Process for treating wastewater generated in production of PBAT and PBS polyester biodegradable resins

Abstract

The invention discloses a process for treating production wastewater of PBAT (poly (butylene adipate-co-terephthalate)) and PBS (poly (butylene succinate)) polyester biodegradable resins. Comprising an adjusting unit, a composite adsorption filler adsorption unit, a low-carbon alcohol solvent preparation unit, a saturated resin low-carbon alcohol solvent cleaning regeneration unit, a loaded solvent distillation regeneration unit, a hydrolytic acidification unit, an anaerobic treatment unit, a biological contact oxidation treatment unit, a precipitation unit and a sludge treatment unit. The wastewater treatment process is simple in operation flow and high in treatment efficiency, large wastewater impact load can be received by adjusting operation cycle parameters, the effluent quality is good, COD and ammonia nitrogen in wastewater can be well removed, the effluent is colorless, an adsorption unit of the wastewater treatment process uses composite adsorption filler, the main component is macroporous adsorption resin, and the adsorption efficiency is high. Macromolecular organic matters can be selectively adsorbed, the biotoxicity and pollution of wastewater are reduced, and stable and normal operation of a subsequent biochemical section can be ensured.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment process for producing PBAT and PBS polyester biodegradable resins. Background technique [0002] Polyester biodegradable polymer materials have excellent biodegradability and are widely used. They can be used in packaging, agricultural films, tableware, cosmetic bottles and medicine bottles, disposable medical supplies, pesticide and fertilizer slow-release materials, biomedical In the field of polymer materials, polyester biodegradable resins can effectively reduce the impact of white pollution on the environment. The composition of wastewater generated in the production process is extremely complex. Pollutants in wastewater include esters, alcohols, ketones, furans , Benzene series and its degradation intermediates and oligomers have the characteristics of COD concentration as high as 10,000mg / l, complex components, large fluctuations, and ac...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of PBAT, PBS polyester biodegradable resin production wastewater treatment process, possess the advantage of non-polluting wastewater treatment, solve the current treatment method of polyester biodegradable resin production wastewater using "pretreatment + hydrolytic acidification + anaerobic + biological contact oxidation treatment + sedimentation tank” combined process, the pretreatment section mostly adopts chemical oxidation treatment, but the treatment effect is not ideal, and the effluent is black. In actual operation, this method will produce a large amount of black foam, causing The operating environment is poor, and the problem of defoaming needs to be considered. Adding chemicals such as acids, alkalis, and oxidants increases the salt content in the wastewater, which in turn increases the difficulty of treating wastewater from the production of polyester biodegradable resins, and cannot guarantee that the wastewater meets the discharge standards. question

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