Magnetic flocculation city rainwater treatment device and process thereof

Abstract

The invention discloses a magnetic flocculation city rainwater treatment device. The magnetic flocculation city rainwater treatment device comprises a rainwater collecting device, a medicine adding device, a coagulation reaction pool, a purification treatment device and a magnetic powder recovering device, and is characterized in that the rainwater collecting device is connected with the coagulation reaction pool through a water pipe; the medicine adding device is connected with the coagulation reaction pool through a water pipe; the coagulation reaction pool is connected with the purificationtreatment device through a water pipe; the purification treatment device is connected with the magnetic powder recovering device through a water pipe; the magnetic powder recovering device is connected with the coagulation reaction pool through a water pipe. The magnetic flocculation city rainwater treatment device has the following advantages: the starting speed is high, the hydraulic retentiontime of the system is short, the solid and liquid separation speed is high, and heavy metal in city rainwater as well as toxic and harmful organic matters conventional in a hardening road can be removed efficiently; the magnetic flocculation city rainwater treatment device is simple in sewage treatment, adopts mechanical dehydration, is small in medicament adding quantity, is convenient to operateand maintain, and does not have peculiar smell; the modified magnetic seeds used by the device can be recycled with high recovery efficiency; the cost of treating the city initial rainwater of the system is low; the occupied area is small.

Description

technical field [0001] The invention relates to the field of flocculation devices, in particular to a magnetic flocculation urban rainwater treatment device and a process thereof. Background technique [0002] Most of the existing rainwater drainage systems flow into the drainage pipes through the interception wells set on the ground, and then discharge into the receiving water body. With the increase of urban air pollution and ground pollution, rainwater scours the atmosphere and ground before flowing into wells, making water pollution more serious. In particular, the initial rainwater contains a lot of impurities and pollutants. The initial rainwater dissolves a large amount of acid gas in the air, industrial waste gas and other polluting gases during rainfall. Contains a large amount of oil, suspended solids, sediment, heavy metals, benzene compounds and other pollutants. Therefore, the pollution degree of the initial rainwater is relatively high. If the initial rainwat...

AI Technical Summary

Problems solved by technology

During the rainwater treatment process of the traditional flocculation and sedimentation device, the flocs produced by the traditional flocculation device settle slowly, which requires a long hydraulic retention time, and the rainwater accumulated in the city cannot be treated in time, and the work efficiency is extremely low; the traditional flocculation device has a low degree of integration. It occupies a large area and the rainwater treatment process is relatively complicated, which greatly increases the cost; in addition, the traditional flocculation device has poor treatment effect and cannot remove SS, TP, heavy metals, benzene compounds, petroleum substances and insoluble COD, BOD and other pollutants, the turbidity of the effluent is still very high; therefore, the present invention proposes a magnetic flocculation urban rainwater treatment device, which can well solve these problems. There is no special requirement for water quantity and quality, etc., it can bear a large load, has strong adaptability, high treatment efficiency, and can still run stably in the case of high water quantity or high pollution load; the start-up time of the present invention is fast, and the hydraulic retention time of the whole system Short (about 5-8 minutes), settling speed 20m / h-40m / h; the sludge treatment of the present invention is simple, adopts mechanical dehydration, less dosage of chemicals, simple operation and maintenance, no peculiar smell; modified magnetic species of the present invention Recyclable, high recovery rate, cost reduction; the invention has a small footprint and high system processing efficiency, and the same daily processing volume occupies only 1 / 15-1 / 30 of the traditional process

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