This article investigates the potential environmental impacts of four-layer printed circuit board (PCB) production from cradle to grave. The study starts with a lifecycle assessment of conventional PCB production. Then, the alternative materials of polyethylene terephthalate (PET), polylactic acid (PLA)/glass fiber composite and paper are investigated for the substrate. A conventional PCB adopts copper as the conductive material and requires an etching process. The environmental impacts of changing the conductive deposition method to an additive method by printing silver nanoparticles is studied. In a conventional PCB, electricity generation contributes 41% of the global warming potential (GWP) and 38% of the abiotic resource depletion (ADP), in the fossil category. By applying an additive manufacturing method, the GWP of PCB manufacturing can be reduced to 14% of that of the conventional method. A sensitivity analysis of silver recycling illustrates that a 40% higher silver recycling rate would decrease the GWP of silver material by about 48–60%. Uncertainty in the energy consumption of PCB production would alter the environmental impacts; however, even with the most conservative energy consumption in a conventional PCB production method, the environmental impacts of the additive method are about five times lower than those of conventional PCB production.

The demand for printed electronics (PE) is expected to increase for improved functionality and autonomy of products in the context of the Internet of Things, especially for sensing and communication. With this trend, the environmental performance of novel technologies is of growing importance, and researchers are exploring ways to make them more environmentally friendly using bio-based substrates and additive printing methods. Conductive inks have the highest environmental impact in the life cycle of PE, and there are two options to decrease the impact: increase recycling rates or replace commonly used silver inks with less impactful materials such as copper or graphite. With the current mixed waste management system, a higher recycling rate for silver is not achievable. Copper and graphite have a lower environmental impact than silver, however, the electrical conductivity of copper and graphite inks is lower than silver ink. This article introduces a double-parameter comparison to simultaneously assess the environmental and electrical conductivity of PE using three inks of silver, copper, and graphite inks. Then based on the technical feasibility, this study proposes suitable applications for each substrate and ink combination.

There is an increasing call for products following circular economy principles. Despite growing pressure, understanding of the current situation and development vectors is largely missing. In this study, circular economy workshops were arranged for six industrial companies manufacturing electronics and operating in Finland to obtain an empirical understanding of the current state of circular economy implementation. During the workshops, each company assessed the state of the circular economy for a chosen product using a set of 51 circular economy strategies, i.e., the circularity deck. The results indicated that circular economy principles were implemented in only 25% of the cases. This is mostly related to the production of smaller, thinner, and lighter products. The results also indicate a large improvement potential of 36% for the participating companies. This is the share of cases that are planned for implementation. Those strategies mostly relate to the use of recycled inputs, the development of products made of a single material, and the design of products suitable for primary recycling. The least relevant or even irrelevant strategies were those related to the use of information technologies and artificial intelligence, despite electronic products being the enablers of such strategies for the other companies. Therefore, to further increase the circularity of electronic products and to meet the demands and interests of the manufacturing industry, research work on the technologies and services enabling the use of waste as raw materials should be emphasized to close the loops. Finally, the results imply the necessity for a more widespread assessment of circular economy strategies among companies, with consequent development of action plans for their implementation.

Although printed electronics (PE) are a more sustainable option than conventional electronics, proper treatment of PE in their end-of-life phase is crucial to decrease their overall environmental impacts and ensure the materials specifically the metal fraction of PE are recovered. Thus, to investigate the state of the art regarding the research and development of material recovery from PE, this study performed a literature review process. It concluded that the majority of the observed articles rather not mention specifically what is recycling option for recycling the PE or introduced a novel recycling method for the metal ink. Only a marginal fraction of the articles covered proper recycling methods for the metal fraction of PE. Then based on the literature review process, this study investigates the suitability of the current waste management system to recover different fractions of PE products.

There is a significant global rise in the amount of waste electrical and electronic equipment (WEEE). This waste typically contains more than 20% plastic, which can have significant environmental benefits if properly treated and recycled. However, recycling plastics from WEEE is a challenging task due to the complexity of the waste composition, which consists of several polymers, many of which contain heavy metals, additives, and brominated flame retardants. This study presents both technical and environmental concerns in the resource recovery of WEEE plastics. Based on results of a prior research on the composition of waste electrical and electronic plastics (WEEP) in Finland, this study assess the environmental impacts associated with the recovery of WEEP by comparing four technically available WEEP treatment methods: energy recovery (incineration), mechanical recycling of composite plastics, mechanical recycling for separated polymers, and chemical recycling by pyrolysis. This study concludes that mechanical recycling with plastic separation has the best environmental performance among the presented scenarios for all selected impact categories except for the acidification potential impact category. The substitution ratio of virgin plastics and the efficiency of the pyrolysis process were the primary factors contributing to the environmental impacts of WEEP treatment options.