000			03794nas a2200433 a 4500
005			20260819085209.0
008			170519s2015 th u m rtt 000 a eng d
035			_a.b12183969
099		9	_aAIT Thesis no.EV-15-14
100	1		_aKarger, Naqibullah
245	1	0	_aTreatment of gypsiferous soil by biological sulphate reduction process
260			_aPathum Thani, Thailand : _bAsian Institute of Technology, _c2015
300			_a73 leaves : _bill. + _e1 online resource
490	1		_aThesis ; _vno. EV-15-14
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master Science in Environmental Engineering and Management
502			_aThesis (M.Sc.) - Asian Institute of Technology, 2015
520			_aHigh gypsum content in soils of some mining areas gives adverse effects to the environment such as acid mine drainage, leachate to groundwater and may cause numerous cultivation problems in the soil, such as low fertility, high erodibility, pedon hardening, structural instability, crust formation, high runoff generation potential and low water retention capacity . The quality of such mine soils can be improved by reducing the soil gypsum content. The objective of this study is to develop a suitable in-situ bioremediation technology by using sulfate reducing bacteria (SRB) for reducing the gypsum content in the mine soils. This technology can be applied in the south western part of Afghanistan, including Kandahar, where mine soil contains high gypsum content (more than 100 g kg-1). Low or no cost organic substrates, such as; rice husk (RH), coconut husk chips (CHC) and municipal wastewater treatment sludge (MWTS)indifferent percentages (10%,20%,30% & 40% by weight) was mixed with the soil as electron donors for the SRB. The highest sulfate removal efficiency (57%) was attained in the soil mixed of 40% CHC of mixture, followed by 30% CHC (54.76%), 40% MWTS (52.07%), corresponding to a reduction of the soil gypsum contents from 15% to 6.46%, 6.79%, 7.19%, respectively. The optimum residence time for the treatment of 40% CHC mixture was 11 weeks (77days). For economic achievements, this treated soil can be further used in agriculture as a soil amendment and the liberated sulfide can be recovered as the fertilizer elemental sulfur.
650		0	_aSoils _xGypsum content
700	1		_aAnnachhatre, Ajit P., _eChairperson
700	1		_aVisvanathan, C., _eExamination Committee
700	1		_aShipin, Oleg V., _eExamination Committee
710	2		_aMinistry of Higher Education (MoHE) / Kandahar University, Afghanistan, _eScholarship Donor
710	2		_aAsian Institute of Technology Fellowship, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-15-14
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B02608
907			_a.b12183969 _bmnait _cz
902			_a240412
998			_b0 _c170519 _dm _ea _fz _g0
962			_a000:001:PDF:b1218396:003125:0:0:0:0:0:0 _tClick to view Abstract _vn
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