Teaching Practice on the Anaerobic Degradation of Biodegradable Plastic Products

Given the severe pollution caused by traditional plastics, biodegradable plastic products (BPPs) have received great attention and are appearing in people’s lives in the form of packaging bags, tableware, etc. Whether a wide variety of BPPs can truly degrade depends on the environment. Aerobic composting is the arbitration method to evaluate the degradability of BPPs in a premarket review, so only the aerobic degradability of BPPs can be guaranteed. Anaerobic digestion has become an irreplaceable part of the global carbon cycle and a mainstream technique to dispose of organic wastes. However, little attention has been given to the anaerobic degradation of BPPs, which may cause environmental pollution if BPPs are not degraded within a short time period. Students are not aware of these issues. Therefore, the teacher carried out teaching reforms in biochemistry course by designing anaerobic degradation of commercially available BPPs as a laboratory exercise for undergraduate students to form a correct understanding of the actual anaerobic degradation performance of BPPs, establish a more comprehensive theoretical knowledge framework of catabolism in biochemistry course, and train their hands-on ability and operation skills. This paper provides an introduction to the experimental design and teaching process of the anaerobic degradation of BPPs, and the results show that the degradation degree and rate are closely related to the components of BPPs. The results of the quizzes and questionnaires show that teaching reform is not only beneficial for deepening students’ impression and understanding of anaerobic catabolism from ubiquitous BPPs in everyday life but also helpful for promoting their environmental awareness by selecting and using BPPs with better degradability. This teaching reform offers references and guidance for the teaching practice in courses like biochemistry, environmental microbiology, environmental chemistry, and waste treatment.