Optimization of combined microwave pretreatment–magnetic separation parameters of ilmenite using response surface methodology

2012 ◽  
Vol 232 ◽  
pp. 58-63 ◽  
Author(s):  
Guo Chen ◽  
Jin Chen ◽  
Jun Li ◽  
Shenghui Guo ◽  
C. Srinivasakannan ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Magnetic Separation ◽  
Microwave Pretreatment ◽  
Separation Parameters

scholarly journals Optimization and Modelling of Turbidity Removal of Sewage using High-Gradient Magnetic Separation (HGMS) by Response Surface Methodology (RSM)

2020 ◽  
Vol 28 (4) ◽  
Author(s):  
Nur Sumaiyyah Supian ◽  
Johan Sohaili ◽  
Nur Farhan Zon
Keyword(s):  
Stainless Steel ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Magnetic Separation ◽  
Suspended Matter ◽  
Circulation Time ◽  
Small Range ◽  
Steel Wool ◽  
Turbidity Removal ◽  
Suggested Approach

Endless industrial development and growing society occasionally create an enormous volume of wastewater, which leads to some issues on wastewater treatment. Existing conventional screening processes have various limitations and drawbacks. Therefore, this study investigated the use of a combination of non-corrosive stainless steel wool and a permanent magnet to increase magnetic gradient, hence reducing suspended matter in sewage through turbidity test. An approach for optimizing the reduction of suspended matter through turbidity analysis was conducted using central composite design (CCD) under response surface methodology (RSM). Three critical independent variables, such as magnet strength, circulation time, and steel wool, and turbidity removal as the response, were further studied to analyze their interaction effects. As a result, an optimal value of turbidity removal was found at 90.3% under the specified optimum conditions of magnet strength of 245 mT, 116 g of non-corrosive stainless steel wool, and 16 h of circulation time. Statistical analysis had shown that the magnet strength, circulation time, and steel wool significantly affected the turbidity removal performance. Furthermore, design of experiment was significantly verified by a small range of error between predicted and actual data. Consequently, a higher gradient of magnetic separation was proven to effectively remove suspended matter using inexpensive non-corrosive stainless steel wool without using magnetic adsorbent. Thus, the suggested approach was found to be cost-effective and environmentally friendly for sewage treatment.

Microwave Pre-Treatment of Corn Straw and its Enzymatic Hydrolysis

2013 ◽  
Vol 641-642 ◽  
pp. 971-974
Author(s):  
Mu Xin Han ◽  
Dong Mei Li ◽  
Yu Jie Feng ◽  
Yu Fei Tan ◽  
Yi Xing Yuan
Keyword(s):  
Response Surface Methodology ◽  
Enzymatic Hydrolysis ◽  
Response Surface ◽  
Microwave Power ◽  
Processing Time ◽  
Enzyme Hydrolysis ◽  
Corn Straw ◽  
Microwave Pretreatment ◽  
Optimum Parameters ◽  
Pre Treatment

To enhance enzymatic hydrolysis efficiency of the corn straw, a process microwave pretreatment of corn straw was optimized using response surface methodology (RSM). Estimated optimum parameters were as follows: water to corn straw ratio is 58:1, microwave power is 640w and processing time is 5 minutes. Under these conditions, a maximum enzyme hydrolysis ratio of corn straw (49.25%) after microwave pretreatment was reached.

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