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Water 2017, 9(10), 786; https://doi.org/10.3390/w9100786

Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions

1
Chinese-Israeli International Center for Research and Training in Agriculture, China Agricultural University, Beijing 100083, China
2
School of Resources and Environment, University of Jinan, Shandong 250022, China
3
Center for Agricultural Water Research, China Agricultural University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Received: 3 September 2017 / Revised: 30 September 2017 / Accepted: 10 October 2017 / Published: 16 October 2017
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Abstract

Reclaimed water is an important supplementary source for fresh water. Purification is necessary prior to utilization in order to minimize the pollution and human-health risk. A three-year experiment was carried out to study the removal of nitrogen and organics through a simulated soil aquifer treatment (SAT) system under continuous wetting and wetting/drying conditions. The removal performance of nitrogen and chemical oxygen demand (COD) was improved in the wetting/drying column. The average removal efficiencies of the three years were 51% and 78% for the NO3–N, 41% and 51% for the NH4–N, and 40% and 50% for the COD in the continuous wetting and wetting/drying columns. Nitrogen and COD removal mainly took place within the top 20 cm of the columns, which was highly correlated with the distribution of microorganisms. The amount of microorganisms was also positively correlated with the content of organic matter and dissolved oxygen (DO) in both soil columns. NO3–N can be removed effectively via aerobic denitrifying bacteria as the DO concentration was 3–6 mg/L. DO and NO3–N were simultaneously reduced as the electron acceptors for COD degradation, and DO only accounted for 40% of total electron acceptor in COD degradation for the continuous wetting column. Nitrogen and COD can be effectively and steadily removed from reclaimed water during the long-term operation of a SAT system. View Full-Text
Keywords: nitrate removal; chemical oxygen demand; reclaimed water; soil aquifer treatment system nitrate removal; chemical oxygen demand; reclaimed water; soil aquifer treatment system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pan, W.; Xiong, Y.; Huang, Q.; Huang, G. Removal of Nitrogen and COD from Reclaimed Water during Long-Term Simulated Soil Aquifer Treatment System under Different Hydraulic Conditions. Water 2017, 9, 786.

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