XU Zheng,CHEN Yu,HOU Zhi,et al.Treatment Efficiency of Black and Odorous Water Body Sediment with Different Biological Agents[J].China Water & Wastewater,2021,37(1 1):102-108.
Treatment Efficiency of Black and Odorous Water Body Sediment with Different Biological Agents
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
1 1
Page:
102-108
Column:
Date of publication:
2021-01-01
- Keywords:
- black and odorous water body; biodegradation; sediment stabilization; ectopic treatment; microbial community
- Abstract:
- At present, chemical or biological methods are usually employed for ectopic treatment of black and odorous water sediment. Biological method is widely applied because of its simplicity and low treatment cost, and it is beneficial to the subsequent utilization of sediment. In order to investigate a suitable biological treatment process and demonstrate the variations of microbial community during the biological treatment process, four types of biological agents (nitrifying bacteria, denitrifying bacteria, photosynthetic bacteria, and bacillus) were used for ectopic treatment of black and odorous water sediment. Different dosages of biological agents were added, and variations of total nitrogen (TN), total phosphorus, organic matter and water content in the sediment before and after the reaction were compared. After treatment of 30 days at room temperature (20±5) ℃, water content, total nitrogen, and organic matter in the sediment all decreased to different degrees. Among them, the denitrifying bacteria group with dosage of 35 mg/L had the best treatment efficiency: removal efficiencies of total nitrogen and organic matter reached 59.90% and 20.93%, respectively. Three-dimensional fluorescence spectrum analysis showed that the concentration of macromolecular organic matter in the sediment decreased and the concentration of small molecular matter increased in different degree after adding pure biological agent. This indicated that the biological agents improved the activity of microorganisms in the sediment, not only promoting the degradation of organic matter, but also providing carbon source for denitrification and promoting the removal of total nitrogen in the sediment. Furthermore, highthroughput sequencing also showed that Thiobacillus, Sulfurovum, Sulfuricurvum and Sulfurimonas were observed in all experimental groups with addition of biological agents, and the higher proportions in experimental groups with addition of bacillus and photosynthetic bacteria (total proportions of the four genera reaching 13.24% and 14.80%, respectively) were detected. These four genera were related to sulfur metabolism and might play an important role in the degradation of organics, such as proteins, in the sediment.
Last Update:
2021-01-01