During the plastic granule processing, the raw materials are complex, generally including discarded water bottles, beverage bottles, plastic bags, and other waste plastic products. These are recycled and reutilized, crushed, and then cleaned with clear water, repeatedly, to remove residual mud, sand, bacteria, and other large suspended particles. Waste plastics primarily come into contact with or are packaged with dyes, pigments, and the like. pH Pollution: Waste plastics mainly come into contact with or are packaged with strong acidic or alkaline substances. Microbial Pollution: Waste plastics mainly originate from disposable items. Toxic Substances Pollution: Waste plastics mainly come into contact with or are packaged with toxic and harmful substances. The concentration of pollutants in the wastewater is closely related to the nature of the waste plastics used in production. The wastewater contains many items such as paper, soil particles, and is of various types of plastics, resulting in a large amount of wastewater, up to 10t/t of waste plastic, with high organic and suspended matter content from the cleaning and crushing processes.

Plastic Granule Washing Wastewater Treatment Equipment - Process Flow

The primary raw materials for recycled plastic granules are polyethylene terephthalate (PET) and polypropylene. In the process of recycling and utilizing waste plastics, a high-temperature alkaline washing technique is employed, consuming approximately 500 cubic meters of water per day for alkaline washing. Due to the long-term recycling of this alkaline wash water, a significant accumulation of organic matter occurs. Although 80% of the water is reused in production, some high-concentration alkaline wash wastewater is discharged. The wastewater treatment system is resilient against sudden changes in flow and load, as well as power outages. It operates with low running costs, consuming only one-eighth to one-third of the electricity used by other aeration wastewater treatment systems. It occupies only half the space of conventional activated sludge methods. With a diverse range of microorganisms growing within the biological system, it can efficiently treat various hard-to-degrade industrial wastewater. This novel design discharges the plastic washing wastewater into the internal chamber of a filter box via an advanced inlet pipe, where it is then stripped of large plastic debris through a filtering mesh. Additionally, large plastic debris on the top of the filter mesh is concentrated and processed by an automatic cleaning mechanism. This addresses the issue of low efficiency in existing plastic washing wastewater treatment equipment. The high-efficiency treatment equipment for plastic washing wastewater boasts high processing efficiency, reducing the time required for wastewater treatment, thereby increasing its efficiency.