Abstract
A novel heterotrophic-autotrophic denitrification (HAD) approach supported by granulated spongy iron, pine bark and mixed bacteria was proposed for remediation of nitrate contaminated groundwater in an aerobic environment. The HAD involves biological deoxygenation, chemical reduction (CR) of nitrate and dissolved oxygen (DO), heterotrophic denitrification (HD) and autotrophic denitrification (AD). The experimental results showed 0.121 d, 0.142 d and 1.905 d were needed to completely remove DO by HAD, spongy iron and mixed bacteria respectively. Spongy iron played a dominant role in deoxygenation in the HAD. After 16 days, NO3-N removal was approximately 100, 6.2, 83.1, 4.5 % by HAD, CR, HD, AD, respectively. CR, HD and AD all contributed to the overall removal of NO3-N, but HD was the most important denitrification mechanism. There existed symbiotic, synergistic and promotive effects of CR, HD and AD within the HAD. The different environmental parameters (e.g. water temperature) showed different effects on HAD. HAD was capable of providing steady denitrification rate (1.233–1.397 mg/L/d) for 3.5 months. Pine bark could provide sufficient organic carbon, spongy iron could steadily remove DO, and microbial activity maintained relatively constant. HAD denitrification was zero order with a reaction rate constant (K) of 1.3220 mg/L/d.
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Abbreviations
- ACS:
-
American Chemical Society
- AD:
-
Autotrophic denitrification
- BD:
-
Biological denitrification
- BET:
-
Brunauer-Emmett-Teller
- CR:
-
Chemical reduction
- DO:
-
Dissolved oxygen
- DNRA:
-
Dissimilatory nitrate reduction to ammonium
- HAD:
-
Heterotrophic-autotrophic denitrification
- HD:
-
Heterotrophic denitrification
- HRT:
-
Hydraulic retention time
- MDR:
-
Maximum denitrification rate
- MNPR:
-
Maximum NO3-N percent removal
- PRB:
-
Permeable reactive barrier
- RO:
-
Reverse osmosis
- TOC:
-
Total organic carbon
- ZVI:
-
Zero-valent iron
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Liu, F., Huang, G., Fallowfield, H., Guan, H., Zhu, L., Hu, H. (2014). Heterotrophic-Autotrophic Denitrification. In: Study on Heterotrophic-Autotrophic Denitrification Permeable Reactive Barriers (HAD PRBs) for In Situ Groundwater Remediation. SpringerBriefs in Water Science and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-38154-6_2
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