Water treatment process
A water treatment and process technology, applied in seawater treatment, water/sewage treatment, mining wastewater treatment, etc.
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example 1
[0082] An aqueous solution containing metal ions containing at least one of calcium, barium or strontium and other salts, including magnesium and sodium salts, is sent to step (a). In step (a), a cation exchange operation is performed with the recycled sorbent from step (c) in such a way that a small proportion of magnesium is adsorbed from the feedwater compared to the proportion of calcium adsorbed.
[0083] In this case, little or no sodium will be adsorbed from the feedwater (when the water treatment process is operating at steady state, with the adsorbent cycling between steps (a) and (c), during ) will desorb sodium), the ratio of magnesium to calcium and sodium to magnesium in the water entering the concentration step will be much higher than that in the feed water.
[0084] The concentrate returned to the ion exchange as a desorbent will have an increased ratio of magnesium to calcium, as well as an increased ratio of sodium to calcium, so that its composition will be ...
example 2
[0093] In Example 2 of the process of the present invention, the feed water contains sodium salts and at least one salt and anions of calcium-containing water subcomponents, especially including carbonates and bicarbonates, which will react with other components when concentrated. Components combine to produce deposits, colloids or scale. The magnesium content is lower than the calcium content (eg, on an atomic basis, the magnesium content is between zero and half the calcium content).
[0094] Cation exchange is used for the almost complete removal of calcium-containing water subcomponents from feedwater that has been treated for iron removal as required—for example—by oxidation and sedimentation. The solution depleted of ionic species produced during this cation exchange can then optionally be acidified for alkalinity adjustment before entering concentration step (b) (this may include continuous thin film or evaporative concentration or a combination of both) several stages...
example 3
[0097]Have saline groundwater with the composition listed in Table 1 to flow through the exchange column of 52mm diameter under the environment above room temperature with 12L / hour flow rate, described exchange column is housed 2L (humidification basis) strong acid cation exchange resin, and the initial characteristic of this resin is as follows Listed in Table 2, these properties have been first equilibrated by exposure to a bulk solution having the composition listed in Table 3 as a pretreatment to remove hydronium ions from the resin.
[0098] Alternatively, the same exchange column was filled with the same amount of this resin and brought into contact with 1.0 L / h of desorbent (synthetic concentrate) during the desorption stage operating at room temperature by upward transfer with Table 4 Ingredients listed.
[0099] At 30 minute intervals, 200 mL aliquots of resin were drawn from the bottom of the adsorption exchange column, drained, and added to the top of the desorptio...
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