Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu College of Water Treatment Technology and Material Collaborative Innovation Center, Suzhou, 215009, China.
Chemosphere. 2021 Oct;280:130721. doi: 10.1016/j.chemosphere.2021.130721. Epub 2021 Apr 30.
Poor effect of contaminants removal efficiency and low organic matter content of activated sludge are common in wastewater treatment plants (WWTPs) in China due to the low-strength wastewater. An anaerobic-anoxic-oxic (AAO) and an adsorption/AAO (A/AAO) combined system were established simultaneously to conduct a comparative study for realizing the conversion of carbon source in influent and the enrichment and recovery of proteins and amino acids through the assimilation of ammonia nitrogen. The experimental results showed that 63.5% of the organic matter in influent was adsorbed and flocculated in adsorption process, and the removal rates of chemical oxygen demand, total nitrogen and total phosphorus in A/AAO process were 88.7%, 77.1%, and 93.0% respectively, which were remarkably better than those in AAO process owing to the addition of improved carbon source. Ammonia assimilation rate of A/AAO process was 26.7% higher than that of AAO process, which implied that the ammonia used to synthesize sludge protein was prominently increased. Furthermore, intracellular proteins and amino acids in A/AAO process were 20% higher than those of AAO process, and the quality was equivalent with fish meal or soybean meal as feed. In addition, the microbial community analysis based on 16S rDNA was conducted. Dechloromonas, Zoogloea, Nitrospira, and Flavobacterium were the main genera, and played important roles in nutrient removal and ammonia nitrogen assimilation. The integration of adsorption process was significant to low-strength wastewater treatment and the improvement of excess sludge quality, which is a prospective inspiration for the resource recovery-based wastewater treatment process.
由于进水水质浓度低，中国大部分污水处理厂存在污染物去除效率差和活性污泥中有机物含量低的问题。本研究同步构建了厌氧-缺氧-好氧（AAO）和吸附-AAO（A/AAO）联合系统，旨在通过氨氮同化作用实现进水碳源转化和蛋白质及氨基酸的富集回收。实验结果表明，吸附过程中 63.5%的有机物被吸附和絮凝，A/AAO 工艺对化学需氧量、总氮和总磷的去除率分别为 88.7%、77.1%和 93.0%，明显优于 AAO 工艺，这归因于外加了改良碳源。A/AAO 工艺的氨同化率比 AAO 工艺高 26.7%，这表明用于合成污泥蛋白的氨明显增加。此外，A/AAO 工艺中的细胞内蛋白质和氨基酸比 AAO 工艺高 20%，其质量与鱼粉或豆粕相当，可作为饲料。此外，基于 16S rDNA 的微生物群落分析表明，脱氯菌属、动胶菌属、硝化螺旋菌属和黄杆菌属是主要的功能菌属，在营养物质去除和氨氮同化中发挥着重要作用。吸附工艺的集成对低浓度废水处理和剩余污泥质量的提高具有重要意义，为基于资源回收的污水处理工艺提供了新的思路。
