Abstract:Based on the conventional constructed rapid infiltration (CRI) system, the improved CRI system with non-saturated and saturated layers was constructed. The effects of three hydraulic loading cycles (3, 6 and 12h) on the treatment performance of rural domestic wastewater were investigated when corn cob was added as solid carbon source in the saturated layer, and the microbial mechanism was further elucidated. The results showed that the optimal hydraulic loading cycle of the improved CRI system was 6h. Under the optimal hydraulic loading cycle, the average effluent concentrations of chemical oxygen demand (COD), ammonia nitrogen, total nitrogen and total phosphorus were 5.40, 0.91, 5.59 and 0.47mg/L, respectively. The effluent water quality index meets the “Discharge standard of pollutants for municipal wastewater treatment plant (GB 18918-2002)” level A standard. The results of microbiological analyses implied that the removal of COD mainly occurred in the non-saturated layer of the system, and the Proteobacteria and Actinobacteria were the main functional microorganisms involved in the metabolism of organics. Nitrification also occurred in the non-saturated layer, and Nitrospirae was the main nitrifier. Functional microorganism Chloroflexi in the saturated layer could degrade corn cobs and provide sufficient carbon source for denitrification process, and carry high abundance of key functional genes for denitrification at the same time, facilitating the denitrification process in the saturated layer. This study can not only provide a basis for the resource utilization of agricultural wastes, but also provide technical support for the improved CRI system to strengthen the treatment of rural domestic wastewater.
孙启雅, 王林, 李咏梅. 改进型人工快渗系统处理村镇污水效能研究——水力负荷周期的影响[J]. 中国环境科学, 2024, 44(5): 2431-2439.
SUN Qi-ya, WANG Lin, LI Yong-mei. Study on treatment performance of rural wastewater using the improved constructed rapid infiltration system-The influence of hydraulic loading cycle. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2431-2439.
[1] Xu Y, Li H, Li Y, et al. Systematically assess the advancing and limiting factors of using the multi-soil-layering system for treating rural sewage in China:From the economic, social, and environmental perspectives[J]. Journal of Environmental Management, 2022,312:114912. [2] Yang L, Kong F L, Xi M, et al. Environmental economic value calculation and sustainability assessment for constructed rapid infiltration system based on energy analysis[J]. Journal of Cleaner Production, 2017,167:582-588. [3] Zhang Q H, Yang W N, Ngo H H, et al. Current status of urban wastewater treatment plants in China[J]. Environment International, 2016,92-93:11-22. [4] Zhang X, Dou Y, Gao C, et al. Removal of Cd (II) by modified maifanite coated with Mg-layered double hydroxides in constructed rapid infiltration systems[J]. Science of The Total Environment, 2019, 685:951-962. [5] Zhang X, Guo L, Huang H, et al. Removal of phosphorus by the core-shell bio-ceramic/Zn-layered double hydroxides (LDHs) composites for municipal wastewater treatment in constructed rapid infiltration system[J]. Water Research, 2016,96:280-291. [6] 李丽,陆兆华,王昊,等.新型混合填料人工快渗系统处理污染河水的试验研究[J].中国给水排水, 2007,23(11):86-89. Li L, Lu Z H, Wang H, et al. Experimental study on treatment of polluted river water by constructed rapid infiltration system with new-style combined fillers[J]. China Water&Wastewater, 2007,23(11):86-89. [7] 陈佼,张建强,许文来,等.Fe3+对人工快速渗滤系统脱氮效能的影响[J].环境工程学报, 2016,10(12):7057-7062. Chen J, Zhang J Q, Xu W L, et al. Effect of Fe3+on nitrogen removal efficiency in constructed rapid infiltration system[J]. Chinese Journal of Environmental Engineering, 2016,10(12):7057-7062. [8] 谢宇轩.三级人工快渗系统运行及微生物分布特性分析[D].