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Determination of The Optimal Dosage of Chemical Compounds in the Wastewater Treatment Process in Trang Bach Coal Mine: the Laboratory Scale

Doan Manh Ha, Mijał Waldemar

Inżynieria Mineralna

2019

R. 21, nr 1

59--62

The pH index of Trang Bach coal mine wastewater ranges from 2,8 to 6, meanwhile, the content of Fe, Mn, and turbidity & suspended solids (TSS) are rather high and it is impossible to discharge the wastewater directly to the environment. In order to achieve the requirement of QCVN 40:2011/BTNMT standard – The national standard for industrial wastewater quality after treatment of Vietnam and other purposes, the wastewater need to be treated by several methods such as coagulation-flocculation or sedimentation. In this article, we intend to find the optimal dosages of chemical compounds for the TSS, pH, Fe and Mn treatment process for Trang Bach coal mine wastewater in the laboratory modular.

Balancing Bilinearly Interfering Elements

Carfì D., Gambarelli G.

Decision Making in Manufacturing and Services

2015

Vol. 9, no. 1

27-49

Many decisions in various fields of application have to take into account the joint effects of two elements that can interfere with each other. This happens, for example, in Medicine (synergic or antagonistic drugs), Agriculture (anti-cryptogamics), Public Economics (interfering economic policies), Industrial Economics (where the demand of an asset can be influenced by the supply of another asset), Zootechnics, and so on. When it is necessary to decide about the dosage of such elements, there is sometimes a primary interest for one effect rather than another; more precisely, it may be of interest that the effects of an element are in a certain proportion with respect to the effects of the other. It may also be necessary to take into account minimum quantities that must be assigned. In Carfì, Gambarelli and Uristani (2013), a mathematical model was proposed to solve the above problem in its exact form. In this paper, we present a solution in closed form for the case in which the function of the effects is bilinear.