Saving and Rational Use of Water at Enterprises Due to Rainwater

The paper presents the scientific approaches to saving and rational use of water at industrial enterprises due to rainwater, which is now practically not purified, although it contains harmful substances, including heavy metals.The studies have been performed in view of the existing problem of providing industry with service water, which is drinking water, the cost of which significantly increases and its application becomes unprofitable indicator for industrial enterprises, but it is currently impossible to abandon existing technologies. At the same time, hundreds of cubic meters of rainwater that need to be better purified before being discharged into the environment are not used. Solving the problem of water supply of industrial enterprises and the issue of rainwater purification is related to the problem of rational water use and money saving.The studies and results obtained show a real possibility to use purified rainwater as service water. Purified rainwater is softer, hence, there will be less salt deposits in pipes and cooling systems.The paper shows common approaches to solving this problem and gives recommendations on implementing advanced electrochemical technologies that reduce application of chemicals and improve management of rainwater purification process due to its automation.The issues, considered in the paper are relevant since, currently, industrial enterprises do not purify rainwater to the required regulatory indicators, which leads to uncontrolled discharge of heavily contaminated water, washing toxic substances off their territories, into the environment. At the same time, enterprises can cover the shortage of service water using purified rainwater. In this case, industrialists solve economic problem in addition to environmental