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008 th eng
035 _a.b11686844
099 9 _aAIT Thesis no. EV-97-14
100 0 _aChou Phalla
245 1 0 _aProblems of water purification caused by algae and their counter measures
260 _aBangkok :
_bAsian Institute of Technology,
_c1997
300 _a103 leaves
490 1 _aThesis ;
_vno. EV-97-14
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resource and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1997
520 _aA colossal concern to the water supply has been occurred by eutrophication of water source. Algae are the great precursor to create this extensive problem. The present study has aimed to assess the troubles caused by green algae Oocystis sp. in the conventional water treatment process of coagulation and flocculation. This process was used to evaluate the removal efficiency and to understand the bad effect caused by algae. The present of algae were found that the optimum dose of alum has increased from 100 mg/I to 200 mg/I. and the turbidity removal has decreased from 98.7% to 96% with the increase of chlorophyll-a from 0 to 0.15 mg/I in sample water. Residual concentration of aluminum in drinking water treatment by the solubility diagram based on known chemical equilibrium reaction with coagulant can not be used directly due to various reasons. Practical diagrams, showing the range of residual aluminum as function of pH and chlorophyll-a were derived from various jar test data, show that the high chlorophyll a caused more residual aluminum in supernatant and the least residual aluminum in the alkaline condition. Present of chlorophyll-a which was used as the indicator of biomass also has highly influenced on the floe characteristics of the clay suspension. The observation was found that the settling velocity of clay floe was faster in the low concentration of chlorophyll-a in the surface water when coagulation and flocculation take place. Algae seem to interfere the stabilization of the clay particle.
650 _aWater
_xPurification
_xCoagulation
700 1 _aIshibashi, Yoshinpobu,
_eChairperson
700 1 _aEckhardt, Ing. Heinz,
_eExamination committee
700 0 _aPreeda Pakpian,
_eExamination Committee
710 2 _aWorld Bank (UNDP/ ESCAP),
_eScholarship donor
710 2 _aGovernment of Cambodia,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. EV-97-14
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B13921
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