Method and device for pretreatment of landfill leachate
A landfill leachate and pretreatment technology, applied in the treatment of polluted groundwater/leachate, infiltration/dialysis water/sewage treatment, sedimentation treatment, etc. The problem of high concentration of hydrogen sulfide can improve the quality of the influent water, change the low operating flux, and reduce pollution.
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Embodiment 1
[0038] On the basis of the above steps, hydrogen peroxide is added as a modifying agent in step S1, and the ORP potential in the landfill leachate is controlled by changing the dosage (volume ratio) of hydrogen peroxide to oxidize the sulfide in the landfill leachate, vulcanize H 2 S. During this process, milk of lime was added to control the pH value of step S2 at 9, and the results are shown in Table 1.
[0039] Table 1 Effect of ORP potential and modifier dosage on sulfide content
[0040]
[0041] In step S1, the ORP potential in step S1 is controlled by adding modifying agents to reduce the H in the landfill leachate 2 S is oxidized to elemental sulfur, which is beneficial to the subsequent coagulation and precipitation reactions. It can be seen from Table 1 that in a preferred embodiment, the ORP potential in step S1 is controlled at -50 to 150 mV, and the modifying agent can effectively remove H in landfill leachate under this ORP potential. 2 S, the most thorough ...
Embodiment 2
[0044] On the basis of the above steps, hydrogen peroxide is selected as the modifying agent in step S1, and the ORP potential is controlled at 0 mV.
[0045] Table 2 The effect of pH value on the stable flux of membrane treatment
[0046] ORP potential pH value Ultrafiltration Membrane Stabilized Flux (LMH) 0 8.5 60 0 9 78 0 9.5 80 0 10 80 0 10.5 82
[0047] In a preferred embodiment, after adding the coagulant in step S2, the pH value is adjusted to a range of 9-10. When the pH is within this range, it can effectively change the charging properties of organic colloids in water, and remove a large number of suspended colloids and COD. At the same time, ensure that the subsequent ultrafiltration membrane system has a high and stable flux, which is maintained at 78-80LMH. When the pH value is less than 9, the coagulation and sedimentation reaction of the suspended solid colloid is not complete, and the COD content of the landfil...
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