A feasibility study of waste exchange in Bangpoo Industrial Estate

The objective of this research is to find the possibility of wastes exchanging among factories in Bangpoo Industrial Estate and to develop a database for further waste management in the Estate.Information on type and amount of waste generated waste, raw material used, production process and current waste management practice of factories in Bangpoo Industrial Estate was collected by using questionnaire and sampled interview. Analysis of feasibility in exchanging waste was done by considering benefits and costs ratio based on 4 scenarios. Scenario 1, the present status, is the basis of calculation. Amount of supplied waste is reduced by 20% from the basis in scenario 2. There is an increase in operation and transportation costs by 20% in scenario 3. And scenario 4 is the combination of scenario 2 and scenario 3. Benefits of waste exchange was determined in term of the amount of saving from selling waste to waste brokers, and new material costs. Costs of waste exchange was calculated from transportation and operation costs. Type and amount of wastes which have potential to be exchanged among factories in Bangpoo Industrial Estate are 450 t/y for shrimp shell & tail, 12.5 t/y for cotton scrap, 6.5 t/y for fabric scrap, 2,206.08 t/y for glass scrap, 12 t/y for poly vinyl chloride (PVC) scrap, 990 t/y for spent sand, 80.868-104.268 t/y for PP scrap, 69.75 t/y for aluminium scrap, 8,971.402-11,199.546 t/y for steel scrap, 23,106 unit/y for empty steel drum, 12.24 t/y for nylon scrap, 688.2 t/y for polyester scrap, 9-27 t/y for high density polyethylene (HDPE) scrap, and 18,023.364-18,126.44 t/y for paper scrap.The benefits and costs ratio (B/C) for exchanging waste are :Scenario 1 B/C ratio are 5.21, 2.17, 4.29, 2.29, 65.14, 24.91, 10.66, 4.94, 0.82, 3.4, 81, and 6.53 for cotton scrap, fabric scrap, glass scrap, spent sand, PP scrap, aluminium scrap, steel scrap, empty steel drum, nylon scrap, polyester scrap, HDPE scrap, and paper scrap respectively. The B/C ratio of exchanging shrimp shell & tell and PVC scrap are not calculated since these waste are currently exchanged between factories in Bangpoo Industrial Estate.Scenario 2 B/C ratio of above mentioned wastes are 4.17,1.73, 3.43, 2.75, 52.11, 19.93, 10.23, 5.13, 0.66, 2.72, 64.8, and 6.62, respectively.Scenario 3 B/C ratio of above mentioned wastes are 4.34, 1.81, 3.57, 1.91, 54.28, 20.76, 8.88, 4.12, 0.68, 2.83, 67.5, and 5.44, respectively.Scenario 4 B/C ratio of above mentioned wastes are 3.47, 1.44, 2.86, 2.29, 43.43, 16.61, 8.53, 4.23, 0.55, 2.27, 54, and 5.52, respectively.From the results of B/C ratio it can be concluded that cotton scrap, fabric scrap, glass scrap, spent sand, PP scrap, aluminium scrap, steel scrap, empty steel drum, nylon scrap, polyester scrap, HDPE scrap, and paper scrap are feasible to be exchanged among factories in Bangpoo Industrial Estate since the benefits are higher than costs for all scenarios. Nylon scrap is not feasible to be exchanged among factories in Bangpoo Industrial Estate since the costs are higher than benefits for all scenarios.