This paper discusses the applications of synthetic PONILIT GT-2 anionic polyelectrolyte in conjuction with ferric sulfate in a chemical wastewater treatment viz. wastewater from ceramics manufacturing. Synthetic wastewaters with different colloid concentrations were prepared and the coagulation-flocculation process followed by sedimentation and/or filtration was studied. Variables associated with the chemical wastewater composition, mixing time, and the coagulant and flocculant dose are considered in order to appreciate the process efficiency in terms of turbidity, chemical oxygen demand (COD), and color removal. The degrees are higher for turbidity and color (> 80 %) removal respectively, and, satisfactory for COD (< 50 %). An empirical model was elaborated by a third order rotatable design 2 3 type, considering ferric sulfate dose, polyelectrolyte dose, and mixing time as independent variables, while the turbidity and color removal efficiencies were chosen as optimization criteria. The empirical model was found adequate for the chemical wastewater treatment. Also, an analysis of the model was performed to find the optimal operating conditions, in order to apply this process for an efficient chemical wastewater treatment using ferric sulfate as coagulation agent and PONILIT GT-2 anionic polyelectrolyte as flocculation agent. The optimal values correspond to a ferric ions concentration of 6.093 mg/L, a polyelectrolyte dose of 0.651 mg/L, and a mixing time of 24.024 minutes for turbidity removal (95.869 %), respectively, and, to a ferric ions concentration of 6.01 mg/L, a polyelectrolyte dose of 0.69 mg/L, and a mixing time of 26 minutes for color removal (98.741 %).

This paper discusses the applications of synthetic PONILIT GT-2 anionic polyelectrolyte for chemical wastewater treatment. Synthetic wastewaters with different colloid concentrations were prepared and the flocculation process followed by sedimentation and/or filtration was studied. Variables concerning the chemical wastewater composition, temperature, mixing time, and flocculants dose are considered in order to appreciate the process efficiency (e.g., turbidity, color and organic matter removals). The removal degrees of turbidity and color are important (>80%) and, respectively, acceptable for organic matter expressed by Chemical Oxygen Demand (COD removal <45%). An empirical model was elaborated by a third order rotatable design 2 3 type, considering temperature, polyelectrolyte dose and mixing time as independent variables, while the turbidity and color removal efficiencies were chosen as optimization criteria. The mathematical model was found adequate for the chemical wastewater treatment. Also, an analysis of the model was performed to find the optimal operating conditions, in order to apply this process for efficient chemical wastewater treatment using PONILIT GT-2 anionic polyelectrolyte as flocculation agent.

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White mustard (Sinapis white) is an annual plant of the Cruciferae family originating from the Mediterranean region and is cultivated in Europe and Asia, mainly for its seeds, but also for animal feed or crop rotation. White mustard seed is also an important source of vegetable oil that can be used as fuel. The chemical composition of mustard seed (Sinapis alba) includes glucosinolate (sinalbozida, sinapina free), essential oils, fatty oils (glycerides of oleic acid, linoleic, linolenic, palmitic, stearic, arachidonic, erucic), phytosterols and polysaccharides. This paper presents the one step modeling extraction process of oil from the seeds of white mustard (Sinapis alba) using hexane as extraction solvent. Starting from the mathematical model describing the oil process extraction from the seeds of white mustard, optimum conditions for maximum efficiency were determined. The optimization process was performed using Generalized Reduced Gradient method (GRG).

The grafting of monochlorotriazinyl-β-cyclodextrin on cellulosic hemp materials provides hosting cavities that can include a large variety of chemicals for specific antimicrobial finishing. The yarns obtained after processes with simultaneous phases of wet-spinning and grafting have adequate physico-mechanical characteristics. The monochlorotriazinyl-β-cyclodextrin solution causes an increasing of hemp fibers adherence leading to yarns tenacities and elongations enhancing. Four compounds (ferulic acid, caffeic acid, ethyl ferulate and allantoin) have been included into the cavities of monochlorotriazinyl-β-cyclodextrin grafted on hemp fibers. The included derivatives have been characterized by infrared spectroscopy tests which have confirmed that the included components are efficiently hosted in the cyclodextrin nanocavities. The antimicrobial properties of the samples were evaluated by microbiological analysis which has shown that the sanogenetic properties of the hemp fibers are significantly modified by the chemical treatments.