Combined technology of field research and modeling in the development of the rationing method pulp mill wastewater in the conditions of deep water outlets

Abstract

Abstract The algorithm and the structure of information support for the model of implementation of the method of normalization of pulp mill wastewaters for deep dispersing water outlets, taking into account the hydrological regime, are determined. The combined technology is based on a geoinformation model of a natural-technogenic complex with identification parameters based on natural data of various hydrological regimes, wind unidirectional and multidirectional currents in depth. The characteristics of the jet zone and the main dilution are evaluated in accordance with the situational water use plan of the pulp mill. The hydraulic solution of the problem of transformation of nonconservative pollutants is implemented using the model of convective-diffusion transport, based on the equation of V. M. Makkaveev, and the transformation of substances using linear mono - and nonlinear bimolecular schemes. To determine the specificity of biochemical processes, the intensity of oxygen uptake and decomposition of organic substances was estimated by direct and indirect indicators. The proposed nonlinear model allowed us to determine the degree of uniformity of water masses in the jet zone of deep water discharge in the main dilution section up to the control gate. The algorithm of identification of parameters of the estimated model the convective-diffusive transport and transformation of substances on observed data taking into account specificity of the studied processes, and used types of models of transfer and transformation of organic compounds. The main measured parameters are temperature, electrical conductivity, turbidity of water, dissolved oxygen content, BOD5, BOD20, suspended substances, nitrite ion, phenols, phosphates, lignosulfonates. Laboratory studies were carried out at various dilution multiplicities with the determination of biochemical oxidation constants used in modeling various sites in a water object.