Page 86 - Materials Chemistry, Second Edition

Ch002-P373623.qxd 3/22/07 5:27 PM Page 67
TABLE 2.31 Cleaner Production 67
Cost/Benefit Analysis

Factory Action Capital and Saving/y Payback
department operation ($) period
cost ($) (months)
All Improve 0 4,000 Immediate
storage
facilities
All Optimize 0 6,140 Immediate
chemical
usage
All Steam 7,895 23,700 4
condensate
recovery
All Upgrade 8,420 23,700 5
insulation of
steam and
hot water
networks
Fabric pre-treatment Counter 7,720 38,900 3
current flow
in Kyoto range
Subtotal 24,035 96,440 3
Additional measures for Improvement
Fabric pre-treatment Install shut- 6,400 7,870 10
off valves
Fabric pre-treatment Recycling 5,260 24,780 3
final wash
water
Yarn dyeing Heat recovery 14,035 18,800 9
from hot
liquors
Subtotal 25,695 51,450 6
Overall cost benefits 49,730 147,890 4

Oil and soap sector: Oil and fats recovery at oil and soap company
Tanta Oil and Soap factory is located in Tanta-Gharbiya, Egypt, covering an
2
area of 35 acres (147,000 m ) and is one of three that are owned by the Tanta
Oil and Soap Company chain. The plant was established in 1934. The Tanta
factory produces an average of 18,000 ton/y of edible oil extracted from cot-
ton seeds, sunflower seeds, and soy bean, and 12,000 ton/y of ghee using palm
and other oil seeds. The factory also produces 9,000 ton/y of glycerin and
48,000ton/y of animal fodder. The main objective of this case study is to
recover oil and fat from the industrial wastewater effluent (SEAM 1999a).