MANGANESE SOLUBILITY BEHAVIOR DUE TO LEACHATE THROUGH ADSORPTION AND DESORPTION REACTIONS AS A CONTRIBUTION TO GROUNDWATER POLLUTION

• Main Author: Manguri Rahayu, Mayang
• Format: Dissertations
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/70246
• Institution: Institut Teknologi Bandung

Dissolved manganese in leachate can reduce the surrounding groundwater quality. One-Dimensional Manganese model in soil and groundwater could applied for ideal condition. Transport simulation, hydrodynamic dispersion, Manganese absorption are depends on time and pH that analyzed for model formulation. The absorption-desorption on Manganese is depending on time that considered following the empirical model of Barrow and Shaw S=k. Ctn. tm. The major innovation is considered S=o.Ctp.pH’q, where the empirical model depends on pH besides time. The assumption on the absorption-desorption model, allow model parameter to be obtained with absorption batch. Numerical techniques were used to solve the solute transport equations. Specifically for the steady state model, a correction to the numerical dispersion is presented to improve the numerical solution. Analytical solutions for a simplified case were also presented and used to test the numerical solutions of water, leachate and solute transport were tested against published data. Parameter of sensitivity analysis conducted for the steady state model shows that the influent concentration and the parameter k and also o are strongly affected by time and pH. The above solute transport equations which assume that the contact time between the entire soil is in the column and solute starts when the leachate entered into the solute were also corrected by initiating contact time for every segment in the change of L (the shadow column), when the soil solvent is greater than zero. Numerical solution of the solute transport equations with corrected contact time is compared to soil characteristics. Batch experiments, mathematical modeling with validations were conducted to verify the applicability of the model. For ideal steady state condition, Manganese (II) transport potency under water flow are examined through pH and Eh. The experimental results show that Barrow and Shaw (1979) and Notodarmojo (1992) models can be developed into the time taken and pH mathematical function in which the sum of two Absorption-Desorption condition will reach equilibrium condition. The transport model formulated in this study adequately describes the movements of Manganese (II) and Manganese (IV) through absorption and desorption in Supit Urang’s Soil. From 3 samples A, B, and C shows that the soil characteristics were different, sample A is clay-loam soil, B soil is silt clay loam soil and C soil is silt clay soil. Those models have the advantage of being able to measure the effect of time and changes in soil pH that affect manganese compound. The drawbacks and limitations of this research are because the research was conducted in a laboratory, not on the groundwater system as depicted in the field on the right, the leachate used was artificial leachate not from leachate ponds in the field, validation was carried out on a laboratory scale indirectly in the field and research to achieve analysis numbers was carried out with batch absorption, modeling simulation were used in 1 dimension as in ideal conditions. There are many other compounds that can be used as pollutant parameters which have different characters and valences such as Mn, for example iron, pollutant transport modeling is developed into non-ideal conditions and considers the Absorption-Desorption factor as a function of time and pH.