Biodegradable working fluid is decomposed by microbes to CO2 and H2O, and, therefore, does not have a negative impact on the environment. Base oil is primarily polyethylene glycol or vegetable oil (rape seed oil). The demand for biodegradable working fluid is particularly high for equipment used outdoors, such as excavators and tunnel linings. Table 14.9 sums up the drawbacks of and treatments for biodegradable working fluid in piston pumps. Attention needs to be paid to mineral oil left inside the system; mineral oil and biodegradable oil should not be mingled. In systems in which attachments are used, residual oil left in attachments requires especial caution.
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