01841nas a2200241   450000500170000000800410001703500150005810000290007324501230010226000520022530000220027749000260029950001060032550200520043152008400048365000360132365000270135970000340138670000480142070000370146871000360150581000580154120260818090150.0291098s1983    th      r     000|  eng d  a.b101896581 aBamayi, Wladimir Askinin10aDesign criteria development of rotating biological contactor and anaerobic (upflow) filter system for sewage treatment  aBangkok :bAsian Institute of Technology,c1983  a57 leaves :bill.1 aThesis ;vno. EV-83-4  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering  aThesis (M.Eng.) - Asian Institute of Technology  aThe study is performed to find a suitable low cost system for the treat-  ment of domestic sewage. The possibility of using anaerobic filter, rotating  biological disk and their combination was studied.  From the anaerobic filter performance at varying hydraulic loading rates  (1.41, 1.764, 2.45 m3/m2.d), it was found that beyond a hydraulic loading rate  of 1.764 m3/m2.d, the COD removal efficiency was not satisfactory. The filter  depth of 120 cm (2-2.5 cm broken stone) was necessary to achieve a reasonable  COD removal.  The RBC performance at different hydraulic loading rates (0.03, 0.06 and  0.12 m3/m2·d) indicated that the removal efficiency lies in a range of 72 to  82%.  The detailed capital and operational and maintenance cost calculation  also favour the RBC compared to the AF and the combination of RBC and AF.   0aWaterxPurificationxFiltration 0aFilters and filtration1 aVigneswaran, S.,eChairperson0 aChongrak Polprasert,eExamination Committee1 aFude, I.,eExamination Committee2 aASEAN-USADA,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-83-4