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Method for treating town domestic wastewater by modified coal ash and flocculating agent

A technology for domestic sewage and fly ash, applied in the fields of flocculation/sedimentation water/sewage treatment, magnetic field/electric field water/sewage treatment, etc., can solve the problems of affecting the treatment effect, affecting the treatment efficiency, and difficult to form large flocs, etc. To achieve the effect of improving purification effect, improving treatment efficiency and improving utilization rate

Inactive Publication Date: 2008-03-05
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method and flocculant for treating urban domestic sewage with modified fly ash, so as to solve three problems in the traditional method: 1. The treatment cost is high and it is not easy to popularize; 2. It is difficult to form large sewage with low concentration Flocs directly affect the treatment effect; 3. The solid-liquid separation technology is immature, that is, the separation speed of flocs and water is slow, which seriously affects the treatment efficiency

Method used

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Embodiment Construction

[0026] 1-3mL of hydrochloric acid and 3-4g of fly ash are mixed and reacted to prepare the modified fly ash. Add 40-70mg / L modified fly ash into the urban domestic sewage reaction tank, stir at normal speed for about 1min, and let it stand until the flocs appear obviously. Then add 30-60 mg / L magnetic powder into the reaction tank, and stir at normal speed for about 1 min. Finally, the flocs were separated rapidly under the action of an external magnetic field. After treatment, the COD removal rate is about 70%, the turbidity is reduced by more than 90%, the total nitrogen is removed by 50%, and the total phosphorus is removed by 85%.

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Abstract

The present invention discloses method and flocculant for treating city domestic sewage with modified fly ash. Acid modified fly ash is applied in flocculating impurity in city domestic sewage, adsorbing nitride and phosphate, and enriching impurity magnetically under the action of outer magnetic field, so as to reduce the organic matter concentration in sewage effectively. Fly ash has low cost, certain adsorption capacity, wide source, stable performance and easy recovering.

Description

technical field [0001] The invention belongs to a sewage treatment method and a flocculant. Background technique [0002] For a long time, people have always believed that water is an "inexhaustible and inexhaustible" resource. However, the facts in the past half century show that with the continuous expansion and intensity of human use of water resources, the demand for water has greatly exceeded the output of water resources in many countries and regions, and water resource crises have frequently come to an end ! Even in those countries and regions with relatively rich water resources, the problem of lack of water quality-based water resources has also appeared due to the pollution of water resources while developing and utilizing water. my country is the most populous country in the world. With the rapid increase of the urban population, the urbanization of the countryside and the improvement of people's living standards, the per capita water demand and total water dema...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/48
Inventor 柳丹蔡冬清王相勤余增亮吴跃进李军
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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