CASE STUDY # 188
1. Headline: Improving Operating Conditions
2. Background: See below.
3. Cleaner Production Principle: process modification
4. Description of Cleaner Production Application: A steam
jet ejector has been used to remove moisture from the
reactor tank prior to introducing the raw materials.
By removing the moisture from inside the tank, product
quality has increased and the amount of waste generated
was reduced by 42%. Steam is used because the plant
has excess steam capacity. After the steam exits the
ejector, it is used to preheat another process stream
before it is condensed in a heat exchanger.
Cross-Industry Application - all that preclean the
reactors
Case Study Summary
Incentives:
Economic incentives
Results of Application: 42% reduction in the quantity
of waste generated
Effects on Products: Improved product quality
5. Economics
Investment cost:
$325 (1988)
Payback time:
0.05 years (20 days)
Balances & Substitutions
Wastes generated
45,240 lb/yr (before) 26,240
lb/yr (after)
6. Advantages
Economic Benefits: 5,940 $/yr net annual savings
Liability reduction: reduced liability resulting from
reduced quantity of waste generated
Regulatory compliance: source
reduction
7. Constraints: No information provided.
8. Contacts and Citation
Citation:
Author: Waste Advantage, Inc.
Title: Industrial Waste Prevention. A
Guide To Developing An Effective Waste
Minimization Program.
Date of Publication: April 1987
9. Keywords: process modification, steam jet, tank, ejector,
cleaning
10. Reviewer's Comments: This case study was originally
abstracted from the publication cited above for the US
EPA's Pollution Prevention Information Clearinghouse. It
underwent a UNEP IE funded review in 1994 for quality and
completeness. It was edited for the ICPIC diskette in
July 1995.
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