During the plastic granule processing, the raw materials are relatively complex, generally including discarded water bottles, beverage bottles, plastic bags, and other waste plastic products. After recycling and reusing, they are washed with clean water, repeatedly, to remove residual mud, sand, bacteria, and other large suspended particles. Waste plastics mainly come into contact with or are packaged with dyes, pigments, and other substances. 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 single-use items. Toxic Substance Pollution: Waste plastics mainly come into contact with or are packaged with toxic and harmful materials. The concentration of pollutants in the wastewater is closely related to the nature of the waste plastics used in production. It contains many items such as paper and soil particles, and is made from multiple types of plastics, resulting in a significant amount of wastewater, up to 10 tons per ton of waste plastic. The wastewater generated during the washing and crushing processes has high organic matter and suspended solids content.

Plastic Pellet Cleaning Waste Water Treatment Process

The main raw materials for recycled plastic granules are polyethylene terephthalate (PET) and polypropylene. During the recycling process, a high-temperature alkaline washing process is employed, using 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 still discharged. The wastewater treatment system is resilient to sudden changes in flow and load, as well as power outages. Its operating costs are low, only one-eighth to one-third of other aeration wastewater treatment systems' electricity consumption. The land area required is only half that of conventional activated sludge processes. The system can efficiently treat various hard-to-degrade industrial wastewater due to the diverse range of microorganisms grown in the biological system. This novel application discharges the plastic cleaning wastewater through the advanced influent pipe into the interior of a filtering box, then removes large plastic debris through a filter screen. Additionally, it uses an automatic cleaning mechanism to concentrate and treat large plastic debris at the top of the filter screen, addressing the low efficiency issue of existing plastic cleaning wastewater treatment equipment. This high-efficiency plastic cleaning wastewater treatment equipment boasts high processing efficiency, reducing the time required for wastewater treatment, thereby enhancing its overall efficiency.