Coagulant used for advanced treatment of biochemical effluent of coking wastewater

A biochemical effluent, advanced treatment technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of general COD removal effect, unstable treatment effect, difficult to meet the terminal effluent standards, etc. Performance, the effect of large and dense flocs

Active Publication Date: 2014-04-30
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, coking plants mostly use a single polyferric sulfate as a coagulant to further remove COD and chroma in the sublimation effluent, but the amount is very large, generally 300-500ppm, or even as high as 800-1200ppm, and the COD The removal effect of , chroma, etc. is average, and the terminal water is often difficult to meet the standard
In recent years, some new advanced treatment coagulants or coagulants containing oxidants have also been used for the advanced treatment of coking biochemical effluent, but there are common problems such as high concentration and unstable treatment effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of the coagulant for the advanced treatment of biochemical effluent of coking wastewater: Weigh 100g of diatomaceous earth, add 1000mL of 0.25mol / L sulfuric acid, raise the temperature to 70°C, stir at a speed of 100r / min for 3h, and let it stand for cooling Return to room temperature, filter, wash the filter cake with distilled water until the pH value of the washing water is greater than 4, place the filter cake in a drying oven at 110° C. to dry to obtain modified diatomite. Weigh 20g of modified diatomite, 5g of polyaluminum chloride, 60g of solid polyferric sulfate and 15g of polysilicon ferric sulfate, and mix thoroughly to obtain 100g of flocculation adsorbent; then weigh 1% dicyandiamide-formaldehyde polymer auxiliary 20g of coagulant, and flocculation adsorbent to form coking wastewater advanced treatment flocculant.

[0015] Application of this implementation: Waste water samples are taken from a steel plant, and coking wastewater enters the second...

Embodiment 2

[0017] Preparation of the coagulant used for the advanced treatment of biochemical effluent of coking wastewater: Weigh 100g of diatomaceous earth, add 1000mL of 0.5mol / L sulfuric acid, raise the temperature to 80°C, stir at 100 r / min for 2 hours, and let it stand for cooling Return to room temperature, filter, wash the filter cake with distilled water until the pH value of the washing water is greater than 4, place the filter cake in a drying oven at 110° C. to dry to obtain modified diatomite. Weigh 15g of modified diatomite, 10g of polyaluminum chloride, 50g of solid polyferric sulfate and 25g of polysilicon ferric sulfate, and mix thoroughly to obtain 100g of flocculation adsorbent; then weigh 1% dicyandiamide-formaldehyde polymer auxiliary 25g of coagulant, and flocculation adsorbent to form coking wastewater advanced treatment flocculant.

[0018] Application of this implementation: Waste water samples are taken from a steel plant, and coking wastewater enters the second...

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Abstract

The invention relates to a water purifier, and provides a coagulant used for advanced treatment of biochemical effluent of coking wastewater. The coagulant is composed of a condensed adsorbent and a coagulant aid, wherein the condensed adsorbent comprises the following components of, by weight, 5-20% of polyaluminum chloride, 30-60% of solid polymer ferric sulfate, 10-40% of polyferric silicate sulphate, and 10-40% of modified diatomite; and the coagulant aid consists of a 1% dicyandiamide-formaldehyde polymer solution. The coagulant has a double effect of coagulation and adsorption, can effectively remove COD, colourity and the like of the biochemical effluent, makes the effluent stably reaching to the national first class discharge standard, is small in consumption, and reduces the cost for the advanced treatment of the coking wastewater.

Description

technical field [0001] The invention relates to a water purifying agent, in particular to a coagulant used for advanced treatment of biochemical effluent of coking wastewater. Background technique [0002] The pollutants of coking phenol cyanide wastewater are generally composed of ammonia nitrogen, cyanide, sulfide, thiocyanate, phenolic compounds, polycyclic aromatic compounds, and heterocyclic organic compounds containing nitrogen, oxygen, and sulfur. Ammonia nitrogen, phenols and oils are high in concentration, and there are many toxic and inhibitory substances. It is difficult to completely degrade organic pollutants in the process of biochemical treatment, which constitutes serious pollution to the environment. It is a typical high concentration, high pollution, toxic and difficult to degrade of industrial organic wastewater. [0003] The biological treatment method with carbon and nitrogen cycle as the core can effectively remove all pollutant indicators of coking wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 孙宝东盛建文唐永明徐兴福韩晓玲李剑
Owner NANJING IRON & STEEL CO LTD
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