Method for resource utilization of landfill leachate concentrated solution
A technology for landfill leachate and resource utilization, which is applied in chemical instruments and methods, contaminated groundwater/leachate treatment, and applications, and can solve the problems of high reaction conditions, difficult regeneration, and high treatment costs.
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Embodiment 1
[0036]Step 1. The membrane concentrate after the landfill leachate treatment is pumped into the delivery pipeline into the baffle tank and then into the reaction tank; caustic soda NaOH is added to the reaction tank to adjust the pH to 8-9, and large Some heavy metals include Cu, Cr, Ni and other elements, and the reaction residence time is about 1.5h;
[0037] Step 2, after the reaction is over, add 10mg / L of FeSO 4 and 2mg / L sodium polyacrylate, after stirring and reacting for 15 minutes, the suspension was transported to the sand filter tank by a circulating pump, and the heavy metal removal rate of the obtained product water could reach more than 95%;
[0038] The size range of the sand filter tank has a height-to-diameter ratio of 3:1; the diameter of the filled gravel is 1.0-4.0mm, arranged according to the particle size from small to large, the water inlet pressure of the sand filter is 2bar, and the work of the sand filter The pressure is 3bar;
[0039] Step 3. The l...
Embodiment 2
[0045] Step 1. The membrane concentrate after the landfill leachate treatment is pumped into the delivery pipeline into the baffle tank and then into the reaction tank; caustic soda NaOH and soda ash NaOH are added to the reaction tank 2 CO 3 , adjust the pH to 8-9, in this process can remove most of the heavy metals including Cu, Cr, Ni and other elements, the reaction residence time is about 1.5h;
[0046] Step 2, after the reaction is over, add 10mg / L of FeSO 4 , 2mg / L sodium polyacrylate and 5mg / L polyacrylamide, after stirring and reacting for 15 minutes, the suspension is transported to the sand filter tank by a circulation pump, and the heavy metal removal rate of the obtained product water can reach more than 95%;
[0047] The size range of the sand filter tank has a height-to-diameter ratio of 4:1; the diameter of the filled gravel is 2.5-4.0mm, arranged according to the particle size from small to large, the water inlet pressure of the sand filter is 1.5bar, and the...
Embodiment 3
[0054] Step 1. The membrane concentrate after the landfill leachate treatment is pumped into the delivery pipeline into the baffle tank and then into the reaction tank; add soda ash Na 2 CO 3 , adjust the pH to 8-9, in this process can remove most of the heavy metals including Cu, Cr, Ni and other elements, the reaction residence time is about 1.5h;
[0055] Step 2, after the reaction is over, add 10mg / L of FeSO 4 and 5mg / L polyacrylamide, after stirring and reacting for 15 minutes, the suspension was transported to the sand filter tank by a circulating pump, and the heavy metal removal rate of the obtained product water could reach more than 95%;
[0056] The size range of the sand filter tank has a height-to-diameter ratio of 3.5:1; the diameter range of the filled gravel is 2.0-4.0mm, arranged according to the particle size from small to large, the water inlet pressure of the sand filter is 1.5bar, and the sand filter The working pressure is 2.0bar;
[0057] Step 3. The ...
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