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Dynamic simulation plays a crucial role in process engineering, especially in designing control systems. As the interest in dynamic simulation for effective control and operation rises, the goal of the paper is to study and improve the dynamic performance of a styrene production process using simulation software to tackle various process design problems. The simulation process is carried out in four stages. In the first stage, flowsheet topology and process parameters are selected to meet the requirement of the main product. Control systems are designed for each piece of equipment in the process in the second stage. Both of the stages mentioned earlier are conducted in a steady-state environment. After finishing the second stage, steady-state simulation is complete. The third stage involves tuning control parameters of control loops in a dynamic environment. In the final stage, the performance of the system is tested by introducing disturbances in the form of pulse inputs. The results of the dynamic simulation illustrate that the control system is significantly influenced by the ethylbenzene feed flowrate disturbance. The production rate is heavily affected by the disturbance, while the production quality is assured. The average settling time of the process is 270 minutes.

Recovery of nutrients from the manure wastewater has a potential for cost saving in the treatment process. Utilizing the recovered nutrients help reducing the amount of chemical fertilizer in an agriculture. The objective of this research is recovering nutrients from pig farm wastewater via the adsorption of various zeolite and this zeolite compound as organic fertilizer in growth of Green mustard. The objective of this research is optimizing the absorption of the total nitrogen and phosphorus of zeolite under various parameters, including the zeolite weight, the adsorption time, Azotobacter addition and the aeration. Results showed that the rate of 30g zeolite with supplementation of 5ml microbial was aerated in 72 hours for the best efficiency. After 21dates of growth, combination of chemical fertilizers and organic fertilizers mentioned the great products on both height and total harvested weight.