水中的氮是一项巨大的挑战，因为传统的生物技术通常会受到高浓度的生物毒性成分的影响，如酚类化合物和硫氰酸盐（SCN）。本研究成功开发了一种新型的三元工艺，通过合理组合生物预处理、芬顿亚预处理和最终的部分硝化-反硝化（PN）工艺，有效地去除实际焦化废水中的氮。研究结果表明，好氧生物预处理（OP）可以采用原始焦化废水污泥，将废水中超过 80%的 COD 和 SCN 降解。芬顿亚预处理将进一步降解残留的有毒有机物，并保护硝化菌和反硝化菌的代谢活性，实现最终 PN 过程中自养污泥对 NH-N 和 TN 的高效去除。这项工作为有毒工业废水中的氮去除提供了一种有趣的策略，即合理组合生物-物理化学过程。
