Abstract
It is established that the environmental impact caused by purified wastewater at wastewater treatment plants (WWTP) is determined by several factors: the performance of purification plants, the volume and degree of wastewater pollution, the specificity of the pollutants removed and the purification capacity of WWTP. The highest degree of wastewater treatment is achieved at the water treatment plant "Regia Autosalubritate". A high level of environmental pollution is caused by wastewater from the "Vinăria Bardar" S.A. and treated at the local station. Exceedances for CCO-Cr are 1.61 times for the first case and 1.04 times for the second case. For CBO5, the excedances are 2.54 times and 1.82 times, respectively. The water from the “Negară Vasile” pond indicates that after dissolved oxygen, CCO-Cr, ammoniacal nitrogen and nitrite nitrogen, it corresponds to quality class II, according to the content of nitrate and chloride nitrogen - to class I, according to the sulfate content - in class V, total iron - in class IV and after zinc content - grade III quality. An essential impact on Chisinau treatment plant is caused by JSC "JLC" Lactate, Chisinau municipality, where the concentration of all wastewater pollutants discharged into the sewerage exceeds the allowable limit values.
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