In the water quality pretreatment system, the activated carbon filter can absorb the residual chlorine that cannot be removed in the previous stage filtration to prevent the reverse osmosis membrane of the subsequent stage from being oxidatively degraded. Water odor, colloids, pigments, heavy metal ions, etc. have obvious adsorption and removal effects, and also have the effect of reducing COD. The SDI value of RO influent can be further reduced to ensure SDI<5 and TOC<2.0ppm.
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