03021cas|a2200241 i 450000500170000000800410001703500150005810000170007324501270009026000520021730000150026949000270028450001550031150200580046652018810052465000470240570000300245270000450248270000430252771000850257081000590265585600650271420260818171925.0230399s1994    th  uzm rtt  00|  a1eng d  a.b105027741 aGoel, Rajeev10aPilot-scale trials for the anaerobic treatment of polyester fiber wastewater to evolve an on-line process control strategy  aBangkok :bAsian Institute of Technology,c1994  a114 leaves1 aThesis ;vno. EV-94-09  aA thesis submitted in partial fulfillment of the requirements for the degree of  Master of Engineering, School of Environment, Resources & Development  aThesis (M.Eng.) - Asian Institute of Technology, 1994  aThis experimental study was undertaken on two type of anaerobic pilot scale reactors  installed in the premises of a synthetic fiber producing industry. Fixed bed and contact tank  reactors of size 3500 l each were used in the study. Contact tank reactor was started by  inoculating with sludge of septic tank origin. On the other hand, no seeding was used for the  fixed bed reactor as it contained sludge because of its previous operation in treating  slaughter house wastewater.  Both, the reactors were operated under varying COD loading at different hydraulic  retention time (HRT). During the failure of the reactor under higher loading, an increase  in the concentration of propionic and butyric acid inside the reactors was observed. This is  contemplated to be the major cause of process upset. The maximum organic loading of 2.2  kg COD/m3 .d at HRT of 4.5 days for the fixed bed and 1.3 kg COD/m3 .d at HRT of 7.8  were achieved under stable conditions. Poor immobilization of biomass in the contact tank  as compared to the Fixed bed reactor was achieved and this resulted in difference in  maximum achievable organic loadings.  The batch activity tests are found to be an effective tool to assess the methanogenic  activity of the sludge and predicting the state of the reactor. But, inadequate methods of  assessing the biomass concentration inside the reactors are seen as a limitation.  Simplified process control strategies for detecting the process changes are defined  using major process parameters like COD loading, pH, Gas production rate and the  concentration of Volatile Fatty Acids. But, these are seen to be inadequate as the proper  control action are not defined to run the process optimally. An adaptive control strategy is  developed which can be computerized for on-line monitoring and control of anaerobic  processes for optimal operation. ·' 0aSewagexPurificationxBiological treatment1 aStoll, Uwe, eChairperson1 aWise, Donald L., eExamination Committee1 aFujii, Shigeo, eExamination Committee2 aSwedish International Development Authority (SIDA),  Sweden, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-94-09  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B15612