DUZheng-liang,ZHONGYa,ZHANGHui,et al.Performance of Humus Soil Biochemical System in Treating Rural Wastewater under Low Dissolved Oxygen Conditions[J].China Water & Wastewater,2025,41(7):102-109.
Performance of Humus Soil Biochemical System in Treating Rural Wastewater under Low Dissolved Oxygen Conditions
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第7期
Page:
102-109
Column:
Date of publication:
2025-04-01
- Keywords:
- rural wastewater; nitrogen removal; humus soil biochemical system; low dissolved oxygen; microbial community
- Abstract:
- To address the issues of high aeration requirements and energy consumption associated with the traditional anoxic-oxic (AON) process, a humus soil biochemical system (HSBS) was developed for the treatment of simulated rural wastewater. This study investigated the differences between HSBS and the AON process in terms of pollutant removal efficiency, sludge characteristics, and microbial community. Under low dissolved oxygen conditions (0.3 mg/L to 0.7 mg/L), the HSBS achieved removal efficiencies of 97.1%, 91.2%, and 84.4% for COD, NH4+-N, and TN in wastewater, respectively, with corresponding effluent concentrations of 11.0 mg/L, 3.5 mg/L, and 6.3 mg/L. Compared to the AON process, the TN removal efficiency was enhanced by 12.6%, demonstrating superior treatment performance. The results of high-throughput sequencing revealed that the HSBS exhibited greater microbial community richness and diversity in comparison to the AON process. Notably, several dominant bacterial phyla were identified, including Proteobacteria, Patescibacteria, Chloroflexi, and Bacteroidota. These microorganisms played a crucial role in biochemical nitrogen removal, thereby enhancing the pollutant removal efficiency of the HSBS. The HSBS has the potential to replace AON, offering a technical and theoretical reference for the efficient and low?consumption treatment of rural wastewater.
Last Update:
2025-04-01