(EnergyAsia, May 22, Tuesday) — Singapore-based water treatment specialist Hyflux said it has signed a shareholders’ agreement with Saudi Economic Development Company (SEDCO) and Lube Oil Re-refining Company (LUBREC) to jointly invest S$45 million to build and own a 6,000-tonne per year used-oil recycling plant in Jeddah, Saudi Arabia. (US$1=S$1.5).   The agreement was signed…