Research Papers by David Hasson

The present paper describes pilot plant development of a novel process enabling increase of water recovery in brackish water desalination without using any chemicals. This is achieved by precipitating the scaling salts of a carbonate-rich concentrate by increasing the pH through air stripping of CO2

The possibility of alkaline scale precipitation and removal by electrolytic devices has long been recognized. The scale removal principle of the electrochemical technique is based on the creation of a high pH environment around the cathode by water and oxygen reduction reactions which release hydrox

Many scaling species such as CaCO3, Mg(OH)2 and Ca3(PO4)2 present in brackish and wastewater feeds can be removed by precipitation processes induced by raising the pH level of the raw water. These processes require dosage of alkaline chemicals such as NaOH, lime or magnesia. An interesting possibili

Desalination of brackish water containing silica at high recovery levels leads to a rapid flux decline, due to the precipitation of a colloidal solution consisting of polymerized silica nano-particles. The critical flux (CF) phenomenon postulates that there is a certain permeate flux level below whi

This paper describes laboratory techniques for characterizing the permissible water recovery fraction in RO desalination, which is limited by the need to avoid scale deposition on the membrane. The CaSO4 scaling system was adopted for the development of these techniques. An upper water recovery boun

Seeking economic solutions for the pre-treatment of polluted waters is at the forefront of current reverse osmosis (RO) desalination research. The modern trend is to remove the polluting species by various UF/MF membrane pretreatment schemes. This paper describes progress in an ongoing project aimin