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Performance of a new low-cost Zn/Fe-layered double hydroxide-modified ceramsite for the removal of P from agricultural runoff
- Source :
- Ecological Engineering. 159:106117
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Modified ceramsite has been widely reported as a P adsorbent in wastewater treatments; however, its performance in removing P from agricultural runoff is unclear. A new low-cost ceramsite is modified in this study applying Zn/Fe-layered double hydroxides (LDHs; CZF) to investigate its practicality in treating P-polluted agricultural runoff. The results revealed that the CZF has a theoretical maximum P-adsorption capacity of 11.2 mg-P g−1. Various factors in P-adsorption performance followed the order of pH value (−22.6) > Ca2+ (21.5) > Mg2+ (19.9) > CO32− (−14.5) > SO42− (−13.3) > humic acid (−10.7) > NO3− (−5.57) > Cl− (−2.93) > Na+ (0.32) > NH4+ (0.19). Through iterant adsorption/regeneration, CZF cyclically reduced P concentration in agricultural runoff from 0.58 mg-P L−1 to below 0.1 mg-P L−1 under the preferred parameters of 20 g L−1 dosage, 2 h adsorption time at pH 7.2, and 1 h desorption time at pH 13.0. The treated water has low luminescence toxicity as well as low leaching risks of embedded Zn and adsorbed P in the spent CZF. Additionally, the CZF packing module significantly decreased P in agricultural runoff within four weeks. The CZF dosage and hydraulic retention time (HRT) prolonged the effective operating time (EOT) for P removal, whereas the total organic carbon (TOC) concentration had a negative impact. The cost of CZF for removing P from agricultural runoff was as low as 0.45 ¥ m−3. Overall, this research indicates that using CZF as the adsorption substrate in a ditch purification system is an effective approach for mitigating P pollution in agricultural runoff.
- Subjects :
- Total organic carbon
Pollution
Environmental Engineering
Hydraulic retention time
media_common.quotation_subject
Substrate (chemistry)
04 agricultural and veterinary sciences
010501 environmental sciences
Management, Monitoring, Policy and Law
01 natural sciences
chemistry.chemical_compound
Adsorption
Wastewater
chemistry
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Hydroxide
Leaching (agriculture)
0105 earth and related environmental sciences
Nature and Landscape Conservation
Nuclear chemistry
media_common
Subjects
Details
- ISSN :
- 09258574
- Volume :
- 159
- Database :
- OpenAIRE
- Journal :
- Ecological Engineering
- Accession number :
- edsair.doi...........c26d616359dbe5d5b2755ecdb130965c