School of Environment and Energy, South China University of Technology, Guangdong, Guangzhou 510006, PR China.
School of Environment and Energy, South China University of Technology, Guangdong, Guangzhou 510006, PR China.
Sci Total Environ. 2022 Feb 10;807(Pt 3):151072. doi: 10.1016/j.scitotenv.2021.151072. Epub 2021 Oct 28.
The application of advanced biological treatment technology results in improved coking wastewater (CW) effluent quality at lower material and energy input practiced by wastewater treatment plants. In wastewater treatment, the diversity of biological processes combinations affects the variety of microorganisms and biochemical reactions resulting in effluent quality. Four full-scale CW processes, anaerobic-anoxic-oxic (A/A/O), anoxic-oxic-hydrolytic-oxic (A/O/H/O), anoxic-oxic-oxic (A/O/O), and oxic-hydrolytic-oxic (O/H/O) were compared for their consumption of chemicals and energy, emissions of greenhouse gases, and excess sludge production. A new performance indicator combining the above mentioned parameters was proposed to comprehensively evaluate processes in capacity to CW. The O/H/O process showed stable and reliable operation with minimum chemicals cost and the average energy consumption, whereas A/A/O at its good performance in TN removal required a large amount of alkaline chemicals to maintain stability. Besides, a substantial addition of chemicals in A/A/O results in larger average amounts of inorganic sludge. Also, the A/A/O process with a single aerobic unit appeared to be incapable of energy saving when dealing with CW rich in nitrogen and poor in phosphorus. The process with dual aerobic units can achieve more complete carbon and nitrogen removal, which is related to the sequence of biochemical reactions. Diverse sequence combinations can create variation in HRT and DO, whereby contaminants proceed through distinct channels of degradation. In the comparative analysis of CWPIs, it could be seen that O/H/O is the biological treatment process with the least equivalent energy consumption input at present thus exhibiting promising application in CW treatment. The A/O/O and A/O/H/O combinations are good attempts of development; however, more energy-efficient operation modes have to be further investigated.
先进的生物处理技术的应用可降低污水处理厂的材料和能源投入，从而提高焦化废水（CW）的出水质量。在污水处理中，生物过程组合的多样性会影响微生物和生化反应的多样性，从而影响出水质量。本研究比较了四种全尺寸 CW 工艺（厌氧-缺氧-好氧（A/A/O）、缺氧-好氧-水解-好氧（A/O/H/O）、缺氧-好氧-好氧（A/O/O）和好氧-水解-好氧（O/H/O））的化学品和能源消耗、温室气体排放和剩余污泥产量。提出了一种新的性能指标，结合上述参数对工艺进行综合评价。O/H/O 工艺具有稳定可靠的运行特性，化学药剂成本和平均能耗最低，而 A/A/O 工艺在 TN 去除方面表现良好，但需要大量碱性化学药剂来维持稳定。此外，A/A/O 工艺中大量添加化学药剂会导致无机污泥的平均生成量较大。此外，当处理富含氮和贫磷的 CW 时，具有单一好氧单元的 A/A/O 工艺似乎无法实现节能。具有两个好氧单元的工艺可以实现更完全的碳氮去除，这与生化反应的顺序有关。不同的序列组合可以产生不同的 HRT 和 DO，从而使污染物通过不同的降解通道进行降解。在 CWPIs 的比较分析中，可以看出 O/H/O 是目前生物处理过程中等效能源投入最少的工艺，因此在 CW 处理中具有广阔的应用前景。A/O/O 和 A/O/H/O 组合是很好的发展尝试，但是需要进一步研究更节能的运行模式。
