System for waste water treatment by utilizing fluidized state partition iron powder

Abstract

The invention provides a system for waste water treatment by utilizing fluidized state partition iron powder. The system comprises a reactor, a separating device and an iron powder cleaning device. A mud scraping area, a preliminary reaction area, a primary enhanced reaction area, a secondary enhanced reaction area and a solid-liquid separation area which are communicated in sequence are arranged in the reactor from bottom to top. A water inlet of the mud scraping area is communicated with a waste water inlet pipe, the solid-liquid separation area is communicated with the separating device, the separating device is further communicated with a waste water outlet and an iron powder cleaning device through pipes respectively, and the iron powder cleaning device is further communicated with the secondary enhanced reaction area, a water outlet of the mud scraping area and the waste water inlet pipe through pipes respectively. According to the system, uniform mixing, precipitation and recycling integrated reaction separation of the iron powder and the waste water are implemented, shortcomings that an iron material fixed bed is easily subjected to passivation hardening and iron granules in a conventional micron iron treatment method are unevenly distributed and lost easily are overcome, and shortcomings that the cost of adopting nano-iron is too high and it is difficult to recycle the nano-iron are overcome.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a system for treating wastewater with fluidized state partitioned iron powder, in particular to a system and method for intensified treatment of wastewater with fluidized state partitioned iron powder. Background technique [0002] In recent years, due to the rapid development of mining, metallurgy, chemical industry, medicine and other industries, industrial wastewater has been discharged indiscriminately. This kind of wastewater has the characteristics of high toxicity, slow metabolism, easy accumulation, poor biodegradability, and irreversibility, which seriously pollutes surface water and groundwater. Lead to frequent industrial pollution incidents. [0003] As an environmentally friendly reducing agent, metallic iron has received more attention and application in water pollution control. The reaction is usually carried out at normal temperature and pressure, and ...

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Problems solved by technology

However, the application of nano-iron also has problems such as high cost and easy aging during preparation, transportation and application.

[0006] In order to overcome the disadvantages of iron material fixed bed and nanometer zero-valent iron, patent CN102795690 provides "a method for ultrasonically strengthening micron-scale iron-copper bimetallic particles to treat wastewater" , this method mainly uses ultrasound to make the iron-copper bimetallic particles in a fluidized state to improve the mass transfer efficiency of the reactor and solve the problems of easy hardening of the fixed bed and high cost of nano-zero-valent iron

But there are also many problems. Although this method realizes the fluidization of micron iron, the iron and copper particles are also easy to lose in the fluidized state, which greatly increases the consumption of iron and increases the processing cost; Cavitation corrosion affects its service life and treatment effect; ultrasonic technology has many limitations in large-scale engineering applications and is difficult to apply in engineering

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