AI Article Synopsis
- * Using straw as a substrate to create a straw-microalgae biofilm significantly increased ammonia nitrogen removal rates by 28.8% compared to systems without straw.
- * The study suggests that straw not only aids in bacteria growth but also enhances CO fixation, leading to a more effective treatment process for high-ammonia nitrogen wastewater.
Article Abstract
Microalgae as a promising approach for wastewater treatment, has challenges in directly treating digested piggery wastewater (DPW) with high ammonia nitrogen (NH-N) concentration. To improve the performance of microalgae in DPW treatment, straw was employed as a substrate to form a straw-microalgae biofilm. The results demonstrated that the straw-microalgae biofilm achieved the highest NH-N removal rate of 193.2 mg L d, which was 28.8 % higher than that of culture system without straw. The final NH-N concentration in the effluent met the discharge standard of 5 mg L. Furthermore, the total organic carbon (TOC) released from straw facilitated bacterial proliferation and the secretion of extracellular polymeric substances (EPS). The EPS and TOC increased the suspension viscosity and surface tension, thereby enhancing the residence time of CO in the liquid phase and promoting CO fixation. This study presented a novel method for the biological treatment of high-ammonia-nitrogen DPW.
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| http://dx.doi.org/10.1016/j.biortech.2024.131406 | DOI Listing |
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