School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China.
Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, China.
Bioresour Technol. 2018 May;256:259-268. doi: 10.1016/j.biortech.2018.02.033. Epub 2018 Feb 8.
In this study, nitrogen removal using the lactic acid fermentation products from food waste and other external chemical carbon sources (sodium acetate, sodium lactate and starch) was investigated. Similar to sodium acetate and lactate, the lactic acid-enriched fermentation liquid from food waste (FLFW) exhibited a high denitrification rate (5.5 mg NO-N/(g-VSS h)) and potential (0.16 g NO-N/g COD), and could achieve high NH-N and total nitrogen (TN) removal efficiencies during long-term operation. Using FLFW as supplementary carbon sources reduced the extracellular polymeric substances (EPS) content, improved the settleability and achieved a satisfactory biomass yield of activated sludge. Additionally, the increased microbial metabolic activity and bacterial community diversity and the accumulation of unique bacteria in the activated sludge cultured with FLFW further promoted the organics utilization rate and nitrogen removal efficiency, indicating that the FLFW prepared from solid waste was an ideal carbon source for wastewater treatment.
在这项研究中，使用来自食物垃圾和其他外部化学碳源（乙酸钠、乳酸钠和淀粉）的乳酸发酵产物进行了脱氮研究。与乙酸钠和乳酸盐类似，富含乳酸的食物垃圾发酵液（FLFW）表现出很高的脱氮速率（5.5mgNO-N/（g-VSS·h））和潜力（0.16gNO-N/gCOD），并且在长期运行过程中可以实现高 NH-N 和总氮（TN）去除效率。使用 FLFW 作为补充碳源可以降低胞外聚合物（EPS）含量，改善沉淀性能，并获得令人满意的活性污泥生物量产量。此外，用 FLFW 培养的活性污泥中微生物代谢活性和细菌群落多样性的增加以及特有细菌的积累进一步促进了有机物利用率和氮去除效率，表明从固体废物中制备的 FLFW 是废水处理的理想碳源。
