WANGGeng,ZHANJie,WANGTao,et al.Effect of Calcium Peroxide Tablets Combined with Nitrogen Removal Bacterial Agent on Remediation of Black and Odorous Water[J].China Water & Wastewater,2022,38(21):30-38.
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Effect of Calcium Peroxide Tablets Combined with Nitrogen Removal Bacterial Agent on Remediation of Black and Odorous Water

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第21期 Page: 30-38 Column: Date of publication: 2022-11-01
Author(s):
WANG　Geng1;  ZHAN　Jie2;  WANG　Tao1;  LIAO　Jia?lin1;  HUANG　Zhen?xing1; 3;  RUAN　Wen?quan1; 3
（1. Jiangsu Key Laboratory of Anaerobic Biotechnology， School of Environmental & Civil Engineering， Jiangnan University， Wuxi 214122， China； 2. Wuxi Hengcheng Water Conservancy Engineering Construction Co. Ltd.， Wuxi 214000， China； 3. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment， Suzhou 215009， China）
Keywords:
black and odorous water;  slow-release oxygen material;  calcium peroxide (CaO2);  nitrogen removal bacteria agent;  microorganisms
Abstract:
Calcium peroxide tablets (CPT) with slow-release oxygen function was prepared by embedding calcium peroxide (CaO2) in polyvinyl alcohol (PVA) with biochar as packing medium, and was applied to supply oxygen for black and odorous water. The effects of three CaO2 dosing strategies on sediment-water system were compared, and the remediation performance of CPT combined with heterotrophic nitrifying and aerobic denitrifying bacteria agent BT1 on black and odorous water was investigated. Compared with powder coating and suspension sediment injection, CPT could significantly prolong the oxygen supply time and effectively alleviate the impact of oxygen release process on the water pH. Under the action of CPT, the biodegradation capacity of the sediment was increased by up to 3.88 times compared with the initial level. On day 40, the TP removal rate in overlying water reached 90.6%, and the proportion of calcium-bound phosphorus in sediment was increased to 31%. CPT combined with BT1 accelerated the removal of NH4+-N and TN in overlying water, and the removal rates of organic matter and total transferable nitrogen in sediment were increased to 12.2% and 17.6%, respectively. The copy numbers of AOA_amoA and AOB_amoA genes in sediment reached 2.72 and 10.92 times of that in the initial sediment, respectively. The influence of CPT led to an overall increase trend of nirS gene copy number. In addition, the addition of BT1 significantly increased the nirK gene copy number in sediment to 4.54×105 copies/g on day 10, which promoted the denitrification in the early stage of the experiment.
Last Update: 2022-11-01