Selection and synthesization of multi–carbon source composites to enhance simultaneous nitrification–denitrification in treating low C/N wastewater

Zou, Liangchao; Zhou, Mi; Luo, Zhongwu; Zhang, Houlin; Yang, Zhi; Cheng, Hong; Li, Runjia; He, Qiang; Ai, Hainan

doi:10.1016/j.chemosphere.2021.132567

Cited by 19 publications

(6 citation statements)

References 68 publications

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“…The release rates of the three biofilm carriers were close to 0 mg•(g•d) −1 after 20 d. In addition, the cumulative TN released by the three biofilm carriers was 0.064, 0.046, and 0.036 mg•g −1 for the MC, MCB, and MCA biofilm carriers, respectively. These values were similar to those reported by Zou et al [40]. Proteins in cellulose can be dissolved in water, resulting in an increased nitrogen content in soaking solutions [43].…”

Section: Static Release Performance Of Biofilm Carriersupporting

confidence: 90%

“…The MCA biofilm carrier showed a better carbon release effect. The rapid and fast release phases are due to the rapid dissolution of water-soluble organic matter on the surface of the corncob; the slow release phase is due to the slow hydrolysis of insoluble cellulose and hemicellulose into soluble organic matter by microorganisms when the small molecules inside the corncob are depleted and the carbon source is slowly released [40]. As a biofilm carrier skeleton, PVA equalizes the rate of the entire release process, prevents excessive carbon release in the initial stage, and guarantees sufficient carbon release in later stages [22].…”

Section: Static Release Performance Of Biofilm Carriermentioning

confidence: 99%

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Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Wang,

Liu,

et al. 2023

Fermentation

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Wastewater with a low carbon/nitrogen (C/N) ratio is widespread and difficult to treat. The addition of an external carbon source is an effective method for treating such wastewater. Therefore, we aimed to prepare a self-releasing carbon biofilm carrier using agricultural waste (corncobs), polyvinyl alcohol, and sponge iron in various ratios to provide a carbon source that would facilitate denitrification, providing an optimal environment for microorganisms. We found that the carbon release of the MAC biofilm carrier that accumulated over 60 d was 116.139 mg of chemical oxygen demand (COD)·g−1, whereas the accumulated total nitrogen release was approximately 0 mg·(g·d)−1. The NO3−-N removal rate after 24 h reached 98.1%, whereas the theoretical use rate of the carbon source (in terms of COD) was stable at 90.34%. In addition, the sum of the abundances of the denitrifying and cellulose-degrading bacteria was 49.89%. Furthermore, biofilm carriers are used as functional carriers that contribute to cellulose degradation, a process in which sponge iron produces Fe2+ to provide electron donors and shuttles for denitrifying bacteria and forms the iron cycle, thereby inducing an increase in microbial abundance; this increase then facilitates the microbial degradation of cellulose and synergistic denitrification through interspecific bacterial cooperation. This study provides a new and effective method for enhancing the denitrification of wastewater with low C/N ratios.

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Section: Static Release Performance Of Biofilm Carriersupporting

confidence: 90%

Section: Static Release Performance Of Biofilm Carriermentioning

confidence: 99%

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Wang,

Liu,

et al. 2023

Fermentation

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“…Currently, methanol, sodium acetate, and glucose are the commonly used carbon sources in most sewage-treatment plants [4][5][6]; however, all of these carbon sources have some disadvantages. Methanol exhibits high toxicity, and microorganisms take more time to adapt to it.…”

Section: Introductionmentioning

confidence: 99%

Denitrification Performance and Microbiological Mechanisms Using Polyglycolic Acid as a Carbon Source

Wang,

Li,

Yang

et al. 2024

Water

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When treating municipal wastewater, nitrogen removal is often limited due to low C/N, which needs to be compensated for by additional carbon source injections. This study investigated the feasibility of using industrial-waste polyglycolic acid (PGA) as a carbon source for denitrification in an SBR to obtain an economical carbon source. The results revealed that an optimal denitrification performance in a methanol-fed activated sludge system was achieved with a PGA dosage of 1.2 mL/L, a pH of 7–8, and a dissolved-oxygen (DO) concentration of 3 ± 0.5 mg/L. Under these conditions, all quality parameters for effluent water met the required criteria [COD < 50 mg/L; TN < 15 mg/L; NH4+-N < 5(8) mg/L]. PGA enhanced the variety and richness of microbial communities, thereby markedly increasing the relative abundance of major phyla such as Proteobacteria and Bacteroidota and major genera such as Paracoccus and Dechloromonas. Furthermore, PGA upregulated the expression of nitrogen-metabolism-related genera, including amo, hao, nar, and nor, which improved the denitrification performance of the system. This study provides a reference for applying PGA as a carbon source for low-C/N-wastewater treatment and solid-waste utilization.

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“…The denitrification is the main obstacle. Denitrification requires a carbon source as an electron donor; however, the municipal wastewater generally contains low organic matters (low COD concentration) in China [2,3]. It suggests that COD is consumed during aerobic step and there is no (or less) extra carbon source left for denitrification.…”

Section: Introductionmentioning

confidence: 99%

“…It suggests that slow carbon releasing materials are highly required. Solid carbon sources, including polyvinyl alcohol (PVA), carrageenan (CG), polylactic acid (PLA), polycaprolactone (PCL), and some their composites have been used as slow-release carbon sources in mixotrophic denitrification, and the solid carbon source utilization showed enhanced denitrification performance [3,[13][14][15][16][17]. The carbon can slowly release from the solid carbon source during degradation by microorganisms, and thus eliminates the risk of COD concentration exceeding the discharging limit.…”

Section: Introductionmentioning

confidence: 99%

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

Hong¹,

Tang

Feng

et al. 2022

Separations

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Mixotrophic denitrification has showed great potential for treating wastewater with a low C/N ratio. Mixotrophic denitrification is the process combining autotrophic denitrification and heterotrophic denitrification in one system. It can compensate the disadvantage of the both denitrifications. Instead of using sodium acetate and glucose as carbon source for the heterotrophic denitrification, agriculture solid wastes including rice straw (RS), wheat straw (WS), and corncob (CC) were employed in this study to investigate their potential as carbon source for treating low C/N wastewater. The carbon releasing pattern of the three carbon rich materials has been studied as well as their capacity in denitrification. The results showed that the highest denitrification occurred in the corncob system which was 0.34 kg N/(m3·d). Corncob was then selected to combine with sulfur beads to build the mixotrophic denitrification system. The reactor packed with sulfur bead on the top and corncob on the bottom achieved 0.34 kg N/(m3·d) denitrification efficiency, which is higher than that of the reactor packed with completely mixed sulfur bead and corncob. The autotrophic denitrification and heterotrophic denitrification were 42.2% and 57.8%, respectively. The microorganisms in the sulfur layer were Thermomonas, Ferritrophicum, Thiobacillus belonging to autotrophic denitrification bacteria. Kouleothrix and Geothrix were mostly found in the corncob layer, which have the function for fiber hydrolysis and denitrification. The study has provided an insight into agriculture solid waste application and enhancement on denitrification of wastewater treatment.

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Selection and synthesization of multi–carbon source composites to enhance simultaneous nitrification–denitrification in treating low C/N wastewater

Cited by 19 publications

References 68 publications

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Denitrification Performance and Microbiological Mechanisms Using Polyglycolic Acid as a Carbon Source

Agriculture Waste as Slow Carbon Releasing Source of Mixotrophic Denitrification Process for Treating Low C/N Wastewater

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