Ship exhaust gas desulfurization wash water treatment process and treatment system based on sodium alkali method

Abstract

The invention discloses a ship exhaust gas desulfurization wash water treatment process based on a sodium alkali method. The process comprises steps of neutralization-oxidization-conditioning, air flotation-flotation selection solid and liquid separation, filtration purification and the like. The invention also discloses a ship exhaust gas desulfurization wash water treatment system based on the sodium alkali method. By the abovementioned processing steps, the process and the system can be used for implementing oxidization of sulfite in wash water, regulation of the pH value, flocculation and air flotation of particles and impurities and adsorption of fine-dispersed emulsified oil taken by the wash water so that the quality of the discharged ship wash water is ensured to satisfy the requirements of IMO on indexes such as emission pH, PAH, turbidity, temperature and the like of the wash water of a ship exhaust gas cleaning system.

Description

technical field [0001] The invention relates to waste water treatment, in particular to a sodium-alkali method-based ship waste gas desulfurization washing water treatment process and a treatment system thereof. Background technique [0002] The ship exhaust gas scrubbing and desulfurization technology is currently used to treat SO in the exhaust gas of marine diesel engines. X The main technology, the use of exhaust gas scrubbing and desulfurization technology will inevitably produce desulfurization washing water that needs to be treated. The International Maritime Organization (IMO) has also made strict regulations on the discharge standards of washing water for ship exhaust gas cleaning systems. Therefore, the treatment of ship desulfurization washing water has become The key to the ship's exhaust gas scrubbing system. [0003] Since the ship exhaust gas scrubbing and desulfurization technology is an emerging technology, domestic and foreign ship exhaust gas scrubbing an...

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Problems solved by technology

[0005] 1. The equipment used in the treatment process mainly includes oxidation fans, neutralization tanks, oxidation tanks, delivery pumps, air compressors, dissolved air tanks, air flotation tanks, etc., resulting in a large area of ​​the overall equipment and high energy consumption;

[0006] 2. The working conditions of the diesel engine are changing all the time, resulting in different concentrations of pollutants in the washing water that need to be treated under different working conditions. waste of

[0007] 3. The oil carried by the washing water is mainly finely dispersed emulsified oil. It is difficult to make the finely dispersed emulsified oil float naturally with the air bubbles through the flocculation-air flotation process, which may affect the quality of the effluent water

[0009] 1. The solid-liquid separation process in wastewater treatment is realized by the cyclone separator using the principle of centrifugal sedimentation. Because the flow of the fluid in the cyclone produces a certain shearing effect, it is easy to break up the flocculated solid particles, reduce the treatment effect, and deteriorate the separation process;

[0010] 2. The treated liquid is discharged after passing through the macroporous resin adsorption column, the efficiency of absorbing oil pollution is low, and it is not easy to regenerate

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