Agroecological assessment of wastewater sludge at waste water treatment plant of Krasnoyarsk

Sewage, i.e. the waters which passed through terri-tories of pollution (industrial, agricultural, household, storm and others), and also being in the production and household or agricultural use. The greatest impact on environment of the city of Krasnoyarsk is made by the industry and housing and communal services. Sewage treatment is one of the most important systems of envi-ronment protection against pollution. Technical designs and adaptations, i.e. treatment facilities provide cleaning of industrial, agricultural and household waste, interfer-ing with environment pollution. The assessment of agro-chemical indicators of sewage of the city of Krasnoyarsk was performed at treatment plants of Krasnoyarsk (TPK) on the right-bank (RTP) and left-bank (LTP). The main indicators characterizing the properties of sludge are humidity; the content of organic matter and total nitrogen in sediment samples; the content of heavy metals (gross form) etc. On agrochemical indicators of sewage sludge of RTP and LTP treatment facilities of the city of Krasnoyarsk dried under natural conditions on silt cards of the first and second stage conform to the requirements of SanPiN 2.1.7.573-96. With the increase in the term of endurance of sewage sludge humidity, the content of organic substances and nitrogen decreases. The content of normalized heavy metals and arsenic in sewage sludge of RTP of the first and second stage, LTP second and third of turn and in fresh forming rainfall also corresponds to the standards. In the sewage sludge of LTP of the first stage only raised contents of cadmium was established. The index of danger corre-sponds to the fourth class - low-dangerous wastes. Sewage sludge of Krasnoyarsk can be used as the ba-sis of organic fertilizers.