Environmentally-friendly treatment method and device for organic sewage

Abstract

The invention discloses an environmentally-friendly treatment method and an environmentally-friendly treatment device for organic sewage. The treatment method comprises the following steps of: electrode electro-catalysis oxidation: separating out OH ions from the sewage by an electrolysis method, wherein the OH ions oxidize and degrade organic oxides in the sewage into volatile CO2 and N2; precipitation: treating the sewage treated in the step 20 by a flocculation reaction method to flocculate the harmful substances in the sewage into floccus and further settle the floccus; and adsorption: adsorbing the sediment in the step 30 through fly ash, and drying the sediment to form an organic fertilizer.

Description

technical field [0001] The invention relates to an environment-friendly treatment method and device for organic sewage. Background technique [0002] Organic sewage, such as pig farming sewage (mainly from pig manure and feed residues brought out by flushing pig pens), urban domestic sewage, the following uses pig farming sewage as an example to illustrate the existing organic sewage treatment methods and existing technologies question. [0003] In the modern pig farming industry, instead of using artificial methods to pick up the pig manure before being washed, a large amount of water is used to flush the pig excrement out of the pig pen together, so as to greatly improve the sanitation and cleanliness of the pig house, and greatly Reduce the growth of various germs and achieve the large-scale development of intensive pig breeding. Because the flushing water is mixed with a high proportion of pig manure and urine, its chemical oxygen demand (COD), biological oxygen demand...

AI Technical Summary

Problems solved by technology

This treatment method has the following defects: 1. The treated water cannot be recycled, and direct discharge will pollute the environment; 2. Although the COD has been greatly reduced after biogas treatment, anaerobic bacteria degrade organic matter to produce biogas. , unable to decompose harmful substances such as ammonia nitrogen and total phosphorus in the sewage, so that the ammonia nitrogen content in the sewage is extremely high, and direct discharge will easily cause eutrophication of the river water, make the water body smelly due to algae breeding, and at the same time, the COD index will exceed the standard due to insufficient biogas reaction time

This treatment method has the following defects: 1. Practice has proved that this method has a large investment, high material consumption, and the cost of treating sewage reaches more than 20 yuan / ton, and it cannot reach the discharge standard; 2. The sewage has a long residence time in the treatment process. The capacity of the sewage tank is large, which is generally more than 30 times the amount of sewage discharged daily, which requires a large amount of investment and occupies a large amount of land, which brings a great burden to the pig industry; It is difficult to control, and the excess reaction method can only be used to treat the sewage with physical and chemical reactions. As a result, the accumulation of reaction additives continues to increase, requiring greater costs or troubles to deal with the residual liquid of additives, and the residue of reaction sediments is difficult to recycle. Utilization also brings damage to the ecology

Images