By Fei Liu, Guoxin Huang, Howard Fallowfield, Huade Guan, Lingling Zhu, Hongyan Hu
"Study on Heterotrophic-Autotrophic Denitrification Permeable Reactive boundaries (HAD PRBs) for In Situ Groundwater Remediation” is an unrivaled reference paintings on PRBs for groundwater in situ remediation. It proposes a singular HAD PRB technique for nitrate-contaminated groundwater remediation, and gives a scientific and transparent rationalization of layout options and denitrification mechanisms. The publication includes 4 chapters, every one of which covers key facets of HAD PRBs. It presents wealthy, easy-to-follow illustrations, tables and references. detailed as a accomplished reference paintings at the topic, it's going to function a invaluable source for all engineers and scientists lively in environmental technology and engineering, groundwater technological know-how, engineering and molecular biology. Prof. Fei Liu works at China collage of Geosciences (Beijing), China. Dr. Guoxin Huang works at Beijing Academy of meals Sciences, China. either Prof. Howard Fallowfield and Prof. Huade Guan paintings at Flinders collage, Australia. Assistant Engineer Lingling Zhu works at Geological Publishing residence, China. Assistant Engineer Hongyan Hu works at Hydrogeology and Engineering Geology Prospecting Institute of Heilongjiang Province, China.
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Extra info for Study on Heterotrophic-Autotrophic Denitrification Permeable Reactive Barriers (HAD PRBs) for In Situ Groundwater Remediation
Sample text
2009), but the main disadvantage of low pHs is the release of ammonium as a major undesirable nitrogen product. 2þ 5Fe0 þ 2NOÀ þ N2 þ 12OHÀ 3 þ 6H2 O ! 5Fe ð2:10Þ À 10Fe0 þ 6NOÀ 3 þ 3H2 O ! 5Fe2 O3 þ 3N2 þ 6OH ð2:11Þ 2þ À 4Fe0 þ NOÀ þ NHþ 3 þ 7H2 O ! 4Fe 4 þ 10OH ð2:12Þ Fe0 þ 2H2 O ! H2 þ Fe2þ þ 2OHÀ ð2:13Þ Theoretically, the rise in pH can be achieved from Fe0-based chemical nitrate reduction as well as anaerobic Fe0 corrosion (Eqs. 13). 13) (Fig. 3) could also indicate that the CR process did not progress significantly via single granulated spongy iron at weakly alkaline pHs.
4 Performance of heterotrophic denitrification (HD) in the HD incubation under an anaerobic condition: a variations of NO3-N and pH; b NO2-N and NH4-N. 4 Performance of Autotrophic Denitrification Considering the explosion and safety concerns associated with hydrogen gas, H2 was not employed to investigate the performance of AD. AD was identified by investigating the difference in performance between of AD coupled with CR (AD ? CR) and CR only. Likewise, pH caused by AD at time t (pHt,AD) was obtained by determination of the difference between AD ?
2 %) between them was attained at day 16. 3 Results and Discussion By CR By HD By AD+CR By HAD By AD By HD+AD+CR 100 90 80 70 60 σ (%) Fig. 6 The percent removal of NO3-N by chemical reduction (CR), heterotrophic denitrification (HD), autotrophic denitrification coupled with chemical reduction (AD ? CR), heterotrophicautotrophic denitrification (HAD) and the calculated percent removal of NO3-N by autotrophic denitrification (AD) and HD ? AD ? CR 41 50 40 30 20 10 0 0 4 8 12 16 t (d) generated by aerobic heterotrophs and hetetrophic denitrifers was consumed by autotrophic denitrifiers as an additional inorganic carbon source to enhance the capacity of AD (Eqs.