Designing waste water treatment plant for Chromatic paint (U) LTD
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The study was carried out to design a wastewater treatment plant for Chromatic paint (U) limited. Chromatic paint being a starting company is located in a small area which does not allow any further expansion and therefore could not establish waste treatment plant and hence the need to design waste water treatment plant since they have a hope of relocating to a better area and developing the company. Some samples of waste water was collected from Chromatic paint (U) limited and analyzed experimentally to determine pH, color, turbidity, total dissolved solids, chemical oxygen demand and biological oxygen demand. This was done to determine how much their waste is contaminated so that the best design method can be established in the plant. After sample analyses of the paint waste water, the best method of treatment identified was combination of chemical and biological processes because the research indicates that the combination of coagulation flocculation and biological process is an efficient alternative in the treatment of Paint Manufacturing Waste. However, the combination of chemical and biological process generates a clear effluent with residuals Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) of 680 and 112 mg/L, corresponding to 96 and 92.5% removal rates, respectively. Aerobic biological treatment using feed batch operation permits a COD removal rate of COD = 873 mg/L, and an average growth yield coefficient of 0.3 g of biomass / g COD. The other part of the project was to develop block flow diagram, process flow diagram, material and energy balance, economic evaluation, design calculations and sizing some major equipment used in the plant that covers a capacity of 60000cm3/day.