Effect of fermentation liquid from food waste as a carbon source for enhancing denitrification in wastewater treatment. (February 2016)

• Record Type: Journal Article
• Authors: Zhang, Yongmei; Wang, Xiaochang C.; Cheng, Zhe; Li, Yuyou; Tang, Jialing
• Is Part Of: Chemosphere. Volume 144(2016)
• Page Start: 689
• Page End: 696
• Publication Date: 2016-02
• Subjects: Food waste -- Anaerobic fermentation -- Carbon source -- Denitrification rate -- Denitrification potential; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2015.09.036
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Food wastes were used for anaerobic fermentation to prepare carbon sources for enhancing nitrogen removal in wastewater treatment. Under anaerobic conditions without pH adjustment, the fermentation liquid from food wastes (FLFW) with a high organic acid content was produced at room temperature (25 °C) and initial solid concentration of 13%. Using FLFW as the sole carbon source of artificial wastewater for biological treatment by sequence batch operation, maximized denitrification (with a denitrification rate of VDN = 12.89 mg/gVSS h and a denitrification potential of PDN = 0.174 gN/gCOD) could be achieved at a COD/TN ratio of 6. The readily biodegradable fraction in the FLFW was evaluated as 58.35%. By comparing FLFW with glucose and sodium acetate, two commonly used chemical carbon sources, FLFW showed a denitrification result similar to sodium acetate but much better than glucose in terms of total nitrogen removal, VDN, PDN, organic matter consumption rate (VCOD ) and heterotrophy anoxic yield coefficient (YH ). Highlights: Food waste was used for anaerobic fermentation to prepare carbon sources. Fermentation liquid of high organic acid was used for enhancing denitrification. High denitrification rate and potential were gained with fermentation liquid. Fermentation liquid showed similar denitrification result as sodium acetate.