Built-in micro-interface papermaking wastewater treatment system and method

Abstract

The invention provides a built-in micro-interface papermaking wastewater treatment system and method. The treatment system comprises a papermaking wastewater tank, a bar screen machine, an adjusting tank, a centrifugal filter and a sedimentation tank which are connected in sequence, and further comprises a heat exchanger, a preheater, a wet oxidation reactor, a gas-liquid separator and a biodegradation tank, wherein a micro-interface unit used for dispersing broken gas into bubbles is arranged in the wet oxidation reactor, the micro-interface unit comprises a pneumatic micro-interface generator, a gas inlet is formed in the side wall of the wet oxidation reactor, and the gas inlet extends into the pneumatic micro-interface generator through a pipeline. According to the treatment system, the micro-interface unit is arranged in the wet oxidation reactor, so the temperature and the pressure of the papermaking wastewater treatment system are reduced, the consumption of air or oxygen is reduced, and the effects of low energy consumption and high treatment efficiency are achieved.

Description

technical field [0001] The invention belongs to the technical field of papermaking wastewater treatment, and in particular relates to a built-in micro-interface papermaking wastewater treatment system and a treatment method. Background technique [0002] The paper industry is a traditional large water user and one of the important sources of water pollution. The discharge of industrial papermaking wastewater in my country ranks first among all types of industrial discharges. The papermaking industry pollutes the water environment the most seriously. The primary issue of prevention and control is also the primary issue of standard treatment of industrial wastewater in my country. [0003] The chemical composition contained in papermaking wastewater is relatively complex, and the temperature of the wastewater is relatively high. For this reason, the industry adopts a combination of physical, chemical, and biochemical methods for wastewater treatment. The current wet oxidation t...

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Problems solved by technology

[0003] The chemical composition contained in papermaking wastewater is relatively complex, and the temperature of the wastewater is relatively high. For this reason, the industry adopts a combination of physical, chemical, and biochemical methods for wastewater treatment. The current wet oxidation technology has strong adaptability and effective treatment. It has good advantages, and it is more successful to treat papermaking wastewater by combining with other processes, but the wet oxidation method requires higher reaction temperature, pressure and longer residence time. The reason is that the residence time of air or oxygen in the liquid phase Short, insufficient mass transfer time, large bubble diameter, small gas-liquid phase boundary area formed in the reactor, and insufficient mass transfer space, resulting in long reaction time, high energy consumption, and low reaction efficiency

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