Method for efficiently and synergistically treating chemical industry high-concentration organic wastewater and sludge

Abstract

The invention discloses a method for efficiently and synergistically treating chemical industry high-concentration organic wastewater and sludge. The method comprises the following steps: (1) uniformly mixing high-concentration organic wastewater and industrial sludge, and supplementing a surfactant, an initiator and a metal salt; (2) carrying out microwave hydrothermal treatment on the mixed solution under the conditions that the temperature is 130-250 DEG C and the pressure is 2-10MPa, so that the carbon source in the high-concentration organic wastewater and the metal elements in the sludgeare subjected to an in-situ reaction to generate a composite hydrothermal carbon catalyst; (3) introducing an oxidizing agent, and carrying out catalytic wet oxidation on the mixed solution under a microwave condition; and (4) carrying out solid-liquid separation on the reaction solution obtained in the step (3), carrying out drying treatment on the solid phase so as to be used as a catalyst forrepeated utilizing, and carrying out secondary treatment on the liquid phase as required so as to be reused or carrying out biochemical treatment. According to the invention, the efficient and synergetic treatment and resource utilization of high-concentration organic wastewater and sludge can be realized.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a method for efficiently and cooperatively treating high-concentration chemical organic waste water and sludge. Background technique [0002] In the process of chemical production, due to the use of a large amount of organic solvents and complex organic synthesis reactions, chemical production wastewater often contains a large amount of organic substances, and its COD is usually above 2000mg / L, and some even reach tens of thousands or even dozens of 10,000, and its biodegradability is poor, BOD / COD<0.3, this kind of high-COD and refractory biodegradable high-concentration organic wastewater often cannot be solved by traditional biochemical treatment methods. [0003] The treatment methods of organic wastewater mainly include ozone, Fenton, photooxidation, dilution biochemical, incineration and other treatment methods. For example, the Chinese patent with publication number CN110563253A...

AI Technical Summary

Problems solved by technology

This method is prone to secondary pollution

[0005] However, physicochemical or biochemical sludge generally has a high water content and contains toxic and harmful substances. Generally, the sludge needs to be dried and disposed of as hazardous waste. However, self-drying by enterprises has high energy consumption, large investment, and secondary pollution. And other issues

At present, there is also a technology to incinerate sludge in a cement kiln for harmless disposal, but this treatment method requires the treatment unit to have special operating qualifications and procedures

At present, there are few sludge treatment methods, and ordinary drying treatment cannot meet the growing demand for sludge disposal

[0006] At present, high-concentration organic wastewater and industrial sludge are usually treated separately. The treatment process is cumbersome, and it is easy to cause secondary pollution. In addition, additional oxidants or catalysts need to be added in various treatment processes. The treatment cost is high and the treatment efficiency is low.