Efficient nitrate removal by Ca-treated activated carbon derived from agricultural residues

In this paper, a study on using fixed-film biological denitrification to remove nitrates from water supplies is reported. Fixed-film biological systems have not been used in water supply systems in the U.S. although they are proven to be efficient and economical for removing nitrates with the reason being the possibility of imparting residual organics, suspended solids and bacteria to the treated water. In this research, fixed-film upflow biodenitrification columns were operated under carbon-starved conditions and the effluent was treated with a granular activated carbon (GAC) and sand filter system (combined in one unit) to remove residual organics and suspended matter. The system resulted in an average effluent turbidity of 0.8 NTU, and COD and total suspended solids (TSS) concentrations of 5.7 and 0.6 mg/L, respectively.

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Effects of alkali-treated agricultural residues on nitrate removal and N2O reduction of denitrification in unsaturated soil

Journal of Environmental Management ◽

10.1016/j.jenvman.2018.02.078 ◽

2018 ◽

Vol 214 ◽

pp. 276-282 ◽

Cited By ~ 4

Author(s):

Zhaoyue Sun ◽

Tianyuan Zheng ◽

Jia Xin ◽

Xilai Zheng ◽

Rongting Hu ◽

...

Keyword(s):

Unsaturated Soil ◽

Nitrate Removal ◽

Agricultural Residues ◽

N2o Reduction

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Enhanced nitrate removal by micro-electrolysis using Fe0 and surfactant modified activated carbon

Chemical Engineering Journal ◽

10.1016/j.cej.2018.09.071 ◽

2019 ◽

Vol 357 ◽

pp. 180-187 ◽

Cited By ~ 22

Author(s):

Lianggen Ao ◽

Fan Xia ◽

Yang Ren ◽

Jian Xu ◽

Dezhi Shi ◽

...

Keyword(s):

Activated Carbon ◽

Nitrate Removal ◽

Modified Activated Carbon

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Nitrate removal from tile drainage water: The performance of denitrifying woodchip bioreactors amended with activated carbon and flaxseed cake

Agricultural Water Management ◽

10.1016/j.agwat.2019.105937 ◽

2020 ◽

Vol 229 ◽

pp. 105937 ◽

Cited By ~ 1

Author(s):

Arvydas Povilaitis ◽

Jolanta Matikienė

Keyword(s):

Activated Carbon ◽

Nitrate Removal ◽

Drainage Water ◽

Tile Drainage

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Electro-sorption of ammonium ion onto nickel foam supported highly microporous activated carbon prepared from agricultural residues (dried Luffa cylindrica)

The Science of The Total Environment ◽

10.1016/j.scitotenv.2019.04.066 ◽

2019 ◽

Vol 673 ◽

pp. 296-305 ◽

Cited By ~ 6

Author(s):

Yu-Jen Shih ◽

Cheng-Di Dong ◽

Yao-Hui Huang ◽

C.P. Huang

Keyword(s):

Activated Carbon ◽

Nickel Foam ◽

Agricultural Residues ◽

Ammonium Ion ◽

Luffa Cylindrica

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Experimental effect of medium ratio on removal efficiency of nitrate nitrogen in groundwater by zero-valent iron, activated carbon and zeolite

Water Science & Technology Water Supply ◽

10.2166/ws.2019.036 ◽

2019 ◽

Vol 19 (6) ◽

pp. 1636-1642

Author(s):

Sizhi Cao ◽

Peigui Liu ◽

Mingchao Liu ◽

Gang Wang ◽

Zaili Li ◽

...

Keyword(s):

Activated Carbon ◽

Nitrate Nitrogen ◽

Nitrogen Concentration ◽

Nitrate Removal ◽

Ammonia Nitrogen ◽

Coarse Sand ◽

Zero Valent Iron ◽

Nitrite Nitrogen ◽

Rich Solution ◽

Set Up

Abstract In this study, column experiments in the laboratory were set up to examine how the concentrations of nitrate nitrogen, nitrite nitrogen, and ammonia nitrogen changed when a nitrate-rich solution was passed through a medium comprising zero-valent iron, activated carbon, zeolite, and coarse sand. We varied the proportions of the components of the medium to determine how it influenced the nitrate removal and nitrogen fractions. Three different scenarios were used, with: (1) iron, activated carbon, and coarse sand at a ratio of 3:1:6; (2) iron, activated carbon, and zeolite at a ratio of 3:1:6; and (3) iron, activated carbon, and zeolite at a ratio of 3:3:4. The nitrate nitrogen concentration decreased from 25 mg/L to 2 mg/L in the first scenario. Removal was better when zeolite was added to the medium as most of the nitrate nitrogen broke down to ammonia nitrogen, with nitrite nitrogen as an intermediate product. The results of the tests showed that nitrate removal was best when the medium was iron, activated carbon, and zeolite, mixed at a ratio of 3:1:6. This study provides a scientific reference for in situ remediation of nitrate pollution in groundwater.

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