Desalination and Water Reuse Symposium


395409 - Development of a Mass and Heat Balance Model for Zero Liquid Discharge (ZLD) Desalination

Monday, June 4
10:30 AM - 12:00 PM
Location: Greenway EF
Co-Authors: Farah Najdawi, Fresno, California – California State Univresity Fresno; Alhasan Almakrami, Fresno, California – California State University Fresno

The freshwater which constitutes about 3% of the world water budget generally remains constant or decreases due to various activities. However, the demand on the freshwater increases every day to cope with the increasing population. As a result, the scarcity of freshwater is becoming significantly high as time passes. To meet the additional water demands for various purposes, different technologies and management practices have been proposed and developed. However, desalination which is a process of separating salt from the saline water can be considered as the main method to augment freshwater. Depending on the purpose and use of water, the desalination technology and method can vary. One of the most fundamental theory of separating salt from the saline water is to use heat to boil water until it evaporates and then condenses. However, if the separated salt is not removed efficiently and timely, it can form scale in the heating units. The scale formation can result more energy requirement and eventually system failure. The existing theory of reducing or eliminating the scale formation is to use pressurized saline water to change its boiling point. The applied pressure and hence the energy requirement can vary depending on the concentration of saline water. This study presents a model that can quantify the mass of salt and water, volume of water, and energy requirement for the zero liquid discharge for a wide range of saline water concentrations and its volumetric flow rates.

Fayzul Pasha, PhD

Associate Professor
California State University Fresno

As a Professional Engineer and Associate Professor in Water Resources Engineering, Dr. Pasha’s work focuses on energy–water nexus. Hydropower resource assessment, water conservation, energy efficiency and conservation, efficient use of water in energy generation and distribution, and above all the development of water resources are his research interests. Dr. Pasha is experienced in quantitative analysis in water resources planning and management. During his sixteen (16) years of research and professional career, he has developed different models and performed quantitative analyses for sustainable decision making in integrated water resources management using statistical methods, numerical techniques, optimization theories, and machine learning approaches. As an Associate Professor Dr. Pasha teaches water resources engineering in Civil Engineering Department at the California State University, Fresno (CSUF). Dr. Pasha has earned his Ph.D. from the University of Arizona and authored more than 50 technical articles. He can be reached at 559-278-2464 or by email at


Send Email for Fayzul Pasha


395409 - Development of a Mass and Heat Balance Model for Zero Liquid Discharge (ZLD) Desalination

Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for Development of a Mass and Heat Balance Model for Zero Liquid Discharge (ZLD) Desalination