Denitrification of nitrate contaminated groundwater with a fiber-based biofilm reactor

Wang, Qinghong; Feng, Chuanping; Zhao, Yingxin; Hao, Chunbo

doi:10.1016/j.biortech.2008.07.057

Cited by 139 publications

(49 citation statements)

References 19 publications

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“…For example, a C/N ratio of 40 was detected on day 8, whereas that on day 24 was 10. In addition, nitrite accumulation was high and lasted for longer periods in lower C/N ratio systems due to inadequate carbon sources for microbial growth (Gómez et al 2000;Wang et al 2009). Previous studies indicated that a higher C/N ratio enhanced DNRA over denitrification (Greenan et al 2006;Van Rijn et al 2006).…”

Section: Effect Of C/n Weight Ratiomentioning

confidence: 99%

Nitrate-Contaminated Water Remediation Supported by Solid Organic Carbon and ZVI-Combined System

Wang

et al. 2015

Water Air Soil Pollut

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Solid organic carbon and zero-valent iron (ZVI) have been used separately as reactive media in permeable reactive barriers (PRBs) to degrade nitrate in groundwater, but few studies have examined the combination of the two materials in one system for nitrate remediation. In the present study, batch tests are conducted to evaluate three common solid organic carbons and their combination with ZVI for nitrate removal from water. The results show that the combined system achieves better denitrification efficiency than that measured with sawdust or cotton alone. However, no obvious difference is noted between the cornstalk alone and its mixture with ZVI treatment. When complete nitrate removal is achieved in the system that combined ZVI with sawdust or cotton, only 72 and 62.6 % of nitrate removal, respectively, are obtained in which the carbon (C) source is used alone. The results indicate that there are synergistic effects in the combined denitrification system, and the effects depend on the type of carbon material used. Sawdust is an alternative carbon source for nitrate removal in a C-ZVI-combined system. In a sawdust-ZVI system, the accumulation of nitrite and ammonium is affected greatly by nitrate concentration, C/N ratio, and Fe/N ratio.

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Section: Effect Of C/n Weight Ratiomentioning

confidence: 99%

Nitrate-Contaminated Water Remediation Supported by Solid Organic Carbon and ZVI-Combined System

Wang

et al. 2015

Water Air Soil Pollut

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“…Some researchers have also conducted experiments combining sulfur-based autotrophic and bioelectrochemical denitrification system (Wang et al 2009;Wan et al 2009). This process eliminates the usage of limestone as the hydrogen ion generated during sulfur denitrification which could be utilized in biochemical hydrogen denitrification to acquire neutralization ).…”

Section: Sulfur Reductionmentioning

confidence: 99%

Remediation of nitrate-contaminated water by solid-phase denitrification process—a review

Ashok

Hait

2015

Environ Sci Pollut Res

124

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The paper presents a compilation of various autotrophic and heterotrophic ways of solid-phase denitrification. It covers a complete understanding of various pathways followed during denitrification process. The paper gives a brief review on various governing factors on which the process depends. It focuses mainly on the solid-phase denitrification process, its applicability, efficiency, and disadvantages associated. It presents a critical review on various methodologies associated with denitrification process reported in past years. A comparative study has also been carried out to have a better understanding of advantages and disadvantages of a particular method. We summarize the various organic and inorganic substances and various techniques that have been used for enhancing denitrification process and suggest possible gaps in the research areas whi'ch are worthy of future research.

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“…Đây là giá trị pH thường gặp đối với các nguồn nước ngầm ở các tỉnh đồng bằng miền Bắc nước ta, quá trình khử nitrate vẫn xảy ra bình thường mà không ảnh hưởng đến pH môi trường (Hình 1). Nghiên cứu của Wang et al, (2009) khi nghiên cứu quá trình khử nitrate trong nước ngầm bị nhiễm nitrate thì quá trình này tối ưu ở pH 7-7,5.…”

Section: ảNh Hưởng Của Oxyunclassified

“…Nguyên nhân chính là do ô nhiễm amoni từ nhiều nguồn nước thải, sử dụng phân hóa học không đúng cách, bên cạnh đó còn dùng nước thải sinh hoạt để tưới tiêu và sự thay đổi mô hình trồng trọt. Các hợp chất nitơ được chuyển đổi trong đất thông qua hoạt động của vi sinh vật, kết quả là nitrate được hình thành, chúng là các ion dễ biến đổi và dễ thẩm thấu qua các tầng đất để vào tầng nước ngầm.Ngày nay, nhiều nước trên thế giới sử dụng nguồn nước ngầm như một nguồn nước cho ăn uống đặc biệt ở các vùng khô hạn như Saudi Arabia, riêng Trung Quốc có tới 50% các thành phố sử dụng nguồn nước ngầm làm nước ăn uống (Wang et al, 2009). Khi con người ăn phải nguồn nước bị nhiễm nitrate sẽ dẫn đến hiện tượng rối loạn máu do máu không đủ oxy nuôi cơ thể (methaemoglobinaemia), sinh ra hội chứng xanh da ở trẻ em dưới 6 tháng tuổi.…”

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Investigation of suitable conditions for the growth and producing biofilm of denitrifying bacteria

Ha¹,

Huy²,

Yen³

2016

Vietnam J. Biotechnol.

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Denitrification occurs under anaerobic conditions, utilizing organic substances such as a carbon source and nitrate as the terminal electron acceptor. Some bacteria strains that are capable of producing biofilm and are attached to the carrier for the applications of the nitrate contaminated water treatment. This process is done simultaneously with the process of nitrification, nitrifying bacteria on the biofilm surface (ocic zone), denitrifying bacteria under biofilm (anoxic zone). The selection of suitable conditions for the growth and production of biofilm of denitrifying bacteria is the target of this research. Two strains D10 and D32 are capable to reduce nitrate and created the best biofilm. Optimal conditions for the strain growth were: 37oC, pH 6.6 - 7. Supplementation of 0.006% M1, E2 (methanol, ethanol) increased the reducing N-NO3 to 80% and 100% respectively. Denitrification process still occured in aerobic condition but with lower efficiency (25.8%) byD32 strain. Based on 16S rRNA gene analysis, D10 strain was the closest relative with Bacillus fusiformis, D32 closest to Pseudomonas denitrifricans.

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Denitrification of nitrate contaminated groundwater with a fiber-based biofilm reactor

Cited by 139 publications

References 19 publications

Nitrate-Contaminated Water Remediation Supported by Solid Organic Carbon and ZVI-Combined System

Nitrate-Contaminated Water Remediation Supported by Solid Organic Carbon and ZVI-Combined System

Remediation of nitrate-contaminated water by solid-phase denitrification process—a review

Investigation of suitable conditions for the growth and producing biofilm of denitrifying bacteria

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