This research highlights the dehydration of dimethyl amino ethyl azide (DMAZ), parametric optimization, and describes equilibrium and kinetics of water adsorption on 3A sieves. Central composite design (CCD) was successfully employed for experimental design and analysis of the results. It was indicated that the optimum adsorption capacity (191.3 mg/g) was obtained at contact time = 150 min, liquid/solid ratio = 10:1, initial concentration of water = 3 wt% and agitating rate = 150 rpm. Langmuir-Freundlich and intra-particle diffusion models were appropriate to describe isotherms and kinetics of dehydration, respectively. Thermal stability and regeneration behavior of the adsorbent were investigated using XRD and TGA/DSC methods. It was revealed that the best regeneration occurred in the range of 250–300 °C and the zeolite structure was stable up to 400 °C. Also, the thermal analysis verified that DMAZ molecules cannot diffuse into the aforementioned zeolite pores.
Large‐scale biomass production and sewage refining for use in landscaping by employing Chlorella vulgaris were investigated. The effects of the concentrations of carbon, nitrogen, and phosphorus as nutrients in the process were optimized by central composite design. In general, the results revealed that higher amounts of biomass can be obtained by varying the feed concentration; both the N and P concentrations have an effective role in improving the biomass dry weight. The amount of lipid productivity varied from 12 % to 55 %, and one of the photobioreactors tested showed the best conditions for lipid productivity. Also, this process can decrease the greenhouse gas emissions in wastewater treatment.
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