Device for filtering sewage step by step and method for treating sewage by using device

Abstract

The invention provides a device for filtering sewage step by step. The device mainly comprises a biofilter, a nano aerated coagulation-micro-vortex flocculation device, a three-level backflushing and screening device, a nitrogen adsorption tank, a phosphorus adsorption tank and a photocatalytic degradation reaction device. The invention also discloses a method for treating sewage by utilizing the device. The device and the method have the beneficial effects that the pollutants difficult to degrade, such as residual polycyclic aromatic hydrocarbon compounds and residual heterocyclic compounds are degraded through deep oxidation and are sterilized, thus reducing the chroma of the effluent by more than 99%; the aromatic fulvic acid substances in the sewage treated by the device are reduced by more than 95%; the sewage turbidity is reduced by 99%; the effluent quality and transparency are high; the effluent quality is improved; The method is efficient and safe and is simple to operate; the treated sewage can be recycled for irrigating, flushing the toilets and washing the ground as recycled water.

Description

technical field [0001] The invention relates to a device for filtering sewage step by step, in particular to a process method for stripping pollutants in sewage layer by layer. [0002] The present invention also relates to a specific method for filtering sewage by using the above-mentioned device. Background technique [0003] With the acceleration of my country's economic development, the amount of sewage discharge has increased dramatically. The discharged sewage contains a large amount of solid particles, nitrogen and phosphorus, microorganisms and other pollutants. Direct discharge will inevitably pollute water sources and the environment, spread diseases, and endanger people's health. If the wastewater is treated and discharged up to standard, the environmental quality will be greatly improved. The organic matter in the sewage and a large number of proliferating bacteria consume a large amount of dissolved oxygen in the water, making the lake water anoxic and endange...

AI Technical Summary

Problems solved by technology

The organic matter in the sewage and a large number of proliferating bacteria consume a large amount of dissolved oxygen in the water, making the lake water anoxic and endangering the survival of aquatic organisms; and the lack of oxygen in the water leads to the death of microorganisms that need oxygen, and it is these aerobic microorganisms that can decompose Organic matter maintains the self-purification ability of rivers and streams, and the final result is: rivers and streams become black and smelly, and a large amount of toxins accumulate

The reason for this situation is that the sewage is not treated in time, resulting in the exhaustion of easily degradable organic matter inside, the sharp decrease in the biochemical properties of sewage, and the difficulty of treatment is becoming more and more difficult.

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