Bioremediation and waste management

Microbial Management Systems provides innovative environmental solutions to restore and build microbial communities that are required for soil health and which can be utilized for organic waste management.

Case study: rehabilitation of mine sites

Developing a soil structure, increasing organic matter content and turnover, and increased nutrient cycling are key to establishing a stable post-mining soil for the re-establishment of a self-sustaining vegetative cover. Microorganisms are vital to these processes occurring. Monitoring and managing soil microbes during soil removal, storage and replacement can minimize microbial community changes to ensure that soil substrates are optimised for re-use in rehabilitation activities.

Our work has shown:

Case study: microbial production of extracellular polymeric substances (EPS) utilizing waste organic matter

The production of EPS is a common property of many soil microbes. We are developing microbial polymer applications which can be produced at low cost utilizing local organic waste stocks as eco-friendly solutions for soil stabilization and erosion reduction during the crucial period before vegetation cover is established on soil. Biopolymers increase soil wettability and water holding capacity, increase soil aggregate formation, and can stimulate growth of fungal hyphae in soil leading to a further increase in soil aggregation. The photos below show the effects of a biopolymer application on soil aggregation.

Soil samples

Case study: the oyster mushroom and woody waste

Large quantities of organic wastes are generated through the activities of the agricultural, forest and food processing industries. A significant proportion of these wastes are not reutilized, resulting in negative economic and ecological impacts. However, appropriate bioremediation can convert these wastes into valuable economic and environmental resources which can be of further value, especially in soil restoration activities.

For small-scale horticultural businesses, the generation and disposal of waste streams may impact upon profits and have serious ecological implications within the local environment.

A project undertaken for Horticulture Australia Ltd identified the oyster mushroom, Pleurotus ostreatus, as a suitable microbial bioremediation agent for woody horticultural waste streams in the Hawkesbury region neighbouring the Greater Blue Mountains World Heritage Area and demonstrated conversion of these wastes from potential environmental and economic liabilities into economic and environmental benefits.

The photos below depict the steps from woody waste to mulch to mushrooms.