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008			011298s1986 th r 000| 0eng d
035			_a.b10690505
099		9	_aAIT Thesis no.EV-86-19
100	0		_aWaraporn Hirunwatsiri
245	1	4	_aThe effect of linear alkylbenzene sulfonate (LAS) in activated sludge system
260			_aBangkok : _bAsian Institute of Technology, _c1986
300			_a57 p.
490	1		_aThesis ; _vno. EV-86-19
500			_aA research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1986
520			_aThe effect of linear alkylbenzene sulfonate (LAS) in activated sludge system, focusing on its influence in COD removal efficiency was studies. Experiments have been done at different LAS concentrations, varying from 20 to 120 mg/L in continuous activated sludge process and at 20 and 40 mg/L of MBAS (Methylene blue active substance) in batch-fed activated sludge process. OECD (organization for Economic Co-operation and Development) synthetic sewage with 230-300 mg/L of COD was used throughout this experiment. In the batch activated sludge process, at 1500 mg/L of MLSS the synthetic sewage was biologically degraded mainly within the first 2 h. ninety three (93), 88 and 80% COD removal efficiencies were achieved within 3 h. corresponding to 0, 20, 40 mg/L of MBAS. In the continuous activated sludge process with 2 h. detention and 2500 mg/L of MLSS, the COD removal efficiency were 84.68, 81.33, 74.25% which corresponded to 30, 70, 120 mg/L of MBAS and 1.81, 2.25, 2.73 kg COD/ kg MLSS-d of organic loadings. The COD removal was not a result of adsorption onto the sludge since less MBAS concentration was detectable upon extraction of the sludge. The results showed that increasing LAS concentrations at the same time as increasing organic loading affected COD removal efficiency. LAS as high as 120 mg/L showed no inhibitory effect on the growth late of microorganisms in the continuous activated sludge system. It can degrade very fast and achieve 98% of MBAS removal at this concentration. In the batch-fed activated sludge system, no inhibitory effect on the growth rate of microorganism was observed at LAS concentrations as high as 40 mg/L.
650	1	0	_aSewage _xPurification _xActivated sludge process
700	0		_aSamorn Muttamara, _eChairperson
700	1		_aHanaki, K., _eExamination Committee
700	1		_aShin, Hang Sik, _eExamination Committee
710	2		_aSwiss Government, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. EV-86-19
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B19647
907			_a.b10690505 _bmnait _cx
902			_a240402
998			_b2 _c951012 _dm _ea _fx _g4
962			_a000:001:PDF:b1069050:004660:0:0:0:0:0:0 _tAbstract _vn
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