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

Ling, Yu; Yan, Guokai; Wang, Haiyan; Dong, Weiyang; Wang, Huan; Chang, Yang; Chang, Ming; Li, Congyu

doi:10.3390/ijerph18031232

Cited by 26 publications

(21 citation statements)

References 35 publications

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“…As the reaction proceeds, the cellulose, which is difficult to degrade in agricultural waste, begins to decompose, leading to slow carbon release until equilibrium. Ling et al [ 11 ] studied the carbon release performance of six different agricultural wastes. Their results show that the six agricultural wastes’ carbon release process can be divided into the rapid and slow-release stages, which are consistent with the results of this study.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with high-quality carbon source, agricultural waste can not only be used as an additional carbon source but also provide a carrier for the growth of, and a stable living environment for, microorganisms [ 9 , 10 ]. Ling et al [ 11 ] studied the carbon release and nitrogen removal performance of six kinds of agricultural wastes, namely, rice straw, wheat straw, corn straw, corncob, soybean stalk, and soybean hull, as carbon sources. They found that corncob has a strong carbon release and denitrification performance and does not easily lead to secondary pollution risk.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Denitrification of Integrated Sewage Treatment System by Supplementing Denitrifying Carbon Source

Chen

Zheng

et al. 2021

IJERPH

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Integrated sewage treatment system (ISTY) is a new technology for rural domestic sewage treatment. In the ISTY, the carbon source in the denitrification stage is often insufficient, affecting the denitrification efficiency. In order to improve the denitrification efficiency, several commonly available agricultural wastes, peanut shell (PS), sawdust (SD), peat (PT), and their mixtures (MT), were selected as supplementary carbon sources in the denitrification stage of ISTY to study the denitrification efficiency. Results show that PS exhibited a high carbon release capacity. PS released an enormous amount of carbon in 144 h, and the cumulative total organic carbon was 41.99 ± 0.7 mg/(g·L). The optimum carbon source dosage was 3 g/L, the nitrate removal rates of PS exceeded 95% after 48 h, and the denitrification rates were 9.35 mg/(g·L), which were 63.92% higher than that of the control group. After running the ISTY for 120 h, and with PS as supplementary carbon sources, the removal rate of TN increased from 29.76% to 83.86%. At the genus level, the dominant denitrifying bacteria in ISTY, after adding PS, were Pseudomonas and Cupriavidus, accounting for 78.68%, an increase of 72.90% compared with the control group. This evidence suggested that PS can obviously enhance the denitrification efficiency of the ISTY as a supplementary carbon source.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Denitrification of Integrated Sewage Treatment System by Supplementing Denitrifying Carbon Source

Chen

Zheng

et al. 2021

IJERPH

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“…Feng et al (2017) stated that dissolution of organic carbon was happening from two sources: the direct solubilization from the substrate at the beginning and as a result from gradual hydrolyses by bacteria. Ling et al (2021) explained that after initial solubilization of smaller molecular size organic constituents, less soluble cellulose and hemicellulose constituents hydrolyses slowly to soluble OMs. After 45 days, COD concentrations reached values of 209, 262, 526 and 455 mg O 2 /L for 20%, 40%, 60% and 100% luffa sponge, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, higher substrate percentages were negatively influencing the removal rates, and lower percentages were delivering the necessary organic carbon concentration for total removal of nitrogen compounds, except for almond shell (Table 2). Low or insufficient carbon release may cause to slow biofilm growth, low nitrogen removal efficiencies and longer start –up times (Ling et al, 2021), which may be the reason of the lower TIN removal efficiency observed for 40% almond shell.…”

Section: Discussionmentioning

confidence: 99%

Screening of organic substrates for a permeable biobarrier to remediate nitrate contaminated groundwater

Özkaraova

AYDIN

Gemechu

2021

Water & Environment J

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Easily available organic substrates (e.g., peanut, walnut and almond shells and luffa sponge) were evaluated as potential filter material for permeable biobarrier systems. Higher removal efficiencies and rate constants were observed for lower (20%) substrate (e.g., peanut, walnut and luffa sponge) percentages indicating to the importance of substrate percentage. Rate constants were higher for total inorganic nitrogen removal (≥0.137 mg N/L/d) than for nitrate removal (≥0.127 mg N/L/d) in the batch bioreactors promising the capability of microorganisms in consuming substrate released nitrogen compounds. Continuous flow biobarriers revealed greater removal efficiencies (<1 mg NO3−–N/L) and rate constants (≥2.38 mg NO3−–N/L/d) that were related to better microbial performance with increased substrate contact. Different dissolved oxygen levels observed for peanut shell (≤7.45 mg O2/L) and luffa sponge columns (<3 mg O2/L) were indicating to the existence of different mechanisms and microorganisms during simultaneous heterotrophic nitrification and aerobic or anoxic denitrification. Luffa sponge was found to be the best candidate as a biobarrier substrate for a longer timescale, although walnut and almond shells may be excellent materials both supporting the denitrification process and permeability of barrier system.

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“…Unlike the soluble carbon substrates, they yield satisfactory denitrification rates only at low to moderate flow rates. In practice, significant fluctuation of the effluent quality might be caused by the addition and replacement of agricultural wastes (Ling et al 2021). Moreover, a substrate that is effective for wastewater denitrification may not be as effective for groundwater remediation.…”

Section: Introductionmentioning

confidence: 99%

Study on the properties of denitrifying carbon sources from cellulose plants and their nitrogen removal mechanisms

Liang

Liu

et al. 2021

Water Science and Technology

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Carbon sources of cellulose plants are the promising materials that enhancing the activities of denitrifying bacteria in the groundwater system. To further verify the denitrification performance of cellulose plants and the main factors of affecting the denitrifying system, six cellulose plants from agricultural wastes (wood chip, corn cob, rice husk, corn straw, wheat straw, and sugar cane) were selected for bioavailable organic matter leaching experiments, carbon denitrification experiments, functional bacteria identification, and analysis experiments. The results show that the extracts of cellulose plants contain a mixed carbon sources system including small molecular organic acids, sugars, nitrogen-containing organic components, and esters. The qPCR results showed that the denitrifying bacteria had obvious advantages compare to anaerobic ammonia-oxidizing bacteria during the stable period; the denitrification experiment showed that each of six cellulose plants removed more than 80% of nitrogen, and the denitrification rates reached 1.00–2.00 mg N cm−3·d−1. The supplement of cellulose plants promotes the metabolism rate of denitrifying bacteria, and the additional denitrifying bacteria have little effect on nitrate removal. In summary, the expected denitrification reaction occurred in the cellulose plant system, which is suitable as a carbon source material for water body nitrogen pollution remediation.

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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

Cited by 26 publications

References 35 publications

Enhanced Denitrification of Integrated Sewage Treatment System by Supplementing Denitrifying Carbon Source

Enhanced Denitrification of Integrated Sewage Treatment System by Supplementing Denitrifying Carbon Source

Screening of organic substrates for a permeable biobarrier to remediate nitrate contaminated groundwater

Study on the properties of denitrifying carbon sources from cellulose plants and their nitrogen removal mechanisms

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