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| Application of Innovative Three-stage Filtration and Graded Reuse Technology for White Water in Coated White Cardboard Machine |
| Received:June 11, 2025 Revised:August 03, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.01.011 |
| Key Words:white water recycling three-stage filtration equipment principle freshwater consumption reduction |
| Author Name | Affiliation | Postcode | | DAI Yang* | Guangdong Guanhao High-tech Co., Ltd., Zhanjiang, Guangdong Province, 524000 | 524000 | | CHEN Jianyun* | Guangdong Guanhao High-tech Co., Ltd., Zhanjiang, Guangdong Province, 524000 | 524000 | | YANG Mingfan | Guangdong Guanhao High-tech Co., Ltd., Zhanjiang, Guangdong Province, 524000 | 524000 | | GAO Li | Kadant Johnson （Wuxi） Technology Co., Ltd., Wuxi, Jiangsu Province, 214000 | 214000 | | CAO Zhongyu | Guangdong Guanhao High-tech Co., Ltd., Zhanjiang, Guangdong Province, 524000 | 524000 | | TANG Yunhai | Guangdong Guanhao High-tech Co., Ltd., Zhanjiang, Guangdong Province, 524000 | 524000 |
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| Abstract:The paper introduced a new water-saving process for the white water circulation system of a 300 000 t/year white cardboard machine at the company, the white water circulation system of this paper machine adopted a three-stage filtration method. It successively utilized a multi-disc filter, a filter, and a fine filter with 15 discs to treat the white water. The final filtrate obtained had an suspended solids(SS) content of ≤10 mg/L and could partially replace fresh water. It was used for high-pressure spraying in the press section of the paper machine and for the secondary dilution of wet-end chemicals. This process saved 2 976 m³ of fresh water per day and achieved a fresh water reduction of 3.27 m³ per ton of paper produced. However, the continuous reuse of white water also led to the continuous accumulation of anionic trash (DCS) in the BM4 wet-end system, which interfered with the retention and drainage aid system. As a result, the performance of retention and drainage aids gradually deteriorated, leading to a gradual decrease in the first-pass retention rate of the three-layer headbox, as well as a gradual increase in the turbidity and conductivity of the white water from all three layers. |
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