Method and device for treating high-concentration nonbiodegradable organic wastewater

Abstract

The invention discloses a method and device for treating high-concentration nonbiodegradable organic wastewater. The method comprises the following steps: (1) adjusting pH (Potential of Hydrogen) of the wastewater to be 3; (2) feeding the adjusted wastewater into an Fenton reactor, and simultaneously adding an Fenton agent to perform Fenton reaction; (3) enabling the wastewater containing the Fenton agent to flow through an electric flocculation device; continuously performing Fenton reaction under the effect of a pulsed power electric field, and simultaneously performing electrochemical reaction and electric catalytic oxidation reaction, in order to further degrade organic matters in the wastewater as well as generate flocculates and precipitates; scrapping the flocculates through a slag scraper in an air flotation area of the electric flocculation device; and (4) enabling the wastewater with the precipitates to flow into a precipitation tank, adjusting the pH to be 7 to 8, and then removing the precipitated wastewater from the precipitation tank. Compared with the prior art, the method for treating the high-concentration nonbiodegradable organic wastewater, disclosed by the invention, can improve the removal efficiency of nonbiodegradable organic pollutants.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a method and device for treating high-concentration refractory biodegradable organic waste water. Background technique [0002] In recent years, the rapid development of printing and dyeing, pharmaceutical, chemical and petroleum industries has produced a large amount of wastewater containing refractory organic pollutants, which has brought great harm to the ecological environment. This type of wastewater has the characteristics of high concentration, high chroma, strong toxicity, and good stability. The traditional biochemical treatment process has poor effect, and other physical and chemical methods have either poor treatment effect or high treatment cost. Therefore, the treatment of this type of wastewater Treatment has always been a recognized problem in domestic and foreign sewage treatment circles. For this reason, people have been unremittingly looking for new treatment processes ...

AI Technical Summary

Problems solved by technology

The Fenton oxidation method is one of the advanced oxidation technologies. Although it has a good effect on the treatment of refractory organic pollutants in water when used in the field of environmental pollutant treatment, it has the following shortcomings in practical application: 1) H 2 o 2 Low utilization rate, incomplete degradation of organic pollutants

2) The simple Fenton reaction must be carried out in an acidic medium with pH<3, and the extremely low acidity requirement increases the cost of water treatment

However, electrocoagulation has the following disadvantages: 1) Electrocoagulation technology largely depends on the chemical properties of aqueous solution, especially the conductivity, so some water quality needs to add electrolyte to improve conductivity

3) The plate is easy to form an oxide film and passivate, which affects the treatment efficiency of electrocoagulation

Images