Electrochemical pretreatment of coking wastewater by Ti/BTN/RuO2-IrO2-TiO2: Selectivity of chloridion oxidation and multi-response optimization

Coking wastewater is a kind of recalcitrant wastewater including complicate compositions. Advanced treatment of coking wastewater by Fenton-Like reaction using pyrite as catalyst was investigated in this paper. The results show that the chemical oxygen demand (COD) of coking wastewater decreased significantly by method of coagulation combined with two-stage oxidation reaction. COD of wastewater can decrease from 250mg/l to 45mg/l after treatment, when 2g/L pyrite was used in each stage oxidation and the dosage of hydrogen peroxide (H2O2) is 0.2ml/l for first stage treatment, 0.1ml/l for second stage treatment respectively. The pyrite is effective to promote Fenton-Like reaction with low cost due to high utilization efficiency of H2O2, moreover, catalyst could be easily recovered and reused. The Fenton-Like reaction might be used as a potential alternative to advanced treatment of recalcitrant wastewater.

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Multi-Response Optimization of Mechanical Properties of Al reinforced by Al2O3 and/or SiC using Grey Relational Analysis

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/671/1/012012 ◽

2020 ◽

Vol 671 ◽

pp. 012012

Author(s):

Haneen Hameed Hlail ◽

Saad Hameed Al-Shafaie

Keyword(s):

Mechanical Properties ◽

Grey Relational Analysis ◽

Relational Analysis ◽

Response Optimization ◽

Grey Relational

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Structure Sensitivity Analysis and Dynamic Performance Optimization of Marine Gearbox

Volume 10: 2017 ASME International Power Transmission and Gearing Conference ◽

10.1115/detc2017-67072 ◽

2017 ◽

Author(s):

Tengjiao Lin ◽

Daokun Xie ◽

Ziran Tan ◽

Bo Liu

Keyword(s):

Sensitivity Analysis ◽

Performance Optimization ◽

Optimization Design ◽

Dynamic Performance ◽

Structure Sensitivity ◽

Superposition Method ◽

Structure Parameters ◽

Analysis Model ◽

Vibration Acceleration ◽

Response Optimization

The aim of this paper is to investigate the influence of structure parameters on the vibration characteristics and improve the dynamic performance of marine gearbox. A finite element model was established to solve the dynamic response by using modal superposition method. Based on the theory of multi-objective optimization design, the structure sensitivity analysis model of marine gearbox was established, which takes the structure parameters of the housing as design variables. The modal and response sensitivity was obtained by using the optimal gradient method. According to the results of sensitivity analysis, a modal and response optimization model of marine gearbox was established. The objective was to avoid natural frequencies from the excitation frequencies and minimize the root mean square of vibration acceleration of the evaluating points on the surface of housing. Then the modal optimization and response optimization of gearbox were carried out by using zero-order and first-order optimization method. The results indicate that the dynamic optimization of the gearbox can be achieved. After optimization, the amplitude of vibration acceleration of the evaluating points on the housing surface has been reduced and the resonance of marine gearbox can be avoided.

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