Membrane Crystallizer for Zero Discharge Seawater Desalination

• Main Author: RAMADHAN (NIM : 13014044) - FAISAL ANGGI RANGKUTI (NIM : 13014067) , DIONDY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26705
• Institution: Institut Teknologi Bandung

<p align="justify"> <br /> <br /> Seawater desalination process commonly using reverse osmosis technology which uses membrane and high pressure for water purifier. On the other hand, reverse osmosis also produce waste of salt concentrate called brine. Other methods that can be used for water purifier with zero discharge is membrane crystallization. Membrane crystallization is the method which also using superhydrophobic hollow fiber membrane technology for separating water and salt. <br /> <br /> This research was conducted using ultrafiltration membrane in form of hollow fiber with polyprolylene (PP) as the material. The feed used is the salt solution which approach the condition of real sea water with variation of NaCl concentration and solution temperature. Salt concentration varied between 3%; 4%; 5%; and 6%; temperature varied between 50-80°C with range of 10°C; and variation of air flow between 2-5 L/minute with range of 1 L/minute. The hollow fiber membranes submerged to the heated salt solution to take the vapor which going through the membrane pores and condensed. Salt content which lost by membrane calculated by measuring the conductivity of permeate with digital conductometer. <br /> <br /> In this research, we produce the permeate in form of pure water which have the varied value with range of 80-100 &#956;S/cm and the salt concentration on the permeate side is very low around 0,008%. The superhydrophobic PP membrane in this research have relatively constant flux number around 0,15-0,32 kg/m2h and rejection percent around 20%. During the experiment, membrane didn’t have wetting phenomena as shows by the value of contact angle which is constant 106° before and after experiment. <br /> <p align="justify">