北京:中国地质大学(北京), 2010. Xie Y X. Analysis of the running state and distribution of the microbial strain in the three stages constructed rapid infiltration system[D]. Beijing:China University of Geosciences Beijing, 2010. [9] Jia L, Gou E, Liu H, et al. Exploring utilization of recycled agricultural biomass in constructed wetlands:Characterization of the driving force for high-rate nitrogen removal[J]. Environmental Science&Technology, 2019,53(3):1258-1268. [10] Sun Q, Lin Y, Ping Q, et al. Exploring recycled agricultural wastes for high-rate removal of nitrogen in wastewater:Emphasizing on the investigation of the inner driving force and comparison with conventional liquid carbon sources[J]. Water Research, 2022,226:119292. [11] 孙莹.以廉价农业废弃物为缓释碳源的反硝化滤池深度脱氮研究[D].哈尔滨:哈尔滨工业大学, 2015. Sun Y. Advanced nitrogen removal of denitrification filter with agricultural residue as sustained-release carbon[D]. Harbin:Harbin Institute of Technology, 2015. [12] 赵方超.以木屑为补充碳源的人工湿地处理低碳氮比污水的效能研究[D].西安:长安大学, 2017. Zhao F C. Treatment of low C/N wastewater in constructed wetland using woodchips as carbon source[D]. Xi'an:Chang'an University, 2017. [13] 于东升.人工快速渗滤系统处理城市初雨径流污染试验研究[D].西安:西安建筑科技大学, 2017. Yu D S. Experimental study on artificial rapid infiltration system treating urban initial runoff pollution[D]. Xi'an:Xi'an University of Architecture and Technology, 2017. [14] 王波.人工快速渗滤污水处理技术[C]."十三五"水污染治理实用技术, 2017:108-113. Wang B. constructed rapid infiltration sewage treatment technology[C]. "13th Five-Year" water pollution control practical technology, 2017:108-113. [15] Noguchi H, Park J, Takagi T, et al. MetaGene:prokaryotic gene finding from environmental genome shotgun sequences[J]. Nucleic Acids Research, 2006,34(19):5623-5630. [16] Fu L M, Niu B F, Zhu Z W, et al. CD-HIT:accelerated for clustering the next-generation sequencing data[J]. Bioinformatic, 2012,28(23):3150-3152. [17] Altschul S F, Madden T L, Schffer A A, et al. Gapped BLAST and PSI-BLAST:a new generation of protein database search programs[J], Nucleic Acids Research, 1997,25(17):3389-402. [18] Zya B, Qi Z A, Hs A, et al. Metagenomic analyses of microbial structure and metabolic pathway in solid-phase denitrification systems for advanced nitrogen removal of wastewater treatment plant effluent:A pilot-scale study[J]. Water Research, 2021,196:117067. [19] GB3838-2002地表水环境质量标准[S]. GB3838-2002 Environmental quality standards for surface water[S]. [20] GB 18918-2002城镇污水处理厂污染物排放标准[S]. GB 18918-2002 Discharge standard of pollutants for municipal waste-water treatment plant[S]. [21] 李兵,许文来.CRI系统氨氮和有机物降解机理研究[J].环境与发展, 2017,29(6):139,141. Li B, Xu W L. Study on degradation mechanism of ammonia nitrogen and organic compounds in CRI system[J]. Environment and Development, 2017,29(6):139,141. [22] 杨绍平,梁敏,王靖岚,等.加拿大改良CRI工艺防治流域污染借鉴[J].四川水利, 2022,43(2):148-151. Yang S P, Liang M, Wang J L, et al. Canada's improved CRI process to prevent and control watershed pollution[J]. Sichuan Water and Resources, 2022,43(2):148-151. [23] 王明超.强化人工快速渗滤系统处理乡镇生活污水技术及其应用研究[D].北京:中国地质大学(北京), 2017. Wang M C. Study on the technology and application of domestic sewage treatment by a strengthened constructed rapid infiltration system[D]. Beijing:China University of Geosciences Beijing, 2017. [24] 高明刚,童山原,钟振兴,等.CRI处理氧化沟出水的效果及菌群分析[J].中国给水排水, 2020,36(5):91-97. Gao M G, Tong S Y, Zhong Z X, et al. Performance and bacterial communities of constructed rapid infiltration (CRI) treating oxidation ditch effluent[J]. China Water&Wastewater, 2020,36(5):91-97. [25] 何强,胡书山,向泽毅,等.垂直流人工湿地系统净化污水厂尾水脱氮效果[J].中国环境科学, 2023,43(8):3956-65. He Q, Hu S S, Xiang Z E, et al. Study on the nitrogen removal ability of vertical flow constructed wetland treating tailwater of sewage plant[J]. China Environmental Science, 2023,43(8):3956-3965. [26] 陈俊敏,刘方,付永胜,等.人工快速渗滤系统脱氮机理试验研究[J].水处理技术, 2009,35(2):32-34,57. Chen J M, Liu F, Fu Y S, et al. Experimental study on the mechanism of nitrogen removal in artificial rapid infiltration systems[J]. Technology of Water Treatment, 2009,35(2):32-34,57. [27] 苗雅琴,朱卫红,沈昱廷,等.生物炭添加对人工湿地氨气排放的影响及微生物群落组装机制研究[J].中国环境科学, 2024,https://doi.org/10.19674/j.cnki.issn1000-6923.20240229.003. Miao Y Q, Zhu W H, Shen Y T, et al. Study on the effect of biochar addition on ammonia emission from constructed wetlands and the mechanism of microbial community assembly[J]. China Environmental Science, 2024,https://doi.org/10.19674/j.cnki.issn1000-6923.20240229.003. [28] 王沐晴,卞兆勇,张丹丹,等.