Balance scheme for calculating technological discharge indicators during the production of paper, cardboard and CTMM by an integrated pulp and paper mill

The calculation of technological standards for discharges includes the identification of objects of technological regulation. Objects of technological regulation are part of the object of negative impact and, as a rule, include production chains for the production of commercial products. The main products may include the production of: unbleached and bleached cellulose, paper, cardboard, bleached and unbleached chemical-thermo-mechanical pulp. One of the stages in calculating technological discharge standards integrated by the pulp and paper mill is the determination of the actual masses of pollutant discharges from technological standardization facilities, taking into account wastewater treatment at local and on-site treatment facilities. The paper examines a balance model for the discharge of pollutants after general plant treatment facilities during the production of paper, cardboard and CTMM by an integrated pulp and paper mill. The first object of technological standardization (OTN) (paper production) will be standardized on bleached cellulose, the second OTN (cardboard production) will be standardized on unbleached cellulose, the third OTN (production of CTMM) will be standardized on the production of wood pulp. This calculation can be performed by developing a balance sheet model. The material balance method is used to estimate emissions into the environment from a technological process or a piece of technological equipment and takes into account the quantities of a substance entering and leaving the process, as well as its decomposition in the technological process. The optimal values of technological indicators can be determined using the formulas proposed in the article. Cardboard and paper are a composition of fibrous semi-finished products, therefore, it is necessary to first calculate the technological indicators of discharge for the production of unbleached softwood pulp, bleached softwood pulp, bleached hardwood pulp and, in accordance with the composition, calculate the technological indicators and, in accordance with the efficiency of the treatment facilities, obtain the final values technological indicators. Based on the calculation results, graphs were constructed showing the contribution of each production process to the technological discharge standard.

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