Experts call for providing safe drinking water to KarachiitesOctober 30, 2015
KARACHI: Provision of safe drinking water is the fundamental right of people. Karachi needs supply of safe drinking water through proper treatment. Reverse Osmosis Plants remove pollutants and bacterias from untreated water, hence, there is need to install them for better human health. Desalination and thermal desalination plants are needed to be established at all levels.
This was the crux of a symposium organized by the Pakistan Academy of Engineering at a local hotel on Saturday. The symposium stressed the need for providing more water to Karachi in view of rising population and industries.
PAE’s President Dr. Ing. Jameel Ahmed Khan welcomed the distinguished guests for their participation and provided enormous knowledge about the water, its available sources and needs. Retail cost of bottled water has risen to alarming level in the country, particularly Karachi. He said that water is most abundance substance on the Earth; however, there is need to use it properly. It is most essential element of life and comprises two Hydrogen (H) elements and one Oxygen (O) element. He criticized Karachi Water and Sewerage Board for careless service.
Dr Jameel said that global water stress is intensifying due to rising population and by 2030, about 60% of the world population is expected to live in urban areas. However, he said that Global MDG target for drinking water has been met five years ahead of schedule. He said that Karachi needs safe piped water as underground water is contaminated.
He said that nothing has been done yet for rehabilitation and restoration waste water treatment in Karachi, which is matter of great concern. He said that pure water is basic human right, which needs to be provided on priority basis. He stressed the need to establish Reverse Osmosis Plants to treat brackish seawater.
Engr Nisar Ahmed said that there is need to provide treated water supply to Karachiites through treatment plants. He said that Indus River’s water contains pollutants and bacterias, which can be removed through water treatment plants. He said that Desalination Plants can provide safe drinking water; therefore, they should be established in abundance for ensuring better health to the people. He said that membranes in water treatment plants removes all pollutants. He said that industries are major consumers of water.
He said that there is mushrooming of water plants in the city, and most of them do not meet required standards. Every water filter plant should have full-fledged laboratory and Microbiologist.
Engr Anjum Kamal Alvi shed light on the importance of Tharmal Desalination Plants for providing water in Pakistan. He said that these plants could play major role in providing safe drinking water to the people. He stressed the need for enhancing installation of these plants for better human health. The participants at symposium were informed that globally 147 countries have met drinking water target.
According to a report, refineries, power plants and other industries need high purity water. The thermal desalination process uses energy to evaporate water and subsequently condense it again. When there is waste heat or sufficient electricity available, as is often the case with refineries and power plants, thermal desalination is an efficient and viable solution.
Thermal Desalination – Multi-Effect-Distillation (MED) is solutions for seawater treatment. Desalination plants separate sea and brackish water into two flows consisting of a freshwater stream (permeate in reverse osmosis, condensate in thermal processes) with a low salt content and a stream with a high salt concentration (brine or concentrate). Every desalination technology requires energy for this separation process, which is supplied to the system by thermal or mechanical means (generally as electrical power). The thermal desalination process is based on evaporation and the subsequent condensation of the steam.
A reverse osmosis plant is a manufacturing plant where the process of reverse osmosis takes place. An average modern reverse osmosis plant needs six kilowatt-hours of electricity to desalinate one cubic metre of water. The process also results in an amount of salty briny waste.