Reasons for PH reduction of water produced by reverse osmosis purified water equipment
The reason for the decrease of PH in the water produced by the reverse osmosis purified water coagulation sedimentation equipment starts with the raw water. Generally speaking, the PH value of most natural water is affected by the balance of carbonic acid, and each PH value corresponds to the concentration ratio of the chemical balance of carbonic acid in the water. Generally, tap water, well water, river water, spring water, etc. are used to feed the reverse osmosis purified water coagulation sedimentation equipment. The PH value of these water is generally within the range of 6-8, and only CO2 and HCO3 - are used in the water, The reverse osmosis coagulation sedimentation equipment can remove most HCO3 - and leave CO2. Compared with the reverse osmosis equipment inlet water, the concentration ratio of HCO3 - decreases, so the PH value decreases accordingly. The PH value of the primary RO permeate is usually in the range of 4.8-7. The experiment shows that the PH value of the secondary RO influent is about 8.3, and the conductivity of the permeate is low.