Nitrite accumulation stability evaluation for low-strength ammonium wastewater by adsorption and biological desorption of zeolite under different operational temperature

被引：31
作者：
Chen, Zhenguo [1 ,2 ,3 ]
Zheng, Xuwen [2 ]
Chen, Yongxing [2 ]
Wang, Xiaojun [2 ,3 ,4 ]
Zhang, Lijuan [1 ]
Chen, Haochuan [2 ,3 ]
机构：
[1] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510641, Guangdong, Peoples R China
[2] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China
[3] Hua An Biotech Co Ltd, Foshan 528300, Peoples R China
[4] Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guangzhou, Guangdong, Peoples R China
来源：
SCIENCE OF THE TOTAL ENVIRONMENT | 2020年 / 704卷
关键词：
Low-strength ammonium; Nitritation; Zeolite; Biofilm; Temperature; Stability; SEQUENCING BATCH REACTOR; BED BIOFILM REACTOR; MICROBIAL COMMUNITY STRUCTURE; PARTIAL NITRIFICATION; NITROGEN REMOVAL; ANAMMOX PROCESS; PERFORMANCE; SEWAGE; RESTORATION; DIVERSITY;
D O I：
10.1016/j.scitotenv.2019.135260
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
How to achieve stable nitrite accumulation was still a huge challenge for low-carbon and energy-saving biological nitrogen removal of low-strength ammonium wastewater. This study proposed a new way to solve this problem with zeolite biological fixed bed (ZBFB) by cycle operation of adsorption and biological desorption. In order to evaluate nitritation performance of this reactor, the influence of operational temperature on nitrite accumulation stability was investigated by 126 cycles operation in four parallel ZBFB reactors for low-strength ammonium wastewater (50 mg/L NH4+-N). It was found that higher operational temperature (i.e., 36.0 degrees C), rather than other temperature (i.e., 27.0 degrees C, 30.0 degrees C, 33.0 degrees C), could maintain stable nitrite accumulation with nitrite production rate of 0.312 kg NO2--N.m(-3) zeolite.day(-1) and nitrite accumulation ratio higher than 95.0% after biological desorption. High-throughput sequencing analysis results showed that bacterial structure significantly changed in ZBFB under different operational temperature, and obvious enrichment of genus Nitrosomonas (AOB) and gradually enhanced free ammonia (FA) inhibition on genus Nitrospira and Nitrobacter (NOB) were found by elevation of operational temperature, leading to different nitrite accumulation performance in ZBFB reactors. The mechanism for stable nitrite accumulation performance by ZBFB might be attributed to overwhelming growth rate of AOB than NOB, faster ammonium desorption and enhanced FA inhibition on NOB under operational temperature (i.e., 36.0 degrees C). All in all, keeping high temperature for biological desorption step should be extremely crucial for stable nitrite accumulation by ZBFB, which could facilitate further low-carbon and energy-saving biological nitrogen removal for low-strength ammonium wastewater treatment. (C) 2019 Elsevier B.V. All rights reserved.
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页数：12
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