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Manufacturing Technology Insights | Saturday, September 03, 2022
Paper recycling is the method of reusing discarded paper to get high-quality fiber for producing new paper and paper goods.
Fremont, CA: The industry of recycled paper has a long history. Early waste paper recycling industries did not prioritize environmental protection, resulting in significant contamination. It was a typical representative of the sunset industry, which all governments abolished. However, with the advancement of human science and technology, the technology addressed the pollution problems of wastewater treatment and deinking in the process of paper recycling, and cleaning production gets now achieved. As a result, the recycled paper sector is now known as the "urban forest" industry.
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If the recycled paper sector does not actively adopt sophisticated technology and equipment, it will significantly negatively influence the environment. The negative environmental effect of the recycled paper business gets expressed in the following two aspects:
Wastewater treatment
The wastewater generated by the paper industry gets marked by a variety of organic contaminants in huge quantities. The wastewater generated during the pulping and papermaking processes has complicated physical characteristics and various organic pollutants, making it one of the most challenging industrial wastewater to handle. The primary contaminants in wastewater from the paper industry include solid, soluble, colloidal, and so on.
Wastewater contains four major pollutants: SS, CODCr, BOD5, and chromaticity. CODCr and BOD5 in wastewater get primarily derived from lignin and hemicellulose. Small fibers, inorganic fillers, and other materials can help create SS. If the recycled paper sector does not treat properly, it can generate major environmental concerns.
The soluble and colloid pollutants are challenging to handle in recycled paper pulping wastewater treatment. Their contents include dissolved organic acid, organic and inorganic salt, carbohydrate, soluble lignin content, printing ink, chemical additives, soluble elements, distributed tiny form stable colloidal contaminants in wastewater, and so on. In addition, with the fast expansion of the papermaking sector, more and more wastewater is created in the papermaking process, putting additional strain on the environment. Therefore, paper wastewater treatment will be necessary for long-term growth.
Deinking and bleaching
The discarded paper must be deinked & bleached before it can get recycled. The paper industry's deinking section will generate many chemical pollutants. The bleaching section often uses chlorine bleaching. As a result, bleaching wastewater has a high concentration of chlorinated organic molecules. It is challenging to deal with hazardous chlorine phenol, fatty acid chloride, chloride resin acid, and other chlorinated organic compounds. They are also potent toxins that can induce many cranial nerve lesions.
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