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Performance Evaluation of Membrane Contactors for Concentration of Fruit Juices Through Osmotic Distillation

Thesis Info

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Author

Waheed-Ur-Rehman

Program

PhD

Institute

University of Engineering and Technology

City

Peshawar

Province

KPK

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Chemical Engineering

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/11639/1/Waheed-ur-Rehman%20chemical%20engg%202019%20uet%20peshawar%20prr.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726854492

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Osmotic distillation (OD) of apple and pomegranate juices was performed with membrane contactors. In the first part of the study, apple juice was concentrated through OD process using hollow fiber module. For feed-in-fiber flow set-up, final juice concentration of 47oBrix with a water permeate flux of 0.047 kg.m-2.hr-1, while for the feed-in-shell flow arrangement, final juice concentration of 52oBrix with a water permeate flux of 0.089 kg.m-2.hr-1 was achieved in a total time of 320 minutes. Fouling effect on the performance of polypropylene hollow fiber module was evaluated for pomegranate juice concentration through OD. A final concentration of 52.0°Brix with a water permeate flux of 0.186 kg.m-2.hr-1 was achieved in a total time of 310 minutes. Morphological analysis of the membrane surface and cross sections revealed that the significant pore blockage occurred due to fouling after persistent operation. However, it was found that rigorous membrane cleaning protocol, promoted higher water permeate flux. Pomegranate juice was also subjected to OD process using PVDF and PTFE membranes in flat sheet module. Wetting behavior of the membranes was evaluated through various analytical techniques. It was found that PVDF membrane had least resistance to wetting which resulted in a lower water permeate flux of 0.208 kg.m-2.hr-1 in a total time of 24 hours. On the other hand, a nice resistance to wetting was shown by PTFE membrane. A water permeate flux of 0.935 kg.m-2.hr-1 was achieved in an operational time of 24 hours. Therefore, PTFE membrane showed an ample potential for semiindustrial/industrial scale applications.
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سید محبوب رضوی

سید محبوب رضوی
بڑے افسوس اوردکھ کی بات ہے کہ ہمارے عزیز دوست جناب سید محبوب رضوی صاحب اچانک۲۵/مارچ کو راہی ملک بقاہوگئے۔مرحوم نے اچھے خاصے ظہر کی نماز چھتے کی مسجد میں ادا کی، فراغت کے بعد سینے میں کچھ درد محسوس ہوا تو فوراً ایک رکشا کرکے گھر روانہ ہوئے لیکن ابھی گھر پہنچے بھی نہ تھے کہ مرغ روح قفس عنصری سے پرواز کرگیا۔اناﷲ واناالیہ راجعون۔
مرحوم دارالعلوم دیوبند سے فراغت کے بعد ہمہ تن دارالعلوم کی خدمت کے لیے وقف ہوگئے۔انھوں نے مختلف دفتری خدمات بڑی دیانت داری، محنت اور قابلیت سے انجام دیں۔ اُن کو مطالعہ تحقیق اورتصنیف وتالیف کااعلیٰ ذوق قدرت کی طرف سے عطاہوا تھا، وہ دیوبند کے مایۂ نازادیب محقق مؤرخ اور مصنف تھے۔ اُن کاآخری شاندار کارنامہ ’تاریخ دارالعلوم دیوبند‘ کی دو جلدیں ہیں۔ عادات وفضائل کے اعتبار سے نہایت دین دار، عابد وزاہد، معاملہ فہم، خوش اخلاق اور دیانت دار تھے۔ اس میں شبہ نہیں کہ اُن کی وفات دارالعلوم کاایک عظیم نقصان ہے۔اللھم اغفرلہ وارحمہ۔ [اپریل۱۹۷۹ء]

 

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A collection of Aḥādīth of Prophet Muḥammad (May peace and blessing be upon him) compiled by Imām Bukhārī. The Muslim scholars of past and present time gave great importance to this book by making their efforts to extract the treasures hidden in this book and to present the different approaches and benefits of this book. “Al Kawākib al-Durārī” by Imām Al kirmānī is an old explanation of Ṣaḥīḥ Bukhārī. He was among those scholars who were expert in many fields at a time like knowledge about ╓adīth, its narrators, Commentary, Qirā’t, Qur‘ānic Sciences, Islamic Jurisprudence, Arabic language, Faith, Medicine, History, Geography, Astronomy etc. ╓afiz Ibn ╓ajar who also had the specialization in science of hadith and knowledge about biographies of narrators. During studying “Fatḥ al Bārī” I found that ╓afiz Ibn ╓ajar criticized on the commentary of Al kirmānī at many times in relating different sayings and signals. In this article I studied these comments of ╓afiz Ibn ╓ajar on Imam Alkirmani a critical comparison. After research I have found that ╓afiz Ibn ╓ajar has consulted “Al Kawākib al- Durārī” and quoted Imām Al kirmānī’s commentary and added it. This article approves that judgments of ╓afiz Ibn ╓ajar on conversion and transformation of text and on distorted, additional and incomplete words in the text are more authentic than Imām Al kirmānī.

Organizational Power and Politics: Investigating the Mediating Role of Organizational Justice on Work Attitudes

Involvement of employees in politics within organization is not a new occurrence. Therefore, in history there are many events noted in which faculty and administration have actively participated in demonstrations of strikes, marches and media activities that were very frequently happenning in Universities of Sindh. This study investigates perception of politics in universities of Sindh and its negative effects on employees work related attitudes including job satisfaction, job involvement, organizational commitment, organizational citizenship behavior, turnover intentions and work-related burnout. It explores the involvement of university teaching faculty and administrative staff in politics growing the trend of politicizing the educational systems and manipulation of education for political interests. Moreover, it has been argued by many scholars that the presence of organizational justice can reduce the occurrence of political games among workers. Therefore, this study also examines the mediating role of organizational justice to check whether the presence of organizational justice and its dimensions can reduce the negative effects of politics or not. A survey has been conducted through a well-structured questionnaire among 500 respondents as well as teaching and administrative staff from different pubic universities of Sindh Province.The study concluded that there is significant relationship between perceptions of organizational politics and organizational justice. The main effects of analysis have also revealed that perceptions of politics have significant relationship with most of outcomes studied in this research. As for mediating effects of OJ on outcomes relationship, the results have shown significant mediating effects of organizational justice (OJ) with organizational politics (OP) for all outcomes except one (work related burnout).