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Optimum Effect of Factors Influencing on Sacrificial Cathodic Protection for Steel Wall
امثلیة العوامل المؤثرة على الحمایة الكاثودیة بالتضحیة لجدار الفولاذ

Authors: Mohammad H. Hafiz --- Wissam K. Hamdan --- Saad E. Kaskah
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2012 Volume: 30 Issue: 18 Pages: 3154-3163
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The Box-Behnken Design (BBD) is used to model the sacrificial CathodicProtection System (SCPS) to find the factors effectiveness behaviour. For protectionpotential assessment the BBD receives (resistivity of environment, sacrificial anodealloy, distance between anode and cathode and surface area for the structure to beprotected) as input and gives the protection potential as output. By applying BBDwith their analysis tools we get many results. The important results which are thefactors individual effectiveness on the sacrificial cathodic protection (SCP) processare the resistivity which has the greatest effect on the potential protection (rank=1)followed by sacrificial anode alloy type (rank=2), surface area for structure protectedrequired (rank=3) and distance between anode and cathode (rank=4). The interactionof sacrificial anode alloy and cathode area (χ2χ4) has significant effect on CP processwith the limits which are used in this work while the other factors interaction (χ1χ2,χ1χ3, χ1χ4,χ2χ3, χ3χ4) has insignificant effect on the limits which used in this work.

لنمذجة نظام الحمایة الكاثودیة بالتضحیة احصائیا لایجاد سلوك تاثیر BBD استخدمت طریقة المقاومیة الوسط، سبیكة الانود المضحي، المسافة ) BBD العوامل. لتقییم فولتیة الحمایة استقبلت البین الانود والكاثود، المساحة السطحیة للبنیة المحمیة) كمدخلات واعطت فولتیة الحمایة كمخرجات.وادوات التحلیل الخاصة بھا . اھم النتائج للتاثیر المنفرد للعوامل على عملیة BBD بتطبیق الالحمایة الكاثودیة بالتضحیة ھي المقاومیة التي امتلكت التاثیر الاكبر على فولتیة الحمایة (المرتبةالاولى) یلیھا نوع سبیكة الانود المضحي (المرتبة الثانیة), المساحة السطحیة للانود المضحي(المرتبة الثالثة) والمسافة بین الانود والكاثود (المرتبة الرابعة). التاثیر المشترك لسبیكة الانودامتلك تاثیر قوي على عملیة الحمایة الكاثودیة ضمن الحدود التي (χ2χ المضحي ومساحة الكاثود ( 4امتلكت (χ1χ2, χ1χ3, χ1χ4,χ2χ3, χ3χ استخدمت في ھذه الدراسھ. بینما باقي التاثیرات المشتركة ( 4تاثیر ضعیف على عملیة الحمایة الكاثودیة ضمن الحدود التي استخدمت في ھذه الدراسة.


Article
Indirect Electrochemical Oxidation of Phenol Using Rotating Cylinder Reactor

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Abstract

Indirect electrochemical oxidation of phenol and its derivatives was investigated by using MnO2 rotating cylinder electrode. Taguchi experimental design method was employed to find the best conditions for the removal efficiency of phenol and its derivatives generated during the process. Two main parameters were investigated, current density (C.D.) and electrolysis time. The removal efficiency was considered as a response for the phenol and other organics removal. An orthogonal array L16, the signal to noise (S/N) ratio, and the analysis of variance were used to test the effect of designated process factors and their levels on the performance of phenol and other organics removal efficiency. The results showed that the current density has the higher influence on performance of organics removal while the electrolysis time has the lower impact on the removal performance. Multiple regressions was utilized to acquire the equation that describes the process and the predicted equation has a correlation coefficient (R2) equal to 98.77%. The best conditions were found to get higher removal efficiency. Removal efficiency higher than 95% can be obtained in the range of C.D. of 96-100 mA/cm2 and electrolysis time of 3.2 to 5 h. The behavior of the chemical oxygen demand (COD) mineralization denotes to a zero order reaction and the rate of reaction controlled by active chlorine reaction not by mass transfer of phenol towards the anode.

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