Eagle Ridge Paper views efficiency in our use of energy and raw materials as an important part of our responsibility to conserve natural resources. Our mill suppliers have achieved a steady rate of decrease in annual energy, material, and water consumption by improving technology and management processes.
View efficiencies in:
- Wastewater Management and Recycling
- Gas Emissions Management
- Solid Waste Recycling and Reuse
- Waste Paper Recycling
Improvement of Energy and Resource Efficiency
Gold Huasheng mill plays a leading role in Suzhou’s industrial development. With an investment of over $700,000 in new power and lighting equipment, Gold Huasheng was able to save 29,100 tons of coal over 3 years, and reduced significant amounts of carbon sulfur dioxide emissions.
Hainan mill continuously improves production processes, reducing the usage of certain chemicals, generating less pollutants, and increasing the efficiency of water use. In 2008, Hainan reduced its consumption of coal by 60,800 tons, reducing emissions of sulfur dioxide by 163 tons. Hainan also recycled 2.81 million square meters of water (95%) and ensured that the quality of its wastewater was better than Level 1 of the cleaner production standard for the paper industry. In terms of tons of wastewater discharged and COD emissions per ton of pulp, Hainan’s performance was higher than industry standards.
Wastewater Management and Recycling
The process of cooking wood chips produces large quantities of lignin residue as a byproduct. This alkaline, dark brown liquid is commonly known as “black liquor”. Hainan mill has invested large sums in wastewater management to develop state-of-the-art facilities to completely recover and recycle the black liquor as fuel for the cooking process. The head generated by burning the black liquor is used to generate electricity, meeting most of the energy needs in the mill. This strategy has helped to greatly reduce production costs while protecting the environment.
The pulp and paper making process results in the production of both alkaline and acidic waste water. By using advanced technologies and equipment, the water in the system is continuously recycled to reduce wastewater discharging. After a three-step purification process, the discharged waste water is much better than industry standards, and can even be used for irrigation or rearing fish.
Gas Emissions Management
The adoption of the following three measures ensure that the quality of all treated gases are well within environmental standards:
- The malodorous gas produced in the pulp making process is sent for combustion in the alkali recovery boiler via a fully enclosed system which effectively recovers cooked sulfide simultaneously.
- Waste gases produced from the pulp bleaching and chemical production process are chemically treated to eliminate pollutants before being released in the atmosphere.
- Dust in gases generated from boilers and limekilns has the electrostatical precipitate removed before the gases are released into the atmosphere
Solid Waste Recycling and Reuse
Through scientific management, Eagle Ridge Paper’s mill suppliers have greatly reduced the impact of solid waste on the environment. The waste generated in the production process – including bark, wood chips, pulp residue, sludge and other solid waste – is burned in multi-fuel power boilers. “White sludge” (mainly composed of calcium carbonate) generated in the alkali recovery process is sent to the limekilns for combustion and recycling, while the “green sludge” generated is recycled as a raw material for making cement.
Waste Paper Recycling
Of all paper-based industrial enterprises, Ningbo Zhonghua and Ningo Asia mills are among China’s largest users of recycled waste paper as raw materials, recycling more than 200,000 tons and 400,000 tons of waste paper respectively each year (of a total annual capacity of 300,000 tons and 1,000,000 tons). They collect newspaper, office paper, magazines, and other sources as raw materials for high-quality industrial cardboard packaging. One ton of waste paper can be used to produce 0.8 tons of paper, which saves 17 trees from being cut and 3 cubic meters of landfill space. In addition, only half as much energy is required to process waste paper compared to producing new paper, which saves approximately 17 million trees a year. Ningbo Zhonghua and Ningo Asia’s active use and recycling of waste paper is helping to conserve limited forest resources.