Combination process for advanced treatment on urban storm runoff

Abstract

The invention relates to a combination process for advanced treatment on urban storm runoff, which comprises rainwater treatment and backwashing sewage disposal, wherein the rainwater treatment comprises the following processes that: a pressurized water pump conveys rainwater collected in a rainwater raw water tank to a quartz sand filter, an activated carbon filter, a PP filter element and an ultrafiltration membrane component sequentially through pressurization, and the treated rainwater is stored in a water producing water tank; and the backwashing sewage disposal comprises the following processes that: when the quartz sand filter and the activated carbon filter are washed, a valve between the activated carbon filter and the PP filter element is closed, and the a sewage valve positioned at the top of the quartz sand filter and the activated carbon filter is opened; pressurized rainwater raw water passes through the quartz sand filter and the activated carbon filter sequentially at a high speed, and impurities absorbed on the surface of a filter material are washed by utilizing the impulsive force of high-pressure stream; and when an ultrafiltration membrane is subjected to backwashing, a solenoid valve I and a solenoid valve II are opened, a solenoid valve III is closed, a transfer pump conveys the water in the water producing water tank to the ultrafiltration membrane component, the water is pressed into an inner membrane of the ultrafiltration membrane from an outer membrane of the ultrafiltration membrane, and the water is discharged from a backwashing sewage disposal pipeline.

Description

technical field [0001] The invention relates to a combined process for advanced treatment of urban rainstorm runoff, in particular to a combined process for advanced treatment of urban rainstorm runoff and recycling of fresh water resources. It belongs to the field of environmental engineering and wastewater treatment engineering. Background technique [0002] With the economic development of our country, environmental problems are becoming more and more prominent, especially the lack of urban water resources and the pollution of water environment are becoming more and more serious. With the acceleration of urbanization, a series of water environment problems have arisen. On the one hand, the process of urbanization has increased the number of impermeable surfaces, and the flood disasters caused by urban storm runoff cannot be ignored. On the other hand, since most of the urban surface is impermeable, rainfall, especially heavy rain, quickly forms runoff after it hits the ...

AI Technical Summary

Problems solved by technology

Use the adsorption and self-purification ability of soil to treat rainwater to obtain better water quality, and it can be arranged under the green space of the community, so the operation feasibility is good. However, the composition of urban rainwater is very complicated, except for SS, BOD and other conventional In addition to pollutants, it also contains toxic pollutants such as pathogenic bacteria and heavy metals. With the progress of rainwater treatment, these toxic pollutants will be enriched in large quantities in the soil, causing soil pollution, and even polluting groundwater, while heavy metal pollution of soil and groundwater It is more difficult to manage

[0006] It can be seen that it is difficult to meet the water standards for municipal greening and other water use only with simple filtration, and segmental treatment according to the characteristics of rainwater quality changes is not operable. Self-purification ability (filtration, adsorption and microbial action) is easy to cause toxic and harmful substances to pollute soil and groundwater when treating rainwater

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