Alkali-treated cellulose carrier enhancing denitrification in membrane bioreactor

Li, Tao; Yang, Xiao; Song, Hai Liang; Wu, Jia-Jun; Xu, Jia Ying

doi:10.1016/j.ibiod.2019.104813

Cited by 21 publications

(4 citation statements)

References 46 publications

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“…By contrast, CC had the lowest potential risk of secondary pollution. The main constituents of agricultural wastes are biodegradable cellulose, hemicellulose, and refractory lignin [18]. The extracellular enzymes excreted by the microorganisms can hydrolyze cellulose and hemicellulose into soluble and small molecule substrates, which can be utilized by microbes during the denitrification process [25].…”

Section: Resultsmentioning

confidence: 99%

“…The biodegradable cellulose and hemicellulose substances of the natural lignocellulosic materials can be hydrolyzed into soluble and small molecular organic matter by the extracellular enzymes excreted by the microbes attached on the biofilm, and then supplied as electron donors for the denitrification process [15,16]. At present, most research on lignocellulosic materials as carbon sources are focused on the selection of high-efficiency materials, pretreatment methods to enhance nitrate removal capacity, and microbial community succession in the nitrogen removal process [17][18][19][20]. Agricultural wastes, which are mainly composed of lignocellulosic materials, are also widely studied because of their cheapness and easy availability [16].…”

Section: Introductionmentioning

confidence: 99%

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Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Ling

Yan

Wang

et al. 2021

IJERPH

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Agricultural wastes used as denitrification carbon sources have some drawbacks such as excessive organic carbon release and unclear release characteristics of nitrogen, phosphorus, and chromatic substances, which can cause adverse effects on the effluent quality during the denitrification process. The composition and surface characteristics, carbon release mechanisms, and secondary pollutant release properties of six kinds of agricultural wastes, i.e., rice straw (RS), wheat straw (WS), corn stalk (CS), corncob (CC), soybean stalk (SS), and soybean hull (SH) were studied and analyzed in this research. The denitrification performance of these agricultural wastes was also investigated extensively by batch experiments. The results showed that the carbon release basically followed the second-order reaction kinetic equation and Ritger–Peppas equation in the 120 h reaction, and it was mainly controlled by the diffusion process. The kinetic equation fitting results and bioavailability test suggested that the potential risk of excessive effluent COD of CC was the lowest due to the appropriate amount and degradability of its released carbon. The NH4+-N, TN, and TP in the leachate of RS were higher than those of the other five agriculture wastes, and the chroma in the leachate of WS and CS was heavier than that of the others. CC released the lowest pollutants, which resulted in slight fluctuations of effluent quality in the start-up period (1–11 d), and it had the best nitrogen removal capacity in the denitrification experiment. The average NO3−-N removal of CC was 5.12 mg for each batch in the stable period (11–27 d), which was higher than that of others, and less NO2−-N, NH4+-N, and COD were accumulated in the CC effluent during the whole denitrification process.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Ling

Yan

Wang

et al. 2021

IJERPH

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“…The carbon content of WH was 49.10% ( Table S2 ), which was much higher than the nitrogen and phosphorus content, indicating that WH is less likely to cause secondary pollution. The main components of agricultural waste include biodegradable cellulose, hemicellulose, and lignin ( Li et al, 2019b ). The extracellular enzymes secreted by attached denitrifying microbial biofilms can degrade cellulose and hemicellulose into soluble small molecule substrates, which can be further utilized by denitrifying bacteria as carbon source in the denitrification process ( Sun et al, 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Effects of hydraulic retention time and influent nitrate concentration on solid-phase denitrification system using wheat husk as carbon source

Niu

Gao

Zhang

et al. 2023

PeerJ

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Solid-phase denitrification shows promise for removing nitrate (NO3−-N) from water. Biological denitrification uses external carbon sources to remove nitrogen from wastewater, among which agriculture waste is considered the most promising source due to its economic and efficiency advantages. Hydraulic retention time (HRT) and influent nitrate concentration (INC) are the main factors influencing biological denitrification. This study explored the effects of HRT and INC on solid-phase denitrification using wheat husk (WH) as a carbon source. A solid-phase denitrification system with WH carbon source was constructed to explore denitrification performance with differing HRT and INC. The optimal HRT and INC of the wheat husk-denitrification reactor (WH-DR) were 32 h and 50 mg/L, respectively. Under these conditions, NO3−-N and total nitrogen removal rates were 97.37 ± 2.68% and 94.08 ± 4.01%, respectively. High-throughput sequencing revealed that the dominant phyla in the WH-DR operation were Proteobacteria, Bacteroidetes, and Campilobacterota. Among the dominant genera, Diaphorobacter (0.85%), Ideonella (0.38%), Thiobacillus (4.22%), and Sulfurifustis (0.60%) have denitrification functions; Spirochaeta (0.47%) is mainly involved in the degradation of WH; and Acidovorax (0.37%) and Azospira (0.86%) can both denitrify and degrade WH. This study determined the optimal HRT and INC for WH-DR and provides a reference for the development and application of WH as a novel, slow-release carbon source in treating aquaculture wastewater.

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“…Many researches found the hydrothermal treatment can destroy the structure of lignocellulosic biomass and dissolve the hemicelluloses contents, thus exposing the cellulose surface and increasing enzyme accessibility to the cellulose micro brils (Jeong et al, 2020). Alkali treatment were found to cause swelling, resulting in a decrease in the degree of polymerization (Li et al, 2021) and an increase in internal surface area, which is bene cial to the continuous carbon release of PBs. While Selig et al (2007) found droplets composing of lignins and possible lignin-carbohydrate complexes were formed on the surface of residual corn stover following acid pretreatment, and these droplets were shown to have a negative effect on the enzymatic sacchari cation of the substrate, which can account for the low COD release of acid treatment.…”

Section: Comparison Of Pretreatment Conditionsmentioning

confidence: 99%

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

Tuo

Cao

et al. 2021

Preprint

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The problem of poor carbon source is a common factor limiting the nutrients removal in bioretention cells (BRCs). This study aimed to investigate the feasibility of using modified biomass in BRCs filled with a mixture of fly ash ceramsite and pumice fillers to enhance nitrogen removal. Different pretreatment methods (hydrothermal-treated, acid-treated and alkali-treated) were attempted, and hydrothermal pretreatment showed a best performance in carbon release ability. The scanning electron microscopy showed that the lignin in hydrothermal pretreated pine barks (H-PBs) was destroyed, and the fiber structure became thinner with more irregular folds, which improved the accessibility of cellulose and attachment of microorganisms. The addition of H-PBs significantly enhanced the nutrients removal in BRCs, and the removal rates of TN and NO3−-N increased by 23.25% and 38.22% compared with those in BRC-A (without external carbon source), but the removal rate of NH4+-N was inferior to BRC-A. Besides, the large carbon release amount of H-PBs did not deteriorate the effluent quality, with COD removal rate of 87.98% in the 48 d. These results indicate that the BRCs by adding H-PBs could intensify the denitrification process.

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Alkali-treated cellulose carrier enhancing denitrification in membrane bioreactor

Cited by 21 publications

References 46 publications

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Effects of hydraulic retention time and influent nitrate concentration on solid-phase denitrification system using wheat husk as carbon source

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

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