Improve Water Runoff Quality by the Development of a Green Roof Substrate

 Green roof substrates have become increasingly well-known within the environmentalist community as a concept that describes many benefits. These benefits include runoff volume control (usually during storms), minimizing the chance of having a heat island effect, lowering noise, reducing building energy use, and allowing for solar panels to perform better. A cost would include frequent rock and soil erosion. The materials that were used in these experiments included crushed brick, sand, coco-peat, expanded perlite, and exfoliated vermiculite, which created the green roof substrate. The methods included substrate analysis, which was done by measuring the green roof substrate components (1g of the components as well as 100mL of DI water in a shaker for 24 hours and then filtered through a 0.45 μm membrane filter). With the plant growth experiments, plant cuttings of P. grandiflora were each put into 175mm pots that each contained a green roof substrate mix. The plants were watered every 2 days. After one month plants were weighed after being removed from the substrate (the roots were carefully washed to prevent damage and then the plant samples were placed in an oven at 60℃ for 48 hours). The results indicated that the substrate mix that affected plant growth the most was mix 12 which had 20% vermiculite, 30% perlite, 20% crushed brick, 10% sand, and 20% coco-peat. Green roof substrates can create a more sustainable environment by using optimal materials for plant growth.


The figure shows the general materials that could be used to create a green roof substrate
https://www.sciencedirect.com/science/article/abs/pii/S0043135414004412

Reference:

Vijayaraghavan, K., & Raja, F. D. (2014, June 18). Design and development of green roof substrate to improve runoff water quality: Plant growth experiments and adsorption. Water Research. Retrieved October 28, 2022, from https://www.sciencedirect.com/science/article/abs/pii/S0043135414004412


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