Selection of Agricultural Straws as Sustained-Release Carbon Source for Denitrification in a Drawer-Type Biological Filter

Guan, Xiangxiong; Gui-xia, JI; Xu, Suyun; Yun, Yunbo; Liu, Hongbo

doi:10.1007/s11270-018-4067-8

Cited by 16 publications

(9 citation statements)

References 30 publications

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“…Similar results were found in a study by Ling et al (2021) . On the other hand, the higher TN release of WS led to a lower TN removal efficiency, which has also been observed in the study by Guan et al (2019) . In addition, the different carbon, nitrogen, and phosphorus release of the six agricultural wastes led to different C/N/P ratios in the water.…”

Section: Discussionsupporting

confidence: 80%

Effectiveness of agricultural waste in the enhancement of biological denitrification of aquaculture wastewater

Gao

Gong

Zhang

et al. 2022

PeerJ

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Nitrogen pollution in aquaculture wastewater can pose a significant health and environmental risk if not removed before wastewater is discharged. Biological denitrification uses external carbon sources to remove nitrogen from wastewater; however, these carbon sources are often expensive and require significant energy. In this study, we investigated how six types of agricultural waste can be used as solid carbon sources in biological denitrification. Banana stalk (BS), loofah sponge (LS), sorghum stalk (SS), sweet potato stalk (SPS), watermelon skins (WS) and wheat husk (WH) were studied to determine their capacity to release carbon and improve denitrification efficiency. The results of batch experiments showed that all six agricultural wastes had excellent carbon release capacities, with cumulative chemical oxygen demands of 37.74–535.68 mg/g. During the 168-h reaction, the carbon release process followed the second-order kinetic equation and Ritger-Peppas equation, while carbon release occurred via diffusion. The kinetic equation fitting, scanning electron microscopy, and Fourier transform infrared spectroscopy results showed that LS had the lowest cm and the maximum t1/2 values and only suffered a moderate degree of hydrolysis. It also had the lowest pollutant release rate and cumulative chemical oxygen demand, as well as the most efficient removal of total phosphorous (TP) and total nitrogen (TN). Therefore, we concluded that LS has the lowest potential risk of excess carbon release and capacity for long-lasting and stable carbon release. The WS leachate had the highest TN contents, while the SPS leachate had the highest TP content. In the 181-h denitrification reaction, all six agricultural wastes completely removed nitrate and nitrite; however, SS had the highest denitrification rate, followed by LS, WH, BS, SPS, and WS (2.16, 1.35, 1.35, 1.34, 1.34, and 1.01 mg/(L·h), respectively). The denitrification process followed a zero-order and first-order kinetic equation. These results provide theoretical guidance for effectively selecting agricultural waste as a solid carbon source and improving the denitrification efficiency of aquaculture wastewater treatment.

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Section: Discussionsupporting

confidence: 80%

Effectiveness of agricultural waste in the enhancement of biological denitrification of aquaculture wastewater

Gao

Gong

Zhang

et al. 2022

PeerJ

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“…Regarding the COD concentrations, an increase with increasing organic substrate percentage was observed (Figure 5). Differently from the findings by Guan et al (2019), COD concentrations continued to rise with increasing retention time. Thus, the highest concentrations were observed for the experiments with luffa sponge followed by peanut, walnut and almond shells.…”

Section: Resultscontrasting

confidence: 99%

“…The potential of leaching inorganic nitrogen constituents (nitrate, nitrite and ammonium nitrogen) is given as mg/g in Table 1. These results are generally consistent with other studies (Guan et al, 2019; Wen et al, 2020).…”

Section: Resultssupporting

confidence: 93%

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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“…These metallic elements also enhance denitrification rates by acting as active centers in the denitrification process [21]. The concentrations of Fe, barium (Ba), Zn, Cu, chromium (Cr), and nickel (Ni) in the leachate were found to be low compared to those reported by Yang et al [53] and Guan et al [42] This difference may be attributed to the unique characteristics of corn cob.…”

Section: Leaching Assaymentioning

confidence: 81%

“…Total nitrogen was quantified by summing the concentrations of nitrate, nitrite, and ammonium [18]. Additionally, the organic carbon content of the corn cob was measured in terms of the chemical oxygen demand (COD) to evaluate its organic carbon capacity [42].…”

Section: Determination Of Nitrate Removal Capacity 231 Leaching Testmentioning

confidence: 99%

Enhanced Biological Nitrate Removal from Groundwater in Humid Tropical Regions Using Corn Cob-Based Permeable Reactive Barriers: A Case Study from Panama

Sánchez Hidalgo,

Ortega,

Deago

2024

Water

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Nitrate contamination in groundwater is a global concern due to its widespread presence and consequential social, environmental, and economic ramifications. This study investigates the efficacy of biological denitrification in a humid tropical setting, utilizing corn cob in batch and column tests to assess nitrate removal under varying conditions. Batch tests demonstrated the nitrate removal efficiencies of 93.14%, 91.58%, 90.77%, and 98.74% for initial concentrations of 22.18 ± 2.82 mg/L, 27.3 mg/L, 69.1 ± 1.2 mg/L and 115.08 ± 1.88 mg/L, respectively. In the column test, the removal efficiency was 99.86%, 87.13%, and 74%, and the denitrification rate was 32.82, 53.43, and 83.53 mg NO3−-N/L d, for a hydraulic retention time (HRT) of 24 h, 16 h, and 7 h, respectively. Predominantly, nitrate removal occurred via biological denitrification, particularly favoring a 24 h HRT. The corn cob effectively removed high nitrate concentrations of up to 115 mg NO3−-N/L. Scanning electron microscopy and Fourier transform infrared spectroscopy revealed surface characteristic changes of the carbon source pre- and post-denitrification. This research sheds light on the potential of biological denitrification using corn cob in humid tropical environments, offering a promising avenue for addressing nitrate contamination challenges in groundwater systems.

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Selection of Agricultural Straws as Sustained-Release Carbon Source for Denitrification in a Drawer-Type Biological Filter

Cited by 16 publications

References 30 publications

Effectiveness of agricultural waste in the enhancement of biological denitrification of aquaculture wastewater

Effectiveness of agricultural waste in the enhancement of biological denitrification of aquaculture wastewater

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

Enhanced Biological Nitrate Removal from Groundwater in Humid Tropical Regions Using Corn Cob-Based Permeable Reactive Barriers: A Case Study from Panama

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