Sequential sulfur-based denitrification/denitritation and nanofiltration processes for drinking water treatment

被引:27
作者
Asik, Gulfem [1 ]
Yilmaz, Tulay [2 ]
Di Capua, Francesco [3 ,4 ]
Ucar, Deniz [5 ]
Esposito, Giovanni [4 ]
Sahinkaya, Erkan [1 ]
机构
[1] Istanbul Medeniyet Univ, Bioengn Dept, Istanbul, Turkey
[2] Istanbul Tech Univ, Environm Engn Dept, Fac Civil Engn, TR-34469 Istanbul, Turkey
[3] Polytech Univ Bari, Dept Civil Environm Land Bldg Engn & Chem, Via E Orabona 4, I-70125 Bari, Italy
[4] Univ Naples Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy
[5] Bursa Tech Univ, Dept Environm Engn, TR-16310 Bursa, Turkey
关键词
Autotrophic denitrification; Denitritation; Drinking water; Elemental sulfur; Nanofiltration; Packed bed reactor; ANOXIC BIOTRICKLING FILTER; AUTOTROPHIC DENITRIFICATION; DRIVEN DENITRIFICATION; REVERSE-OSMOSIS; NITRATE REMOVAL; NEURAL-NETWORK; PERFORMANCE; THIOSULFATE; REJECTION; SULFATE;
D O I
10.1016/j.jenvman.2021.113083
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Efficient and cost-effective solutions for nitrogen removal are necessary to ensure the availability of safe drinking water. This study proposes a combined treatment for nitrogen-contaminated groundwater by sequential autotrophic nitrogen removal in a sulfur-packed bed reactor (SPBR) and excess sulfate rejection via nanofiltration (NF). Autotrophic nitrogen removal in the SPBR was investigated under both denitrification and denitritation conditions under different NO3- and NO2- loading rates (LRs) and feeding strategies (NO3- only, NO2- only, or both NO3- and NO2- in the feed). Batch activity tests were carried out during SPBR operation to evaluate the effect of different feeding conditions on nitrogen removal activity by the SPBR biofilm. Bacteria responsible for nitrogen removal in the bioreactor were identified via Illumina sequencing. Dead-end filtration tests were performed with NF membranes to investigate the elimination of excess sulfate from the SPBR effluent. This study demonstrates that the combined process results in effective groundwater treatment and evidences that an adequately high nitrogen LR should be maintained to avoid the generation of excess sulfide.
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页数:9
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