Process for treatment of waste water containing boron
A treatment method and wastewater technology, applied in the direction of oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of low efficiency, difficulty in eliminating scaling and SS, and regeneration Problems such as large amount of waste liquid
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Embodiment 1
[0050] This embodiment takes the boron content of flowing water (B in ) 1262mg / l power plant wastewater for testing, using such as figure 1 The method of the present invention shown to add H 2 o 2 and Ca(OH) 2 The oxidation / flocculation mode of the flocculant was tested, and the pH value was controlled at about pH=10. The experimental results are shown in Table 1. H in the first oxidation / flocculation tank in Table 1 2 o 2 and Ca(OH) 2 Dosing amount is 5g / l and 14.2g / l respectively, to the removal rate of B (B rem ) up to 87.9%, compared with Comparative Example 1, confirms that the present invention adds H 2 o 2 The step of the method overcomes the bottleneck of the boron removal rate of the traditional flocculation method, so that the boron content of the treated water (B out ) down to 153mg / l.
[0051] Send the effluent water of the first oxidation / flocculation tank to a first solid / liquid separation tank and add anionic polymer flocculant (purchased from British ...
Embodiment 2
[0055] The present embodiment takes the power plant wastewater with a boron content of 1262mg / l in the flowing water for testing, and utilizes the method of the present invention to add different H 2 o 2 The oxidation / flocculation mode of the dosage was tested, and the H 2 o 2 The dosage range is between 1 and 10g / l, and the pH value is controlled at about pH=10. The experimental results are as follows: image 3 shown. Depend on image 3 It can be seen that the removal rate of boron increases with the addition of H 2 o 2 The increase of dosage increases, when H 2 o 2 When the dosing amount reaches about 7g / l, the curve tends to be horizontal. At this time, the boron content in the treated water is about 142mg / l, and the boron removal rate can reach 88.8%.
Embodiment 3
[0057] In this example, the treated water of the oxidation / flocculation tank was used as the inflow water, and the test of ion exchange resin treatment B was carried out. The ion exchange resin was purchased from the Amberlite series of ion exchange resins from Rohm&Haas in the United States, code-named IRA-743. The boron content in the influent water of the resin was 12.7 mg / l, and the operating influent flow rate of the ion exchange resin was controlled at 10 resin volume / hour (BV / h), the hydraulic retention time is about 6 minutes, and the pH value is controlled at about pH=10-11. Experimental results such as Figure 4 as shown, Figure 4 It shows that when the volume of the influent water is below 200 BV, the concentration of boron B in the effluent water is very low, almost undetectable. As the operating volume continues to increase, the boron B concentration in the treated water increases gradually, but it is still below the standard of B=1mg / l. When it reaches more th...
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