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Treatment method of organic industrial wastewater

A technology of industrial wastewater and treatment methods, applied in water/sewage treatment, water treatment parameter control, water/sludge/sewage treatment, etc., can solve problems such as increasing treatment costs, affecting use effects, increasing workload, etc. Achieve the effect of reducing treatment cost, improving treatment effect and solving iron-carbon hardening

Inactive Publication Date: 2017-07-18
苏文灿
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sixth, the current catalytic oxidation plus micro-electrolysis technology has poor effect, and there are many problems in practical application
The above-mentioned catalytic oxidation and micro-electrolysis generally have the following problems, which affect the use effect. First, the COD degradation of extremely difficult wastewater is poor, only 30-40%, especially for high-salt wastewater. The workload increases and the processing cost is increased. The third is that the micro-electrolytic iron and carbon are easy to harden, and the channeling phenomenon reduces the processing effect.

Method used

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  • Treatment method of organic industrial wastewater
  • Treatment method of organic industrial wastewater

Examples

Experimental program
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Embodiment 1

[0068] The sample was taken from a chemical company's nitric chloride wastewater. The measured COD value was 15000mg / L, BOD value was 458mg / L, pH value was 0.5, chromaticity was 12000, and SS was 2500mg / L.

[0069] A. Pretreatment: Soak cast iron scraps in 10% NaOH solution for 10 minutes to degrease and clean them, then soak them in 3% HCl solution for 30 minutes to remove the surface wax film and wash them for later use; soak activated carbon for 2 hours for later use;

[0070] B. Electrolysis: add a composite electrolyte containing 40% of the volume of wastewater in the electrolysis tower containing wastewater. The composite electrolyte is a combination of pretreated cast iron filings and activated carbon at a volume ratio of 1:1; supplemented by compressed air aeration React for 40 minutes, measure the pH value as 4.5, add 1‰H 2 o 2 Continue to react for 25 minutes, measure the pH value as 6, stop the reaction, put the waste water into the intermediate pool and add the se...

Embodiment 2

[0073] The sample was taken from the sulfadiazine wastewater of a pharmaceutical company. The measured COD value was 12000mg / L, BOD value was 340mg / L, pH value was 7, chromaticity was 2000, and SS was 1500mg / L.

[0074] A. Pretreatment: Soak cast iron chips in 8% NaOH solution for 8 minutes to degrease and clean them, then soak them in 2% HCl solution for 25 minutes to remove the surface waxy film and wash them for later use; soak activated carbon for 1 hour for later use;

[0075] B. Electrolysis: add a composite electrolyte containing 25% of the volume of wastewater in the electrolysis tower containing wastewater. The composite electrolyte is a combination of pretreated cast iron filings and activated carbon at a volume ratio of 0.5:1.5; supplemented by compressed air aeration React for 30 minutes, measure the pH value as 4, add 0.5‰H 2 o 2 Continue to react for 20 minutes, measure the pH value to be 6.5, stop the reaction, put the waste water into the intermediate pool and...

Embodiment 3

[0078] The sample was taken from nitrobenzene wastewater from a chemical company. The measured COD value was 9500mg / L, BOD value was 310mg / L, pH value was 6, chromaticity was 11000, and SS was 2100mg / L.

[0079] A. Pretreatment: Soak cast iron chips in 12% NaOH solution for 12 minutes to degrease and clean them, then soak them in 4% HCl solution for 35 minutes to remove the surface waxy film and wash them for later use; soak activated carbon for 3 hours for later use;

[0080] B. Electrolysis: Add a composite electrolyte containing 50% of the volume of wastewater in the electrolysis tower containing wastewater. The composite electrolyte is a combination of pretreated cast iron filings and activated carbon at a volume ratio of 0.8:1.2; supplemented by compressed air aeration React for 50 minutes, measure the pH value as 5, add 1.5‰H 2 o 2 Continue to react for 30 minutes, measure the pH value to 5.5, stop the reaction, put the waste water into the middle pool and add the sedim...

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Abstract

The invention discloses a treatment method of organic industrial wastewater. The treatment method comprises the steps of pre-treating, electrolyzing and carrying out catalytic oxidation, and specifically comprises the following steps: pre-treating casting iron dreg and active carbon for later use; adding the pre-treated casting iron dreg and active carbon into an electrolysis tower containing the wastewater; introducing compressed air and carrying out an aeration reaction for 30min-50min; adding H2O2 and continuing to react for 20min-30min; stopping reacting and putting the wastewater into an intermediate tank; adding a precipitation agent and precipitating for 8h-24h; carrying out catalytic oxidation: pumping the wastewater treated by step B into a reaction tank with a stirring function; adjusting the pH (Potential of Hydrogen) value to be 1 to 4 with acid; adding a catalyst which accounts for 0.07%-0.09% of the volume of the wastewater, the active carbon which accounts for 0-0.08% of the volume of the wastewater, a molecular sieve catalyst which accounts for 0.01%-0.03% of the volume of the wastewater and an oxidant which accounts for 0.20%-0.22% of the volume of the wastewater to react for 50min to 70min; adjusting the pH value to be 6 to 7 with an alkaline solution; adding the precipitation agent for precipitating. The treatment method of the organic industrial wastewater, disclosed by the invention, has the advantages that the degradation rate of extra-high-difficulty wastewater COD (Chemical Oxygen Demand) and chrominance is high, the sediment amount is reduced, the working amount of sludge dehydration and the treatment cost are reduced and the treatment effect is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for treating organic industrial wastewater with high COD and chroma degradation rates, reduced sediment amount, reduced sludge dehydration workload and treatment cost, and improved treatment effect. Background technique [0002] In recent years, with the rapid development of my country's industry, a large amount of organic industrial wastewater has been produced. This type of wastewater has the following characteristics: first, the composition is complex, and the molecular chain is strong, showing a divalent or trivalent molecular chain, which is difficult to biochemically degrade; is COD cr high, normal COD cr From more than 10,000 mg / L to hundreds of thousands of mg / L; third, high chroma, from thousands to tens of thousands of times; fourth, this type of wastewater is highly toxic and seriously harmful to the environment, and cannot be treated u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/463C02F101/30
CPCC02F1/46109C02F1/463C02F1/4672C02F2001/46133C02F2101/30C02F2209/08
Inventor 苏文灿
Owner 苏文灿
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