A catalyst flue gas washing wastewater resource treatment method and system
A treatment method and catalyst technology, applied in the field of water treatment, can solve problems such as high cost and complex components, and achieve the effects of rapid and thorough removal, low operating cost, and significant economic and environmental benefits.
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Embodiment 1
[0037] In this example, the actual waste water (referred to as raw water) for flue gas washing of a certain catalyst is treated. The quality of the raw water is shown in Table 1. The treatment method is as follows:
[0038] 1. Restoration
[0039] Send the raw water to the closed reactor, add sulfuric acid solution into the reactor, adjust the pH value of the raw water to 4, and add the reducing agent sodium sulfite to carry out the reduction reaction at the same time, the amount of sodium sulfite added is twice the theoretical value, and the reaction temperature is 25 °C , and the reaction time was 45 minutes.
[0040] 2. Alkali treatment
[0041] Send the effluent of the above reduction reaction to a closed base adjustment system, add lime milk with a mass concentration of 3% to the base adjustment system, adjust the pH value of the reduction reaction effluent to 12, and react for 30 minutes.
[0042] 3. Decalcification, flocculation and precipitation
[0043] Send the ef...
Embodiment 2
[0054] In this embodiment, except that the oxidation treatment steps are different, all the other are basically the same as in Example 1, and the oxidation treatment steps in the present embodiment are as follows:
[0055] Send the effluent from the membrane absorption treatment to the closed oxidation system, at a molar ratio of CN - : ClO - :H 2 o 2 Sodium hypochlorite and hydrogen peroxide were added in an amount of 1:2:1.2 for oxidation treatment. The oxidation treatment time was 30 minutes. After the oxidation treatment, the pH value was adjusted back to 7 to obtain treated effluent.
[0056] The results show that: after being treated by the method of this embodiment, the heavy metals, cyanide, fluoride, ammonia nitrogen, etc. in the waste water all reach the national first-class discharge standard, the cyanide content is 0.1mg / L, and the inorganic fluoride content is 4mg / L , In addition, chromium, Hg, Pb, As, etc. are not detected, the quality of the treated water is ...
Embodiment 3
[0058] In this example, the actual waste water (referred to as raw water) for flue gas washing of a certain catalyst is treated. The quality of the raw water is shown in Table 2. The treatment method is as follows:
[0059] 1. Restoration
[0060] Send the raw water to the closed reactor, add sulfuric acid solution into the reactor, adjust the pH value of the raw water to 3, and add the reducing agent sodium sulfite to carry out the reduction reaction at the same time, the amount of sodium sulfite added is twice the theoretical value, and the reaction temperature is 25 °C , and the reaction time was 45 minutes.
[0061] 2. Alkali treatment
[0062] Send the effluent of the above reduction reaction to the closed alkali adjustment system, first add milk of lime with a mass content of 3% to the alkali adjustment system, the amount of lime milk added is 10000mg / L, and then add mass The content is 10% sodium hydroxide solution, the pH value of the water from the reduction reactio...
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