Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions

Pan, Weiyan; Xiong, Yunwu; Huang, Quanzhong

doi:10.3390/w9100786

Cited by 14 publications

(3 citation statements)

References 45 publications

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“…All three processes are microbially mediated and may occur concurrently (Long et al, 2013). Denitrification is favored under suboxic to anoxic conditions and requires abundant electron donors (often organic carbon); these conditions may exist in shallow soils during infiltration for MAR (Wang et al, 2018) and related management strategies aquifer storage and recovery (ASR) and soil aquifer treatment (SAT) (Mienis and Arye, 2018;Pan et al, 2017;Vanderzalm et al, 2013Vanderzalm et al, , 2018. Temperature, pH, saturation, vegetation, and other factors have also been shown to influence denitrification rates (Hiscock et al, 1991;Rao and Malini, 2014;Xiong et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge

et al. 2018

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We present results from field experiments linking hydrology, geochemistry, and microbiology during infiltration at a field site that is used for managed aquifer recharge (MAR). These experiments measured how a horizontal permeable reactive barrier (PRB) made of woodchips impacted subsurface nitrate removal and microbial ecology. Concentrations of dissolved organic carbon consistently increased in infiltrating water below the PRB, but not in un-amended native soil. The average nitrate removal rate in soils below the PRB was 1.5 g/m/day NO-N, despite rapid infiltration (up to 1.9 m/d) and a short fluid residence time within the woodchips (≤6 h). In contrast, 0.09 g/m/day NO-N was removed on average in native soil. Residual nitrate in infiltrating water below the PRB was enriched in δN and δO, with low and variable isotopic enrichment factors that are consistent with denitrification during rapid infiltration. Many putative denitrifying bacteria were significantly enhanced in the soil below a PRB; Methylotenera mobilis and genera Microbacterium, Polaromonas, and Novosphingobium had log fold-changes of +4.9, +5.6, +7.2, and +11.8, respectively. These bacteria were present before infiltration and were not enhanced in native soil. It appears that the woodchip PRB contributed to favorable conditions in the underlying soil for enhanced nitrate removal, quantitatively shifting soil microbial ecology. These results suggest that using a horizontal PRB could improve water quality during rapid infiltration for MAR.

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Section: Introductionmentioning

confidence: 99%

A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge

et al. 2018

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“…COD was primarily removed via microorganism biodegradation [25]. Different sources of pollution can lead to different microbial community compositions, which may result in large differences in the COD degradation coefficient [26].…”

Section: Discussionmentioning

confidence: 99%

Experimental Investigation on the Relationship Between COD Degradation and Hydrodynamic Conditions in Urban Rivers

Tang

Pan

Feng

et al. 2019

IJERPH

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Due to extensive pollution and the relatively weak flow replacement in urban rivers, determining how to fully utilize the self-purification abilities of water bodies for water quality protection has been a complex and popular topic of research and social concern. Organic pollution is an important type of urban river pollution, and COD (chemical oxygen demand) is one of the key pollution factors. Currently, there is a lack of research on the relationship between COD degradation and the flow characteristics of urban rivers. In this paper, COD degradation experiments were conducted in an annular flume with Jinjiang River water at controlled flow velocities and the COD degradation coefficients under different hydraulic conditions were analyzed. A good correlation was observed between the degradation coefficient and hydraulic conditions. According to dimensional analysis, the relationship between the COD degradation coefficient and hydraulic conditions such as the flow velocity, water depth, Reynolds number (Re), and Froude number (Fr) was established as K COD = 86400 u h F r 0.8415 R e − 1.2719 + 0.258 . The COD degradation coefficients of the Chishui River in Guizhou Province ranged from 0.175–0.373 1/d based on this formula, and the field-measured values varied from 0.234–0.463 1/d. The error in the formula ranged from 5.4–25.3%. This study provides a scientific basis for the prediction of the COD degradation coefficients of urban rivers.

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“…Studies have shown that the SAT system mainly relies on the adsorption of medium to intercept nitrogen in wastewater and decrease its concentration to the reference discharge standard. The removal efficiency of the SAT system for nitrogen in sewage is impacted by the hydraulic load, medium type, and other factors, and the average rejection rate is between 50 and 75% [23,24]. If a repair mechanism in the SAT system is enhanced, its removal effect on specific pollutants will be improved [25,26].…”

Section: Introductionmentioning

confidence: 99%

Design of an Enhanced SAT Using Zeolite for the Removal of Ammonia Nitrogen at a Bengbu Aquatic Farm in China

et al. 2022

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As one of the artificial recharge technologies, the soil–aquifer treatment (SAT) system is used for the removal of nitrogen pollution from aquaculture wastewater. An adsorption-enhanced SAT system was designed to reduce the level of nitrogen pollution below the threshold stipulated by the standards. Adsorption kinetics experiments were used to measure the adsorption capacity of zeolite and activated carbon for ammonia nitrogen. Both adsorbents can be well described by the Lagergren pseudo-second-order model, and the adsorption rates of zeolite and activated carbon for ammonia nitrogen were 72.16% and 31.40%, respectively. Combining the experimental data and the actual situation, the medium-packing method was determined and the influence of wastewater characteristics and hydrodynamic conditions on the adsorption and retention capacity of the SAT system were considered. Finally, the feasibility of the adsorption-enhanced SAT site design scheme was verified by Hydrus-1D model simulation. The study found that the design scheme for the situation in the study area was feasible; however, the surrounding underground environment still had a risk of pollution during the operation of the site. Therefore, further research is needed for the nitrogen pollution to be completely removed within the scope of the SAT site.

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Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions

Cited by 14 publications

References 45 publications

A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge

A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge

Experimental Investigation on the Relationship Between COD Degradation and Hydrodynamic Conditions in Urban Rivers

Design of an Enhanced SAT Using Zeolite for the Removal of Ammonia Nitrogen at a Bengbu Aquatic Farm in China

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