Emission of anions and cations from pyrolysis product of sludge after ashing

Abstract

© 2019, Institute of Advanced Scientific Research, Inc.. All rights reserved. In this paper we investigated the emission of anions and cations from potential sorption material obtained by pyrolysis from sludge treated with "dry" ashing. The use of a solid pyrolysis product of sludge after ashing involves the purification of sewage from pollutants. The content of macro-ions in the aqueous extraction of solid pyrolysis products was determined by ion chromatography. By mass concentration in order of decreasing its value, macro-ions are arranged in the following order: SO42-, Ca2+, Mg2+, Na+, Cl-, PO43-, К+, NH4+, NO3-, F-. A number of priorities in order of decreasing the numerical value of the coefficient Kww in relation to wastewater: SO42-, PO43-, Na+, NH4+, NO3-, Cl-. The obtained results show that the aqueous extracts of solid pyrolysis products of sludge under investigation after treatment with "dry" ashing do not exceed the normative indices for sewage by the content of macro-ions. The toxicity of pyrolysis products by biotesting was studied according to the methodology for determining the toxicity of aqueous extracts from soils, sewage sludge and waste, drinking water, sewage and natural water by the mortality of the Daphnia magna Straus test facility. The hazard class of pyrolysis products of sludge is determined after treatment. It has been established that the solid pyrolysis product of sludge after treatment with ashing does not pollute the wastewater. This justifies the possibility of applying from environmental positions with limiting the discharge of wash water directly into fishery water reservoirs.