| Summary: Treatment and reuse of wastewaters and dispersal into environment with harmless impacts due to water sources have been decreasing gradually is one of the significant environmental concern in the globalized and industrialized world with the technologic developments. In this study, the wastewater treatment plants designed according to wastewater characteristic and effects of changes of these parameters on treatment plants design were analyzed. In the first chapter, information about wastewater characteristics and their hazardous effects were given. Pollution levels caused by the wastewaters were investigated. Biochemical oxygen demand (BOD) is one of the essential indicative pollution parameter. Measurement techniques and mathematical methods for the calculation of the ultimate biochemical oxygen demand (L) and reaction rate constant (k) values of BOD were discussed. Wastewater treatment methods to be applied in relation with the wastewater characteristics were described. In the second chapter, BOD parameters obtained from series method, one of the mathematical method of calculating the ultimate biochemical oxygen demand and reaction rate constant values of 5 days BOD data obtained from respirometric and dilution techniques and a comparative study between series method and the other mathematical methods carried out. The BOD5 and BOD (L) values obtained from these methods were used in order to design the wastewater treatment plants with C++ programming language and the results were shown with tables and graphics. According to the obtained results, computer programs are very useful tools and provide big facilities on treatment plants design. The analytical results showed that the treatment plants dimensions increased in proportion to BOD values. It is better using ultimate BOD values for treatment plant design instead of 5 days BOD5 values. The method of moments provides better results than the other methods. Series method gives close results to the method of moment for calculating ultimate BOD. Key Words: BOD, Respirometer, Wastewater Treatment Plant, Active Sludge, RBC, Aerated Lagoons, C++ |
