APPLICATION OF ALKALI-HYDROLYZED RESIDUAL OF ACTIVATED SLUDGE AS A DENITRIFICATION CARBON SOURCE FOR TREATING AMMONIA WASTEWATER WITH A LOW C/N RATIO

WANG Kai-le; ZHOU Ji-ti; TIAN Tian; CHEN Jiang-lin

doi:10.13205/j.hjgc.202112005

Volume 39 Issue 12

Mar. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(12): 31-37

WANG Kai-le, ZHOU Ji-ti, TIAN Tian, CHEN Jiang-lin. APPLICATION OF ALKALI-HYDROLYZED RESIDUAL OF ACTIVATED SLUDGE AS A DENITRIFICATION CARBON SOURCE FOR TREATING AMMONIA WASTEWATER WITH A LOW C/N RATIO[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 31-37. doi: 10.13205/j.hjgc.202112005

Citation:

WANG Kai-le, ZHOU Ji-ti, TIAN Tian, CHEN Jiang-lin. APPLICATION OF ALKALI-HYDROLYZED RESIDUAL OF ACTIVATED SLUDGE AS A DENITRIFICATION CARBON SOURCE FOR TREATING AMMONIA WASTEWATER WITH A LOW C/N RATIO[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 31-37. doi: 10.13205/j.hjgc.202112005

Citation:

WANG Kai-le, ZHOU Ji-ti, TIAN Tian, CHEN Jiang-lin. APPLICATION OF ALKALI-HYDROLYZED RESIDUAL OF ACTIVATED SLUDGE AS A DENITRIFICATION CARBON SOURCE FOR TREATING AMMONIA WASTEWATER WITH A LOW C/N RATIO[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 31-37. doi: 10.13205/j.hjgc.202112005

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APPLICATION OF ALKALI-HYDROLYZED RESIDUAL OF ACTIVATED SLUDGE AS A DENITRIFICATION CARBON SOURCE FOR TREATING AMMONIA WASTEWATER WITH A LOW C/N RATIO

doi: 10.13205/j.hjgc.202112005

Key Laboratory of Industrial Ecological and Environmental Engineering of Ministry of Education, Dalian University of Technology, Dalian 116024, China

Received Date: 2021-02-23
Available Online: 2022-03-30
Publish Date: 2022-03-30

Abstract

Abstract

This work investigated the feasibility of using alkali-hydrolyzed residual activated sludge as a denitrification carbon source to treat ammonia wastewater with a low C/N ratio. Batch experimental results showed that, compared to glucose and methanol, the denitrification rate using sludge alkali-hydrolysate was increased by 25.3% and 23.7%, respectively. The optimal parameters for nitrogen removal through denitrification were C/N=5.5, T=35 ℃, initial pH=8, and HRT=5 h. Under this conditions, NO₃^--N was almost completely removed without NO₂^--N accumulated. Subsequently, the sludge alkali-hydrolysate was applied to an A/O process to treat actual ammonia wastewater with a low C/N ratio. The A/O process was operated in continuous mode, and the sludge alkali-hydrolysate was supplemented in the anaerobic tank with an influent C/N ratio of 5.5. The effluent monitoring results showed that the ρ(TN)<15 mg/L, ρ(NH₄⁺-N)<5 mg/L with almost no NO_x^--N accumulation, which all reached the first-level A emission limiting value in Discharge Standard of Pollutants for Municipal Wastewater treatment Plant. This work revealed that the sludge alkali-hydrolysate could be successfully used to treat actual ammonia wastewater with a low C/N ratio, and provided theoretical and practical support for treatment of nitrogen-containing wastewater and utilization of residual sludge.
- waste activated sludge,
- sludge alkalolysis,
- supplementary carbon source,
- ammonia wastewater

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References(21)

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