80 percent of the investment is directly designated for initiatives to improve the mill’s environmental performance.

世界上最大的溶解纸浆厂的可持续性提升

When the world takes decisive action to achieve the Sustainable Development Goals, the focus is often on building new, clean industries. But it is at least equally important for existing industries to replace old processes with alternatives that are more sustainable in the long term. AFRY collaborates with pulp and paper company Sappi in their efforts to propel the transition to more sustainable textile production.

In tandem with growing global demand for clothes and textiles, there is an urgent need to transform textile production and consumption to make them more sustainable. The clothing industry has a massive impact on the environment: 20 percent of global water pollution is caused by the textile industry, and textiles made from fossil raw materials like oil pollute both air and water throughout their lifecycles.

Saiccor Mill, located south of Durban in South Africa, belongs to pulp and paper company Sappi and is the largest pulp mill in the world for producing dissolving pulp. These wood-based fibres constitute the raw material for viscose fibres – an alternative to, for example, cotton-based textile fibres whose manufacture requires large volumes of water and environmentally hazardous chemicals. Although viscose fibres have several environmental advantages over cotton-based textile fibres, viscose production is not without problems. Historically, the pulp industry that makes viscose fibres has been based on production processes that are both inefficient and a sizeable source of chemical emissions into watercourses.

In 2016 and 2017 AFRY had the task of studying various solutions for the production process at Saiccor Mill that would be able to meet new demands for sustainability and contribute to a more sustainable textile industry. In early 2018 Sappi commissioned AFRY, together with engineering and technical services company Wood, to implement the improvement measures.

In addition to the technical work, AFRY was also involved in planning and running a training centre that offers practical and theoretical training to local job seekers for various professions required in the construction work: welders, scaffolders, concrete workers, and many more. The training centre became so popular that Sappi decided to keep it going after construction was completed. It will focus on offering skills development, especially to young people not currently in the labour market.

New process design reduces environmental impact

“Saiccor Mill has three production lines, two of which are modern with a high degree of recovery, while the third uses an older process where only 50 percent of chemicals and residues are recycled. This means that organic substances from the wood currently end up in the Indian Ocean. We want to change that,” says Jan-Erik Eriksson, Project Manager at AFRY.

该项目涉及过渡到一种降低残留量的新生产过程,并提高了纤维制造中的资源和能源使用效率。

在Saiccor Mill钙和硫的旧生产线上目前添加到木屑中,分解木材并提取纤维。问题是在该过程中产生的化学物质或残留物不能在恢复电路中恢复。

新工艺将基于镁,这将使化学品能够回收和浓缩的有机物质并在回收锅炉中焚烧。在焚烧期间产生的能量又可以用作工厂的热量和电力,从而大大替代磨机目前运行的旧燃煤锅炉。结果是循环系统,其中磨机的残留物转变为资产。

当新的生产线准备好了2020年上汽cor Mill should account for 10 percent of global dissolving pulp production, but with a 55 percent reduction in CO2 emissions from fossil fuels and 50 percent less waste to landfill than before.

当新的生产线准备好了2020年上汽cor Mill should account for 10 percent of global dissolving pulp production, but with a 55 percent reduction in CO2 emissions from fossil fuels and 50 percent less waste to landfill than before.

“技术本身并不是新的,但该项目的显着方面是,80%的投资是直接指定改善磨机环境绩效的举措。生产能力也在增加,但实际上是次要的,“Eriksson说。