Water production method
A technology for making water and washing water, which is applied in chemical instruments and methods, water/sewage treatment, water treatment parameter control, etc. It can solve the problems of decreased filterability, increased differential pressure, limited time, etc., and achieves the reduction of reagents or rinse water , The effect of suppressing the increase of differential pressure and the reduction of removal performance
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Embodiment 1
[0100] The sewer water secondary treatment water is used as the treated water, using figure 1 The apparatus shown in the flow diagram shown performs water production. In the first pH adjusting device 10, the pH of the pretreatment water is adjusted to 5.0 using sulfuric acid, and in the cationic flocculant injection device 20, polyaluminum chloride (hereinafter referred to as PAC) is injected into the water supply pipe 50 as a cationic flocculant. Make the concentration of PAC in the pretreatment water reach 50mg / L. Mix the PAC using an in-line mixer. The pre-treated water is membrane-filtered by the separation membrane module 30 as membrane-filtered water, and the membrane-filtered water is stored in the membrane-filtration water tank 40 provided at the rear stage of the separation membrane module 30 . The membrane filtration water tank 40 is equipped with a second pH adjustment device 11, injecting sodium hydroxide to make the pH of the membrane filtration water tank 40 6....
Embodiment 2
[0107] Except that the pH of the washing water was adjusted to 7.0, continuous operation was carried out under the same conditions as the method described in Example 1, and the ΔA value and its elevation, ΔB value, and the pH inside the separation membrane module after the water supply process and the removal target were measured. The removal rate of components, the results are shown in Table 1.
Embodiment 3
[0109] Except that the pH of the washing water was adjusted to 8.0, continuous operation was carried out under the same conditions as the method described in Example 1, and the ΔA value and its elevation, ΔB value, and the pH inside the separation membrane module after the water supply process and the removal target were measured. The removal rate of components, the results are shown in Table 1.
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