000			03658nam a2200421 4500
005			20260817172714.0
008			120399s1988 th r 0000|00eng d
035			_a.b10139072
099		9	_aAIT Thesis no. EV-88-12
100	0		_aKrerkpong Charnpratheep
245	1	0	_aChromium removal in attached-growth waste stabilization ponds
260			_aBangkok : _bAsian Institute of Technology, _c1988
300			_a86 p.
490	1		_aThesis ; _vno. EV-88-12
500			_aA thesis submitted in partial fulfilment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1988
520			_aWaste stabilization ponds (WSP) installed with attached- growth media are called attached-growth waste stabilization ponds (AGWSP). Research was conducted to investigate chromium (Cr) removal efficiency in the laboratory-scale and the pilot-scale WSP and AGWSP units after subjected to one-day Cr shock loading. The laboratory-sea 1 e ponds, operated at the hydraulic retention times (0) of 5, 10 and 15 days, were fed with synthetic waste containing Cr concentrations of 5, 10, 20 and 30 mg/L while the Cr concentration of 20 mg/1 mixed with AIT sewage was introduced to the pilot-scale ponds operated at e = 10 days. Data from the laboratory-scale and pilot-scale AGWSP units showed a better Cr removal than that of the WSP units. The attached biomass in AGWSP were found to retain the applied Cr from 30 - 65 % while 10 - 91 % were overflowed in the effluents of the WSP units. Particulate Cr was a predominant fraction of total Cr concentration in the effluents. Physico-chemical mechanisms, particularly adsorption, was found to be a significant mechanism in removing soluble Cr from the pond water. An empirical model was developed to predict the total Cr removal ~h reas a mass transfer through the adsorbing-porous media model was applied to predict the soluble Cr removal. The significant effects of the Cr shock loadings on the pond performance in terms of total dissolved organic carbon (TDOC) removal and ammonia nitrogen (NH3-N) removal were not obvious. However, most of the AGWSP units showed a better performances than the WSP units after the Cr shock loadings. Decreasing of chlorophyll ~ and suspended solid concentrations in the effluents of all units were generally observed.
650		0	_aSewage lagoons
650		0	_aSewage _xPurification _xChromium removal
700	0		_aChongrak Polprasert, _eChairperson
700	1		_aI, Fude, _eExamination Committee
700	1		_aAhn, Kyu-Hong, _eExamination Committee
710	2		_aThe Government of Australia, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-88-12
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B18882
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