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Effect of polybrominated diphenyl ethers on sand-bentonite liner material
- Source :
- Waste Management. 89:73-82
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Polybrominated diphenyl ethers (PBDEs) are present in biosolids and other solid wastes, as well as being detected in landfill leachates. As sand-bentonite mixtures are extensively used as basal liner materials for landfills, a sand-bentonite mixture was investigated by swelling tests and leaching column tests to determine whether it can effectively contain and/or immobilize PBDEs in landfill leachate. Leaching column tests were conducted with permeants consisting of biosolids’ leachates diluted to 50% by volume and spiked with 50 μg/mL of a pentaBDE mixture solution. The results showed that the sand-bentonite retained up to 45–66% of the total PBDEs in the permeant; however, the concentration of PBDEs in the effluent increased continuously and reached a significant level during a 3-week period. PBDEs probably sorbed onto both fine and ultra-fine organic particles. During leaching, a compacted sand-bentonite admix could stop fine particles from passing, but at the same time, ultra-fine organic particles carried PBDEs through the barrier materials. The hydraulic conductivity, k, of the sand-bentonite was negatively affected by shrinkage of the clay interlayer caused by the permeant hydrophobicity. However, the hydraulic conductivity changed only to a limited extent, remaining at a magnitude of 10−9 cm/s, probably because the PBDE concentrations were low. Therefore, caution is needed when sand-bentonite is applied to landfill liners as a barrier for PBDEs.
- Subjects :
- Biosolids
Chemistry
020209 energy
02 engineering and technology
010501 environmental sciences
Silicon Dioxide
01 natural sciences
Waste Disposal Facilities
Permeability (earth sciences)
Polybrominated diphenyl ethers
Hydraulic conductivity
Environmental chemistry
Bentonite
Halogenated Diphenyl Ethers
0202 electrical engineering, electronic engineering, information engineering
Leachate
Leaching (agriculture)
Waste Management and Disposal
Effluent
Water Pollutants, Chemical
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 0956053X
- Volume :
- 89
- Database :
- OpenAIRE
- Journal :
- Waste Management
- Accession number :
- edsair.doi.dedup.....7e1fe384fec7c5140dee88b9d565e31b