A zero-discharge treatment process and device for coal chemical wastewater
A coal chemical wastewater and treatment process technology, applied in the field of water treatment, can solve the problems of calcium and magnesium reverse osmosis, low utilization of solid waste, scaling of evaporation devices, etc., and achieve the effects of reducing pollution, improving floating efficiency, and avoiding scaling
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Embodiment 1
[0089] In the first step, 0.05wt% rhamnolipid is added to the high-salt wastewater of the coal chemical industry, and then sent to electrocoagulation treatment. The electrodes in the electrocoagulation process are pure aluminum electrodes, the distance between the plates is 0.8cm, and the current density is 3.5A / m 2 , carry out the electrocoagulation reaction, the electrolysis time is 200s; the electrocoagulation sludge is sent to dehydration and incineration;
[0090] Step 2: Pre-adding acid to control the pH value of the water produced by electricity regulation flocculation is 4-6, and through aeration to make the dissolved oxygen of the wastewater 2mg / L, send it to the iron-carbon micro-electrolysis tower for oxidation treatment, and the iron-carbon The hydraulic retention time of wastewater in the micro-electrolysis tower is 1h; the iron-carbon micro-electrolysis filler is composed of iron filings and powdered activated carbon, and the weight ratio of iron filings to powder...
Embodiment 2
[0096] In the first step, 0.2wt% rhamnolipid is added to the high-salt wastewater of the coal chemical industry, and then sent to electrocoagulation treatment. The electrodes in the electrocoagulation process are pure aluminum electrodes, the distance between the plates is 1.2cm, and the current density is 5.5A / m 2 , carry out the electrocoagulation reaction, the electrolysis time is 350s; the electrocoagulation sludge is sent to dehydration and incineration;
[0097] Step 2: Pre-adding acid to control the pH value of the water produced by electric regulation and flocculation is 4 to 6, and through aeration to make the dissolved oxygen of the wastewater 3mg / L, and send it to the iron-carbon micro-electrolysis tower for oxidation treatment, and the iron-carbon The hydraulic retention time of wastewater in the micro-electrolysis tower is 2.5h; the iron-carbon micro-electrolysis filler is composed of iron filings and powdered activated carbon, and the weight ratio of iron filing...
Embodiment 3
[0103] In the first step, 0.1wt% rhamnolipid is added to the high-salt wastewater of the coal chemical industry, and then sent to electrocoagulation treatment. The electrodes in the electrocoagulation process are pure aluminum electrodes, the distance between the plates is 1.0m, and the current density is 4.0A / m 2 , carry out the electrocoagulation reaction, the electrolysis time is 200-350s; the electrocoagulation sludge is sent to dehydration and incineration;
[0104] Step 2: Pre-adding acid to control the pH value of the water produced by electricity regulation flocculation is 4-6, and through aeration to make the dissolved oxygen of the wastewater 2mg / L, send it to the iron-carbon micro-electrolysis tower for oxidation treatment, and the iron-carbon The hydraulic retention time of wastewater in the micro-electrolysis tower is 2 hours; the iron-carbon micro-electrolysis filler is composed of iron filings and powdered activated carbon, and the weight ratio of iron filings ...
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