Coupled pyrite and sulfur autotrophic denitrification for simultaneous removal of nitrogen and phosphorus from secondary effluent: feasibility, performance and mechanisms.

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2023-09-01 DOI:10.1016/j.watres.2023.120422

Zhiqiang Chen, Chao Pang, Qinxue Wen

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引用次数: 4

Abstract

The discharge standards of nitrogen (N) and phosphorus (P) in wastewater treatment plants (WWTPs) have become increasingly strict to reduce water eutrophication. Further reducing N and P in effluent from municipal WWTPs need to be achieved effectively and eco-friendly. In this study, a carbon independent pyrite and sulfur autotrophic denitrification (PSAD) system using pyrite and sulfur as electron donor was developed and compared with pyrite autotrophic denitrification (PAD) and sulfur autotrophic denitrification (SAD) systems through batch and continuous flow biofilter experiments. Compare to PAD and SAD, PSAD was more effective in simultaneous removal in N and P. At hydraulic retention time (HRT) 3 h, average effluent concentrations of total nitrogen (TN) and total phosphate (TP) of 1.40 ± 0.03 and 0.19 ± 0.02 mg/L were achieved when treating real secondary effluent with 20.65 ± 0.24 mg/L TN and 1.00 ± 0.24 mg/L TP. The improvement in simultaneous removal of N and P was attributed to the coupling of PAD and SAD in enhancing the transformation of sulfur and iron and enlarging the reaction zone in the pyrite and sulfur autotrophic denitrification biofilter (PSADB) system. Therefore, more biomass was accumulated and the microbial denitrification functional stability, including electrons transfer and consumption was enhanced on the surface of pyrite and sulfur particles in the PSADB system. Moreover, autotrophic denitrifiers (Thiobacillus and Ferritrophicum), sulfate-reducing bacteria (Desulfocapsa) and iron reducing bacteria (Geothrix), acting as contributors to microbial nitrogen, sulfur and iron cycle, were specially enriched. In addition, the leaching of iron ions was promoted, which facilitated the removal of phosphate in the form of Fe₃(PO₄)₂·8H₂O and Fe₃PO₄. PSADB has proven to be an efficient technology for simultaneous removal of N and P, which could meet increasingly stringent discharge standards effectively and eco-friendly.

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黄铁矿和硫联合自养反硝化同时去除二级废水中的氮和磷:可行性、性能和机制。

为减少水体富营养化，污水处理厂的氮、磷排放标准日益严格。进一步减少城市污水处理厂污水中的氮和磷需要有效和环保地实现。本研究以黄铁矿和硫为电子供体开发了碳不依赖的黄铁矿和硫自养反硝化(PSAD)系统，并通过间歇式和连续流生物滤池实验与黄铁矿自养反硝化(PAD)和硫自养反硝化(SAD)系统进行了比较。与PAD和SAD相比，PSAD对N和p的同时去除效果更好。在水力停留时间(HRT)为3 h时，总氮(TN)和总磷(TP)的平均浓度分别为20.65±0.24 mg/L和1.00±0.24 mg/L，总氮(TN)和总磷(TP)的平均浓度分别为1.40±0.03和0.19±0.02 mg/L。在黄铁矿-硫自养反硝化生物滤池(PSADB)系统中，PAD和SAD的耦合作用增强了硫和铁的转化，扩大了反应区，提高了N和P的同时去除率。因此，在PSADB体系中积累了更多的生物量，并增强了微生物反硝化功能的稳定性，包括黄铁矿和硫颗粒表面的电子转移和消耗。此外，自养反硝化菌(Thiobacillus和ferritrophum)、硫酸盐还原菌(Desulfocapsa)和铁还原菌(Geothrix)作为微生物氮、硫和铁循环的贡献菌也得到了特别的富集。此外，还促进了铁离子的浸出，促进了以Fe3(PO4)2·8H2O和Fe3PO4形式存在的磷酸盐的脱除。PSADB已被证明是一种高效的同时去除N和P的技术，可以有效地满足日益严格的排放标准，并且环保。

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.