Journal
CHEMICAL ENGINEERING JOURNAL
Volume 345, Issue -, Pages 22-30Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.03.087
Keywords
Agricultural biomass; Constructed wetland; Carbon source; C/N ratio; Nitrogen removal
Categories
Funding
- Water Resources Science and Technology Program of Shaanxi Province [2017slkj-6]
- National Science Foundation of China (NSFC) [51508466]
- Fundamental Research Funds for the Central Universities [2452016067]
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The poor nitrogen removal due to the low denitrification caused by lack of carbon sources in vertical flow constructed wetlands (VFCWs) especially for treating low carbon sewage. In this study, agricultural biomass materials including wheat straw, apricot pit and walnut shell had been tested as substrates in intermittentlyaerated VFCWs for enhancing the nitrogen removal, and the effect of C/N ratios on the nitrogen removal was also studied. The results showed that intermittently-aerated VFCWs by adding agricultural biomass could intensify the denitrification process significantly, and the system with wheat straw performed much better than the systems with walnut shell and apricot pit. Four microcosms with different agricultural biomass showed different trends with the rising C/N ratio of influent. Moreover, the best removals (COD 97%, NH4(+)-N 99% and TN 96%) have been obtained at an influent C/N ratio of 0.5, which indicated that the dosage of biomass addition and influent C/N should be further optimized for achieving the sustainable nitrogen removal in VFCWs for low carbon wastewater treatments.
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