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electromigration 2

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microbial fuel cells (MFCs) 1

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Analysis of mobilization of inorganic ions in soil by electrokinetic remediation

Xiaojing LI, Lige WANG, Xueming SUN, Yuansheng CONG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 6, Pages 1463-1473 doi: 10.1007/s11709-019-0569-8

Abstract: Saline soil has imposed a serious threat on many expressway engineering and agricultural areas. This paper describes the performance of saline soil treatment using electrokinetic remediation technology. Comparison study involving sample soil and soil is carried out. Two different electric fields, i.e., uniform and non-uniform are utilized to promote the migration of inorganic ions contained in the soil toward the electrode area. The effects of different electric field types and potential gradient ion migration rate in soil are investigated. The test result reveals that a uniform electric field of a constant potential gradient of 1 V/cm drives the Cl through the sample soil at a rate of 1.36 cm/h. Moreover, larger potential gradients could make ions migrate faster, but more electrical energy is consumed in such a way. Compared with uniform electric field, the non-uniform process maintains the soil pH values more effectively and consumes less electrical energy. A desirable result of removing Na in soil is expected using electrokinetic remediation technology under four-times scaling up of soil volume.

Keywords： electromigration electric fields saline soil soil-remediation

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Nitrogen recovery from wastewater using microbial fuel cells

Yong XIAO,Yue ZHENG,Song WU,Zhao-Hui YANG,Feng ZHAO

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 1, Pages 185-191 doi: 10.1007/s11783-014-0730-5

Abstract: Nitrogen is one of major contaminants in wastewater; however, nitrogen, as bio-elements for crop growth, is the indispensable fertilizer in agriculture. In this study, two-chamber microbial fuel cells (MFCs) were first operated with microorganisms in anode chamber and potassium ferricyanide as catholyte. After being successfully startup, the two-chamber MFCs were re-constructed to three-chamber MFCs which were used to recover the and of synthetic wastewater into value-added nitrogenous fertilizer from cathode chamber and anode chamber, respectively. Ferric nitrate was used as the sole electron acceptor in cathode, which also was used to evaluate the recover efficiency in the case major anion of in cathode. The output voltage of these MFCs was about 600–700 mV at an external load of 500 Ω. About 47% in anode chamber and 83% in cathode chamber could be recovered. Higher current density can selectively improve the recovery efficiency of both and . The study demonstrated a nitrogen recovery process from synthetic wastewater using three-chamber MFCs.

Keywords： nitrogen recovery microbial fuel cells (MFCs) electromigration wastewater treatment