[이집트] 최초 ZLD 플랜트 가동

아쿠아테크(Aquatech)가 설계한 수처리 시설 일부인 이집트 최초의 폐수 무방류(이하 ZLD) 시설이 가동되고 있다.

플라스틱과 고무 제품의 선두 제조·공급업체인 ETHYDCO(Egyptian Ethylene and Derivatives Company)의 알렉산드리아(Alexandria) 지방 석유생산시설에 설치된 이 시스템은 폐수 무방류 기술을 적용하여 깨끗한 물 수요를 시간당 2천600㎥에서 800㎥로 약 70% 줄였다. 이 시설은 아쿠아테크가 3년간 공정 설계를 위해 자료 연구를 바탕으로 설치된 시스템으로, 나일강(River Nile)을 수원으로 활용하여 강의 수질을 보호하도록 설계됐다.

Ethydco는 현재 이곳 석유정제 부지에서 에틸렌과 다른 석유 파생물을 생산하며, 공정에서 배출되는 폐수 및 냉각탑의 블로우다운(blowdown)을 처리해 냉각탑의 보급수(make-up water)와 보일러의 유입수 등에 사용, 폐수 무방류기술을 구현하고 있다.

[원문보기]

Egypt's first ZLD plant is up and running

The first zero liquid discharge (ZLD) plant in Egypt, part of a water treatment facility designed and supplied by Aquatech, has been commissioned.

Installed at Egyptian Ethylene and Derivatives Company (Ethydco)'s petroleum derivates production facility at Alexandria, the system achieves zero liquid discharge, and reduces fresh water demand by 70 per cent, from 2,600 m3/h to 800 m3/h.

The plant is fed by the River Nile, and is designed to protect the river's water quality.

The feed of 1,119 m3/h is a composite mix of treated effluent, and River Nile water that fluctuates and has inconsistent chemistry. Aquatech studied three years of data to design a process that can operate at seven pre-defined scenarios, adapting to prevailing site conditions.

Ethydco produces ethylene and other petroleum derivatives as the site. The plant treats wastewater from the facility and cooling tower blowdown to get cooling tower makeup water and boiler feed water, and to achieve ZLD.

The solution integrates a combination of technologies and equipment configurations, including a micro-filtration solution, and High Efficiency Reverse Osmosis (HERO) technology that achieves more than 97 per cent recovery across membrane systems. This is followed by QUA Fractional Electrodeionization (FEDI), to produce high quality demineralised water; then a two-stage thermal system comprising a brine concentrator and crystalliser to achieve ZLD, and a sludge treatment system.

"We are an innovator in ZLD technologies, and a pioneer in hybrid ZLD. We have more than 160 ZLD installations on six continents. Our experience positions us uniquely to help customers in all segments of industry to achieve increasingly strict environmental goals," said Aquatech principal process engineer, Robert Sweetman.

Aditionally, Aquatech has installed seawater desalination systems and water reuse plants in Egypt.

[출처 = Desalination & Water Reuse / 2016년 12월 14일]