Method for jointly treating high-fluorine sewage by utilizing waste slag

Abstract

The invention provides a method for jointly treating high-fluorine sewage by utilizing waste slag, which comprises the following steps: (1) carbide slag, pulverized fuel ash and red mud are added into a treatment pond containing the high-fluorine sewage and sent into an overflow pond after being stirred and reacting for 10-20 minutes, and clear liquid in the overflow pond flows into a reaction pond; (2) the carbide slag is added into the reaction pond, and the pH is regulated to 9-10; after 10-20 minutes of reaction, a coagulating agent is added to the clear liquid, and the pH is regulated to 6-7.5; after 10-20 minutes of reaction, a coagulant aid is added to the clear liquid; and after 10-20 minutes of reaction, the clear liquid is filtered and drained. The method uses the industrial waste slag for treating the high-fluorine sewage so as to ensure that the fluorine content in the treated sewage conforms to an environmental protection standard specified by the nation, thus the pollution of the high-fluorine sewage to the environment is greatly reduced. Meanwhile, the harm of the industrial slag to the environment is also reduced, thus the method has higher economic benefit and social benefit.

Description

technical field [0001] The invention belongs to sewage treatment technology, and relates to a method for jointly treating high-fluorine sewage by utilizing waste residues. Background technique [0002] Fluorine is a trace element. Drinking water with a fluorine content of 0.4-0.6 mg / L is beneficial to humans, but drinking high-fluorine water with a fluorine content greater than 1.5 mg / L for a long time will have adverse effects on the human body. Severe cases can cause dental fluorosis and bone disease; the discharge of high-concentration fluorine-containing industrial wastewater will cause great pollution to the environment, poison animals and plants, affect animal husbandry and agricultural production, and even cause serious harm to human health. Therefore, the treatment of fluoride-containing sewage is of great significance. At present, there are many methods for treating fluorine-containing wastewater at home and abroad, mainly including adsorption method, electrocoagul...

AI Technical Summary

Problems solved by technology

The currently adopted method is lime precipitation method, but the cost of this method is high, which is not conducive to sustainable development

[0004] Calcium carbide is mainly used to prepare polyvinyl chloride, polyethylene and acetylene, but at the same time it will produce calcium carbide slag; red mud is the waste residue produced in the production process of alumina or aluminum hydroxide, and fly ash is mainly used in coal-fired thermal power plants Or waste discharged from thermal power plants, these industrial wastes only have about 20% of the waste to be reused, and most of them have not been used on a large scale. Most of the wastes are directly stacked in the open air after simple treatment. It will cause serious environmental pollution, endanger the growth of animals and plants, and even pollute water sources. How to make reasonable use of these industrial wastes has become a challenge today

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