Green compost is an amazing way to reduce, reuse, and recycle waste. A common problem that compost faces are the traces of heavy metals, which limit land application. In findings by Singh, J., & Kalamdhad, a year ago, they assessed the bioavailability of heavy metals using cattle manure, with and without natural zeolite.
They now take their research further, seeking to find the optimum dose of natural zeolite in composting that leads to a better composting product suitable for agricultural or other purposes. In green waste compost the application of natural zeolite is studied, they record the temperature, pH and organic matter degradations on speciation of heavy metals.
The compost of the water hyacinth is contained in a rotary drum. Using the Tessier sequential extraction method, and ratios of 6:3:1 was mixed with 5, 10, and 15% natural zeolite by weight. The addition of natural zeolite increased the pH in the feed mixture and organic matter, and consequently, the heavy metals were influenced. Results showed the success in reducing the bioavailability of heavy metals significantly due to the combined effects of the best quantity of natural zeolite mixed with cattle manure and sawdust used in the rotary drum.
Singh, J., & Kalamdhad, A. S. (2013). Assessment of bioavailability and leachability of heavy metals during rotary drum composting of green waste (Water hyacinth). Ecological engineering, 52, 59-69.
Singh, J., & Kalamdhad, A. S. (2014). Influences of natural zeolite on speciation of heavy metals during rotary drum composting of green waste. Chemical Speciation & Bioavailability, 26(2), 65-75.