Treating polyester wastewater is a multifaceted technical challenge that requires a variety of process methods to achieve effective purification. The following is a re-organization of key technologies and case studies on polyester wastewater treatment to ensure clarity and ease of understanding, while emphasizing the principles of each method:
Polyester wastewater treatment technology
High-temperature oxidation technology: The organic matter in the wastewater is completely oxidized by high-temperature incineration, converted into harmless gas and discharged. This technology is quick and easy to operate, but it is relatively expensive and is more suitable for treating small amounts of wastewater.
Organic Matter Recovery and Reuse: This technology physically or chemically separates valuable organic matter such as acetaldehyde and ethylene glycol from wastewater, which can be reused after treatment. This not only reduces disposal costs, but also enables the recycling of resources, but the process is more complex.
Integrated treatment process: Pretreatment is used to reduce chemical oxygen demand (COD), combined with biological treatment and further advanced treatment, to ensure that the final discharge wastewater COD concentration is less than 60mg/L, which meets environmental protection standards.
Case Study
Anaerobic biological treatment: A company uses anaerobic biological treatment to treat polyester chip wastewater, and then uses aerobic aeration to ensure that the water quality meets the discharge standards. This technical example demonstrates the efficiency and stability of anaerobic treatment in practical applications, with purification efficiencies of 70 to 80 percent.
Coagulation and UASB reactors: In Guangdong, a combination of coagulation, UASB (upflow anaerobic sludge bed) reactor, multi-stage contact oxidation and oxidation has been used to treat polyester resin wastewater. This case illustrates the combination of physicochemical and biological treatment technologies that can effectively treat polyester wastewater and meet discharge requirements.
Anaerobic biological treatment plays an all-rounder role in polyester wastewater treatment, using microorganisms to decompose organic matter in an oxygen-free environment, effectively reducing the chemical oxygen demand of wastewater, and converting it into biogas, where methane components can be used for energy recovery.
This method not only reduces the volume and waste generation of wastewater, but also reduces the cost of subsequent treatment, as the anaerobic treated wastewater is more prone to aerobic treatment or other physicochemical treatment. At the same time, the anaerobic digestion process has a certain transformation effect on refractory chemicals, improves their biodegradability, and increases the overall treatment efficiency of wastewater.
Due to the low operating and maintenance costs, as well as the adaptability to fluctuating conditions, this treatment method is highly cost-effective in the application of chemical wastewater and has become an indispensable part of chemical wastewater treatment due to its environmentally friendly properties.
Although in some cases it may be necessary to combine with other technologies to overcome issues such as slower treatment rates, anaerobic biological treatment remains one of the preferred technologies in chemical wastewater treatment.
Through the above case studies, we can see that polyester wastewater treatment is a complex process that requires a combination of multiple technologies. As technology advances, future treatment methods will become more efficient and at the same time more environmentally friendly.