Toxicological characteristics of sewage sludge cards of Kazan
Keywords:
sewage sludge, toxicity, infusoria, crustaceans, wheat, hazard class, класс опасностиAbstract
Toxicological characteristics of sewage sludge cards of municipal unitary enterprise «Vodokanal» of Kazan were studied. Sewage sludge cards have been identified, the precipitation of which has the strongest negative impact on the test objects. It is shown that
regardless of the spatial location within the card and the depth of occurrence, the toxicity of sewage sludge remains approximately at the same level. There is no relationship between the toxicity of sludge, depth, and its localization within a particular card. The relationships between the content of organic substances (according to COD and BOD5) in the water extract from the sediments of old cards and their toxicity in relation to the test objects Ceriodaphnia affinis and Triticum vulgare were established. Sewage sludge
belongs to the IV-V hazard class, which allows its use as fertilizers, in landfills, for the reclamation of disturbed land.
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