Fluorine-containing aromatic hydrocarbon wastewater treatment process

Abstract

The invention relates to the technical field of organic wastewater treatment, in particular to a fluorine-containing aromatic hydrocarbon wastewater treatment process. The treatment process is completed with an ion exchange resin tower with a filter screen convenient to automatically replace. The wastewater treatment process comprises the following steps: 1, pretreating resin; 2, carrying out acid washing and alkali washing treatment on the resin in the resin tower; 3, pretreating fluorine-containing aromatic hydrocarbon wastewater; and 4, pumping the pretreated wastewater into the resin tower through a waste liquid pump for adsorption treatment. The treatment work of the fluorine-containing aromatic hydrocarbon wastewater can be effectively completed, meanwhile, the speed of replacing a filter element can be greatly increased, and the situation that the wastewater treatment work needs to be stopped for a long time when the filter element is replaced is avoided, so that the treatment efficiency is improved to a certain extent, a cover body can be conveniently and quickly fixed on the tower body, the resin replacement efficiency is greatly improved, and the use by people is facilitated.

Description

technical field [0001] The technical field of organic wastewater treatment of the present invention, in particular, relates to a fluorine-containing aromatic hydrocarbon wastewater treatment process. Background technique [0002] 2-Chloro-6-fluorobenzyl chloride, 2-chloro-6-fluorobenzaldehyde and 2-chloro-6-fluorobenzoic acid are important organic chemical raw materials and key pharmaceutical intermediates, mainly through diazo, chlorination and hydrolysis and other routes of synthesis. A large amount of organic wastewater will be produced during the production process, and the main components of the wastewater are fluorine-containing aromatic hydrocarbons and phenolic substances. Both phenols and fluorine are protoplasmic poisons. Long-term drinking of water polluted by it will cause harm to the human body, and many national environmental protection departments have listed it as a priority control pollutant [0003] In recent years, as environmental issues have attracted...

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Problems solved by technology

[0003] In recent years, as environmental issues have attracted more and more attention, wastewater treatment has gradually become a factor restricting industrial development. In the process of industrial wastewater treatment, in the face of the above-mentioned organic pollution, traditional biochemical treatment methods are not suitable for ultra-high Concentration and biologically refractory wastewater treatment have corresponding deficiencies. The adsorption method is used to concentrate and reprocess the pollutants in the wastewater, which not only reduces the treatment cost but also improves the treatment efficiency. For the adsorption method to treat wastewater, there are mainly The problem is the degree of backwashing. When the synthetic resin is not yet mature, activated carbon is often used as the adsorbent in the adsorption process, and in-situ regeneration is basically not considered.

[0004] In the existing technology, the adsorption treatment of organic waste water by macroporous adsorption resin is mostly carried out by ion exchange resin tower, and the treatment of fluorine-containing aromatic hydrocarbon wastewater is also carried out by ion exchange resin tower, usually through precipitation. The pool pre-treats the fluorine-containing aromatic hydrocarbon wastewater to deal with most of the impurities contained in it, and then passes it into the ion exchange resin tower for resin adsorption. In order to improve the utilization rate of the resin and avoid the hardening of the resin, generally When the once-filtered wastewater is passed into the resin tower, it will be further filtered through the filter element installed in the resin tower, thereby effectively improving the utilization rate of the resin, while the traditional resin tower is welded at its inlet pipe. The flange plate, and then set the filter element in the flange plate to filter, so that when replacing the filter element, it is necessary to unscrew all the bolts on the flange plate, and then replace the filter element, which requires a long time Stopping the work of the resin tower greatly reduces the processing efficiency, and the tower cover and the tower body of the traditional resin tower are also connected by flanges, so when the resin is replaced, it is necessary to replace many parts on the flange. The resin can only be replaced after unscrewing the first bolt and taking out the tower cover, which greatly reduces the replacement efficiency.

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