摘要
生物除磷效率受限于进水碳源不足,本工作探究了剩余污泥(ES)厌氧发酵液对生物除磷性能的影响,并通过污泥特征及典型周期内营养盐的变化、关键酶活性揭示ES发酵液强化生物除磷的机制。结果表明,发酵液能强化生物除磷,且与乙酸钠相比较,发酵液对SOP的去除能力更强。在阶段Ⅲ,溶解性磷酸盐(SOP)的去除效率高达96.2%~97.8%,高于阶段Ⅰ。添加ES发酵液时,出水COD的浓度低至13.5~16.2 mg/L,最高胞外聚合物(EPS)含量为75.6 mg/g,其中蛋白质和多糖的含量分别为38.6 mg/g和13.4 mg/g,高于未添加发酵液和乙酸钠为碳源的阶段。发酵液内溶解性有机质的多样性提高了关键酶活性,关键酶活性分析在阶段Ⅲ内与生物相关关键酶的活性均高于其他阶段。本研究工作对ES发酵液再利用与水体中磷酸盐的去除提供一定的理论指导与数据支撑。
The efficiency of biological phosphorus removal is limited by the lack of influent carbon source. In this work, the effect of excess sludge(ES) anaerobic fermentation broth on biological phosphorus removal performance was investigated, and the mechanism of enhanced biological phosphorus removal by ES fermentation broth was revealed through sludge characteristics, nutrient changes in typical cycles and key enzyme activities. The results showed that the fermentation broth could enhance biological phosphorus removal, and the removal ability of SOP was stronger than that of sodium acetate. In stage Ⅲ, the removal efficiency of soluble orthophosphate(SOP) was as high as 96.2%~97.8%, which was higher than that in stage Ⅰ. When ES fermentation broth was added, the concentration of COD in effluent was as low as 13.5~16.2 mg/L, and the maximum content of extracellular polymer(EPS) was 75.6 mg/g, in which the contents of protein and polysaccharide were 38.6 mg/g and 13.4 mg/g,respectively, which was higher than the stage without fermentation broth and sodium acetate as carbon source. The diversity of dissolved organic matter in the fermentation broth improved the key enzyme activities. The activities of key enzymes related to biology in stage Ⅲ were higher than those in other stages. This research work provides some theoretical guidance and data support for the reuse of ES fermentation broth and the removal of phosphate in water.
作者
王英
姚宏
WANG Ying;YAO Hong(Department of Architectural Engineering,Shanxi Vocational and Technical College,Taiyuan 030006,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2023年第2期98-101,106,共5页
Technology of Water Treatment
基金
国家自然科学基金(51908029)。
关键词
发酵液
生物除磷
胞外聚合物
关键酶活性
hydrolysate
biological phosphorus removal
extracellular polymer
key enzyme activity