工艺参数对CRI削减雨水径流中氮磷污染物的影响[J].净水技术, 2021,40(10):122-130. Wang M Q, Bian Z Y, Zhang D D, et al. Effect of technological parameters on nitrogen and phosphorus pollutants reduction in stormwater runoff by CRI process[J]. Water Purification Technology, 2021,40(10):122-130. [29] 刘素玮,张铁坚,刘俊良.人工快速渗滤系统对降雨径流净化效果研究[J].水处理技术, 2023,49(10):19-24. Liu S W, Zhang T J, Liu J L. Study on the purification effect of artificial rapid perfiltration system on rainfall runoff[J]. Technology of Water Treatment, 2023,49(10):19-24. [30] 曾涛涛,蒋小梅,韩科昌,等.生活污水处理厂微生物群落结构解析[J].安全与环境学报, 2018,18(2):697-703. Zeng T T, Jiang X M, Han K C, et al. Analysis of microbial community structure in domestic sewage treatment plants[J]. Journal of Safety and Environment, 2018,18(2):697-703. [31] Jia L, Liu H, Kong Q, et al. Interactions of high-rate nitrate reduction and heavy metal mitigation in iron-carbon-based constructed wetlands for purifying contaminated groundwater[J]. Water Research, 2020,169:115285. [32] 周帅峰,刘源,张圣昊,等.不同化学药剂对人工湿地基质堵塞的缓解效果与机理[J].中国环境科学, https://doi.org/10.19674/j.cnki.issn1000-6923.20231211.006. Zhou S F, Liu Y, Zhang S H, et al. Effect and mechanism of different chemical agents on substrate clogging mitigation in constructed wetlands[J]. China Environmental Science, https://doi.org/10.19674/j.cnki.issn1000-6923.20231211.006. [33] Jiang X, Wang H, Wu P, et al. Nitrification performance evaluation of activated sludge under high potassium ion stress during high-ammonia nitrogen organic wastewater treatment[J]. Journal of Environmental Sciences, 2022,111:84-92. [34] Wang R, Zhao X, Wang T, et al. Can we use mine waste as substrate in constructed wetlands to intensify nutrient removal?A critical assessment of key removal mechanisms and long-term environmental risks[J]. Water Research, 2022,210:118009. [35] Jia L, Li C, Zhang Y, et al. Microbial community responses to agricultural biomass addition in aerated constructed wetlands treating low carbon wastewater[J]. Journal of Environmental Management, 2020,270:110912. [36] 赵远哲,杨永哲,王海燕,等.新型填料A/O生物滤池处理低碳氮比农村污水脱氮[J].环境科学, 2020,41(5):2329-2338. Zhao Y Z, Yang Y Z, Wang H Y, et al. Nitrogen removal in low-C/N rural sewage treatment by anoxic/oxic biofilter packed with new types of fillers[J]. Environmental Science, 2020,41(5):2329-2338. [37] Cai W, Huang W, Lei Z, et al. Granulation of activated sludge using butyrate and valerate as additional carbon source and granular phosphorus removal capacity during wastewater treatment[J]. Bioresource Technology, 2019,282:269-274. [38] 王晓曈,杨宏,苏杨,等.生物滤池快速启动ANAMMOX运行策略及菌群特征[J].环境科学, 2020,41(7):3345-3355. Wang X T, Yang H, Su Y, et al. Fast start-up ANAMMOX operation strategy and flora characteristics of a biofilter[J]. Environmental Science, 2020,41(7):3345-3355. [39] 孙佳成.改良型人工快速渗滤系统脱氮途径和机理研究[D].桂林:广西师范大学, 2022. Sun J C. Study on nitrogen removal pathway and mechanism of improved constructed rapid infiltration system[D]. Guilin:Guangxi Normal University, 2022. [40] Chu L, Wang J. Denitrification of groundwater using PHBV blends in packed bed reactors and the microbial diversity[J]. Chemosphere, 2016,155:463-470. [41] 江肖良,李孟,张少辉,等.4种不同工况生物滤池净化效能与微生物特性分析[J].环境科学, 2018,39(12):5503-5513. Jiang X L, Li M, Zhang S H, et al. Purification efficiency and microbial characteristics of four biofilters operated under different conditions[J]. Environmental Science, 2018,39(12):5503-5513. [42] Tan X, Yang Y L, Liu Y W, et al. Quantitative ecology associations between heterotrophic nitrification-aerobic denitrification, nitrogen-metabolism genes, and key bacteria in a tidal flow constructed wetland[J]. Bioresource Technology, 2021,337:125449. [43] 陈希,胡彬,张瑞峰,等.表观气速对除磷污泥颗粒化性能及代谢特征的影响[J].中国环境科学, 2024,44(2):686-98. Chen X, Hu B, Zhang R F, et al. Study on the effect of superficial gas velocity on the granulation and metabolic characteristics of phosphorus removal sludge[J]. China Environmental Science, 2024, 44(2):686-698.