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035 _a.b10082025
099 9 _aAIT Thesis no. 1393
100 0 _aDiep Minh Tam
245 1 0 _aAnalysis of seaweed gels and characteristics of gel extraciton wastewater
260 _aBangkok :
_bAsian Institute of Technology,
_c1978
300 _a124 p.
490 1 _aThesis ;
_vno. 1393
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science of the Asian Institute of Technology, Bangkok, Thailand
502 _aThesis (M.Sc.) - Asian Institute of Technology, 1978
520 _aAn investigation was made of three genera of seaweeds from Thailand, Gracilaria, Sargassum and Hypnea, sources of agar, algin and carrageenan, respectively. The potential gel yield of these seaweeds was assessed and their gel characteristics, namely gel strength, gelation temperature, melting temperature and color, were studied. Gracilaria seems to have a great promise of exploitation for local utilization, especially those from Chum Porn, Prachuab Khirikhan, Song Khla and Trad. The yield of Gracilaria from these locations varied from high, 30%,to very high, 51%, while their gel strength and color were equal or better than some commercial agars from Japan and the Philippines. Sargassum from Suras Thani also showed some similar promise due to its sodium alginate yield of 21 to 31%, which was generally higher than the yields reportedly obtained from the same genus in some other countries such as India and Taiwan. The Hypnea species did not possess good qualities in their carrageenan although the yield varied from low, 22%, to quite high, 46%. Only one sample from Narathiwas might have potential use in the future. The wastes from the extraction processes were found to be very polluting due to their high contents of total solids , from 5,000 to 10,000 mg/t; chemical oxygen demand values from 2,000 to 5,600 mg/t; relatively high organic matter contents as indicated by volatile solids values from 1400 to 2800 mg/t; a presence of brown color from 300 to 500 units, and some residues of formaldehyde in the case of the al gin extraction waste. Based on the results of waste characteristic analyses, a general treatment procedure was proposed.
650 0 _aSewage
_xAnalysis
650 0 _aMarine algae
700 1 _aEdwards, Peter,
_eChairperson
700 0 _aSamorn Muttamara,
_eCo-Chairperson
700 1 _aNguyen, Cong Thanh,
_eExamination Committee
710 2 _aThe Government of Japan.,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. 1393
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B23092
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