Enhancing biological denitrification with adding sludge liquor of hydrolytic acidification pretreated by high-pressure homogenization

Li, Gaopeng; Zhang, Panyue; Wang, Yili; Sheng, Yiqi; Lv, Xiaoxue; Yin, Jun

doi:10.1016/j.ibiod.2016.04.015

Cited by 16 publications

(5 citation statements)

References 37 publications

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“…are first hydrolyzed into dissolved organic matter and then acidified into organic acids, which allow microorganisms to use solid wastes, thus enhancing denitrification. Our previous studies have identified that organics (organic acids and soluble carbohydrates) in the fermentation liquid from food waste (FLFW) are easily biodegradable carbon sources, and could increase microbial diversity and obviously promote the nitrogen removal efficiency (Tang et al, 2017a;Zhang et al, 2016b). In lab-scale sequence batch reactors (SBR) and pilot-scale membrane bioreactor (MBR) systems, FLFW can be effectively utilized as a carbon source for enhancing nitrogen removal during long-term operation (Tang et al, 2017a;Zhang et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…Anaerobic fermentation is a suitable method of stabilizing solid organic wastes, such as food waste, and it can produce biogas or other intermediates as energy sources (Tang et al, 2016;Zhou et al, 2017). Volatile fatty acids (VFAs), lactic acid and alcohols are important intermediates in anaerobic food waste fermentation, and could be effectively utilized as carbon sources for nutrient removal (Tang et al, 2017a;Zhang et al, 2016b). Thus, using fermentation products as carbon sources to enhance nutrient removal could be a solution to food waste disposal and wastewater treatment issues.…”

Section: Introductionmentioning

confidence: 99%

“…following the methods presented in the previous studies(Tang et al, 2017a;Zhang et al, 2016b;Sage et al, 2006). First, activated sludge was sampled from the SBRs into four flasks, and washed with tap water three times to remove residual nitrogen compounds and organic matter from the sludge.…”

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confidence: 99%

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Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Tang

Wang

et al. 2018

Bioresource Technology

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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 x-N/(g-VSS•h)) and potential (0.16 g NO 3-N/g COD), and could achieve high NH 4 +-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 2 carbon source for wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Tang

Wang

et al. 2018

Bioresource Technology

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“…The concentration of VFAs increased linearly in the early stage of hydrolysis acidification and decreased gradually in the later stage because microorganisms in anaerobic environments use small VFAs as carbon sources while degrading macromolecular substances. When the contents of protein and other macromolecular substances are gradually reduced, anaerobic microorganisms will gradually utilize methane and small molecular substances (Li et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Research on the enhanced biological nitrogen removal of wastewater by the ultrasound‐hydrolysis acidification of excess sludge

Wang

Liu

Tian

et al. 2020

Water Environment Research

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To simultaneously improve the removal of nitrogen and phosphorus from wastewater with a low C/N ratio and reduce excess sludge production, in this paper, excess sludge ultrasound‐hydrolysis acidification (UHA) pretreatment was coupled with the anaerobic–anoxic–oxic (AAO) process to provide carbon source and enhance biological nitrogen removal performance, and the experimental results can be summarized as follows. First, the total nitrogen (TN) concentrations in the effluent of the system decreased from 16.94 mg/L to 5.74 mg/L, and the removal rate of TN increased by 25.5%. In addition, the concentrations for ammonia nitrogen (NH3‐N) in the system decreased 12.59 mg/L, and the removal rate of this index increased by 29.0%. Furthermore, the specific oxygen uptake rate (SOUR) in the anoxic zone increased significantly because the application of UHA products enhanced the microbial activity, and the addition of UHA products had an effect on the microbial community structure in the system. The amounts of denitrifying bacteria such as Betaproteobacteria and Alphaproteobacteria also increased, which enhanced the nitrogen removal efficiency of wastewater biological treatment. Practitioner points Treatment of excess sludge in UHA device as an additional carbon source. Nitrogen removal efficiency was greatly improved after adding UHA products. Input of UHA products enhanced microbial activity in AAO system. Denitrifying bacteria increased with the addition of UHA products.

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“…On the other hand, the natural fermentation broth of biomass is normally a mixture of VFAs, mainly composed with acetate, propionate, n-butyrate, and so on [20][21][22], therefore, the optimization of the acid/ethanol ratio on a mixed chain elongation fermentation with several VFAs as the electron acceptor is important. The usage of different single acids provides a diversity of MCC products [23], which indicates a significantly varied production and component structure of chain elongation products with different VFAs as the electron acceptor corresponding to different acid/ethanol ratios.…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid/Ethanol Ratio on Medium Chain Carboxylate Production with Different VFAs as the Electron Acceptor: Insight into Carbon Balance and Microbial Community

et al. 2019

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Medium chain carboxylates (MCCs) are important precursors for biodiesel production. Using chain elongation to produce MCCs is an emerging bioenergy technology. In this study, batch tests were conducted to investigate fermentative MCC production through chain elongation from acetate, propionate, n-butyrate, and ethanol. The effect of the acid/ethanol ratio on MCC production by mixed culture was investigated. Better MCC production, especially n-caproate production, was achieved at optimal acid/ethanol ratios of 1:4, 1:3, and 1:2 with acetate, propionate, and n-butyrate as the electron acceptor, respectively. The n-caproate concentration was high, up to 41.54 mmol/L, and the highest n-caproate production efficiency was 57.96% with the n-butyrate/ethanol ratio of 1:2. The higher concentration of ethanol might stimulate the growth of chain elongation bacteria to promote chain elongation. The highest MCC production efficiency with different electron acceptors corresponded to less carbon loss and a higher chain elongation degree. In addition, with the optimal acid/ethanol ratio, the substrate was maximally utilized for chain elongation. The microbial community analysis confirmed the carbon balance analysis with the maximum relative abundance of 52.66–60.55% of the n-caproate producer Clostridium_sensu_stricto_12 enriched by the optimal acid/ethanol ratios with different volatile fatty acids (VFAs) as electron acceptors.

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Enhancing biological denitrification with adding sludge liquor of hydrolytic acidification pretreated by high-pressure homogenization

Cited by 16 publications

References 37 publications

Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Nitrogen removal enhancement using lactic acid fermentation products from food waste as external carbon sources: Performance and microbial communities

Research on the enhanced biological nitrogen removal of wastewater by the ultrasound‐hydrolysis acidification of excess sludge

Effect of Acid/Ethanol Ratio on Medium Chain Carboxylate Production with Different VFAs as the Electron Acceptor: Insight into Carbon Balance and Microbial Community

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