Treatment of sulfurous surface water using a water treatment plant with a capacity of 100 lps. They were looking to expand to 200 lps. When performing the analysis, it was noted that the plant operated at 70 lps. Due to fouling of reverse osmosis membranes by manganese and sulfides.
CHALLENGE
Low productivity was detected in the equipment, because the oxidation pretreatment process used caused the precipitation of sulfides and hardness, affecting membranes, consuming many chemicals for pH adjustment and the deterioration of filter media. In addition, we detected a large organic load, high hardness, high silica content, presence of iron, manganese and sulfides.
SOLUTION
It was proposed to change the type of process and operate the equipment without oxidizing the current, filter organics and metals with ultra filtration and remove salts from the water to improve quality by reverse osmosis. Ultra filtration serves as a preparation for reverse osmosis, which allows longer operating cycles without the need to wash the membranes as frequently.
With the new process, it was possible to improve the operation of the membrane equipment, remove the sulfur, reduce chemical consumption and simplify the process.
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