ZHANGJia-ying,LIUXin-yi,ZHOUJun-cai,et al.Effect of Sodium Lactate and Sodium Acetate as Carbon Sources on Biological Nitrogen Removal[J].China Water & Wastewater,2023,39(19):83-88.
Effect of Sodium Lactate and Sodium Acetate as Carbon Sources on Biological Nitrogen Removal
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第19期
Page:
83-88
Column:
Date of publication:
2023-10-01
- Keywords:
- sodium lactate; sodium acetate; carbon source; biological nitrogen removal; COD; sludge bulking
- Abstract:
- This study compared the differences of nitrogen removal performance and bioavailability between sodium lactate and traditional carbon source sodium acetate in a SBR for the treatment of simulated wastewater. When the influent NH4+-N and COD were 32 mg/L and 200 mg/L respectively, the nitrogen removal performance of sodium acetate was better than that of sodium lactate. When the COD was 300 mg/L, the total nitrogen removal rates of both systems were comparable and reached the highest values of 85.73% and 83.04% respectively. When the COD was 400 mg/L, sodium acetate obviously inhibited the nitrification process, resulting in the total nitrogen removal rate of the system as lower as 56.51%. Conversely, good denitrification performance of the sodium lactate system was obtained. Sludge bulking was observed in both systems during the operation, and the phenomenon was more pronounced in the sodium lactate system. With the increase of COD, the sludge bulking was aggravated and accompanied by sludge agglomeration. The microbial species and their relative abundance were comparable in the two systems, indicating that sodium lactate and sodium acetate as carbon sources had similar bioavailability and good nitrogen removal performances. In the sodium lactate system, Ferruginibacter accounted for a relatively high abundance, indicating that sludge agglomeration and bulking were prone to occur when sodium lactate was employed as the additional carbon sources.
Last Update:
2023-10-01