Performance of Corncob-based Solid Phase Denitrification System: A Column Study

Zhong Hua, Cheng Ying, Zhang Hongwei, Shao Yalu, Zeng Guangming

Abstract

Corncob，a typical agricultural waste，is studied as the carbon source for solid phase denitrification under dynamic flow conditions by using 1-D column experiment. The results show that the hydraulic retention time has significant effect on the denitrification rate and transformation between the nitrogen species. The increase of hydraulic retention time can improve the denitrification rate，however，it can cause the accumulation of nitrite when it is in a proper range or ammonium if it is too large. C/N ratio is also an important factor affecting the solid phase denitrification. Appropriate C/N ratio can improve the nitrate removal rate and inhibit the production of nitrite and ammonium. The results show that the optimal hydraulic retention time of the system is 16 h，and the proper nitrate concentration for the system to treat is 50 mg· L-1. Corncob has good application potential as the packing material of permeable reactive barrier for solid phase denitrification，as it can steadily release the water-soluble TOC to provide electron donor and its surface structure also favors microbial adhesion and growth. The result indicates that Pseudomonas sp is the main bacteria in the corncob-based denitrification system.

 

 

Keywords:  nitrate,  nitrite,  ammonia,  hydraulic residence time,  carbon-to-nitrogen ratio,  solid phase denitrification


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ZHAI Y，ZHAO X，TENG Y，et al. Groundwater nitrate pollution and human health risk assessment by using HHRA model in an agricultural area，NE China [J]. Ecotoxicology & Environmental Safety，2017，137：130—142.

CAO W. Nitrogenous compounds removal from recalcitrant wastewaters using biofilms on filamentous bamboo [J]. Desalination & Water Treatment，2016，57（30）：13995—14003.

KONDAVEETI S，LEE S H，PARK H D，et al. Bacterial communities in a bioelectrochemical denitrification system：the effects of supplemental electron acceptors [J]. Water Research，2014，51 （12）：25.

ZHOU H Y，LIANG S，ZENG S S，et al. Chemical reduction of nitrate in aqueous solution by iron powder [J]. Advanced Materials Research，2013，777：71—76.

RAJIC L，BERROA D，GREGOR S，et al. Electrochemically -induced reduction of nitrate in aqueous solution [J]. International Journal of Electrochemical Science，2017，12（7）：5998—6009.

FOX S，BRUNER T，OREN Y，et al. Concurrent microbial reduction of high concentrations of nitrate and perchlorate in an ion exchange membrane bioreactor[J]. Biotechnology & Bioengineering， 2016，113（9）：1881—1891.

WANG J L，CHU L B. Biological nitrate removal from water and wastewater by solid-phase denitrification process[J]. Biotechnology Advances，2016，34（6）：1103—1112.

LIU H，JIANG W，WAN D，et al. Study of a combined heterotrophic and sulfur autotrophic denitrification technology for removal of nitrate in water [J]. Journal of Hazardous Materials，2009，169（1）： 23—28.

J准RGENSEN P R，URUP J，HELSTRUP T，et al. Transport and reduction of nitrate in clayey till underneath forest and arable land [J]. Journal of Contaminant Hydrology，2004，73（1）：207—226.

PUIG R，SOLER A，WIDORY D，et al. Characterizing sources and natural attenuation of nitrate contamination in the Baix Ter aquifer system（NE Spain）using a multi-isotope approach[J]. Science of the Total Environment，2016，580：518—532.

RIVETT M O，BUSS S R，MORGAN P，et al. Nitrate attenuation in groundwater：a review of biogeochemical controlling processes[J]. Water Research，2008，42（16）：4215—4232.

LI T，LI W，FENG C，et al. In-situ biological denitrification using pretreated maize stalks as carbon source for nitrate -contaminated groundwater remediation[J]. Water Science and Technology：Wa原 ter Supply，2017，17（1）：1—9.

RUANY J，DENGY L，GUOX S，et al. Simultaneous ammonia and nitrate removal in an airlift reactor using poly（butylene succinate） as carbon source and biofilm carrier [J]. Bioresource Technology， 2016，216：1004—1013.

SHEN Z Q，ZHOU Y X，HU J，et al. Denitrification performance and microbial diversity in a packed -bed bioreactor using biodegradable polymer as carbon source and biofilm support[J]. Journal of Hazardous Materials，2013，250—251（8）：431—438. [15] GREENAN C M，MOORMAN T B，KASPAR T C，et al. Comparing carbon substrates for denitrification of subsurface drainage water [J]. Journal of Environmental Quality，2006，35（3）：824—829.


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