Due to the increasing number of regulations and expenses of hazardous waste disposal, new methods are being developed and implemented to reduce the amount of hazardous waste generated, thereby achieving compliance with environmental regulations and decreasing disposal costs. This fact sheet provides information on potential waste minimization method for machine coolants. The waste streams of coolant contamination originate mainly from coolant sump changes and from coolant losses due to spills, leaks and carryout of metal chips and parts. Coolant replacement is necessary because of bacterial build-up and contamination by hydraulic fluids, i.e. tramp oil, due to leaks.
Hydraulic fluid needs to be replaced on a routine basis, also.
Contamination of coolants due to tramp lubricating and hydraulic oils results in bacterial growth, which is also a major cause of coolant degredation. Tramp oils in coolant can also affect product quality and hinder the possibility of recycling. The best method for minimizing tramp oil contamination is by practicing good house-keeping procedures such as periodic replacement of hoses, seals and wipers, and routine machine maintenance. If there is a blown hose or leak, hydraulic fluid may escape until the equipment can be shut off. Use of emergency shut-offs, either manually operated or automatic, allow for immediate shutdown of equipment in case of a sudden leak.