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A treatment method and technology for heavy metals, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of technological progress, qualified water quality and high recycling rate
Active Publication Date: 2013-03-13
URUMQI DEAN DONGSHENG ENVIRONMENTAL PROTECTION EQUIP CO LTD
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However, sodium sulfide is highly toxic, and heavy metals to remove chelates must be used within a narrow pH range; Chinese patent application number is 201110039652.2 The ion exchange method is used for the treatment of wastewater containing heavy metal ions such as copper, nickel, and zinc, and its treatment capacity is small , high toxicity, and heavy metals with recovery value are feasible; but because ion exchange resins are expensive and regeneration requires operating costs, therefore, they are rarely used in general wastewater treatment
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Embodiment 1
[0025] Treatment pH=2.03, Cu 2+ =120mg / L, F - =3mg / L, Fe 3+ =1800mg / L metallurgical pickling wastewater;
[0026] take (with figure 1 ) Process of acidic heavy metal wastewater—pH adjustment tank—coagulation air flotation device—inclined plate settlement—continuous microfiltration device—effluent reuse;
[0027] The waste water passes through the grid well to remove large floating objects and mechanical impurities and enters the pH adjustment pool. The pH adjustment pool has a reserve of 150 cubic meters. It uses mechanical stirring to adjust the water quality and volume, and adjust the pH. The sewage uses liquid sodium hydroxide to control the pH. 8.5;
[0028] Before entering the coagulation air flotation tank, use a pipe mixer to add 25 mg / L of heavy metal capture agent; the air flotation tank adopts a vortex concave air flotation device, and add polysaccharide bioflocculant 2 mg / L to the air flotation tank, heavy metal ions, organic matter, suspended matter, etc. Form...
Embodiment 2
[0033] Treatment pH=1.68, SS=2579mg / L, Cu 2+ =500mg / L, Ni + =35mg / L, processing capacity=150m 3 / d smelting pickling wastewater;
[0034] a. Grille pH adjustment: Sewage passes through the grid well to remove large impurities and enters the pH adjustment tank. The alkali device automatically adds milk of lime or quicklime or sodium hydroxide or carbide slag to adjust the pH to 8;
[0035] b. Coagulation and air flotation treatment: add 40mg / L of heavy metal scavenger before the coagulation and air flotation tank, and add 2mg / L of biological flocculant before the air flotation tank; through vortex air flotation, remove organic matter, heavy metals and suspended solids;
[0036] c. Depth pretreatment: the air flotation effluent is settled by the inclined plate, and enters the continuous microfiltration device for filtration to remove suspended solids and colloids;
[0037] d. Disposal of sludge and scum: Concentrate the air scum through the sludge in the scum tank and the sed...
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Abstract
The invention provides a treatment method of acid heavy metal wastewater, comprising the following steps of: removing massive impurity of the wastewater by the means that the wastewater passes through grids, and adjusting the pH to 8-9; adding 20-80mg / L heavy metal collecting agent before entering a coagulating floatation tank, and adding 0.5-4.0mg / L biological flocculants before entering the floatation tank; removing organic matter, heavy metal and suspended solids by means of cavitation air floatation; subsiding the water discharged in an air floatation way by a wobble plate, and filtering in a continuous microfiltration device to remove suspended solids and colloid; concentrating air floatation slag by the sludge of a floatation slag tank and a sedimentation tank, putting 20-60mg / L cationic polyacrylamide, and recovering in a drying way; and adding 1320kg of deionized water, 400kg of sodium hydroxide and 380kg of polyethylenimine into the reaction kettle, controlling the temperature of the reaction kettle to be below 25 DEG C, slowly and dropwise adding 1008kg of carbon disulfide, and cooling to room temperature to obtain the heavy metal collecting agent of orange viscous liquid.
Description
technical field [0001] The invention relates to sewage treatment technology in the field of resources and environment, in particular to a systematic treatment process for acidic heavy metal wastewater and the preparation of a heavy metal scavenger. Background technique [0002] As early as the early 1950s, the pollution of heavy metals to the environment had attracted worldwide attention, especially the "Minamata disease" caused by Hg pollution in Japan and the "bone pain disease" caused by Cd pollution, as well as in Japan. After some European countries discovered the serious consequences of heavy metal pollution one after another, people have paid much attention to the research on heavy metal pollution and its prevention and control; Pollution sources are constantly emerging. Due to technical limitations, some wastewater cannot be effectively treated, causing serious pollution to the environment. Therefore, the status quo of heavy metal pollution is extremely severe. Due t...
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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F11/14C02F1/62
Inventor 马莉达徐志宗
Owner URUMQI DEAN DONGSHENG ENVIRONMENTAL PROTECTION EQUIP CO LTD
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