Walter Jehne – Cooling The Climate and Restoring Ecosystems with Water Restoration


Sand & Moringa Seed Water Filter Removes Bacteria

In the new study, the team, including a group of Penn State undergraduates led by graduate student Boya Xiong, packed the sticky sand into filter columns about 1 cm in diameter and 5-10 cm high, and testing the columns with extract from different amounts of seed to optimize performance. In experiments with 1-┬Ám-diameter polystyrene particles, which have about the same size and charge as bacteria, they found that the sticky sand caught 99.99% of particles, compared with 13.55% for sand alone. The sticky sand also removed 108 viable E. coli cells per milliliter. They estimate that a household-scale filter 1 meter tall and 5 cm in diameter that provides 10 L of water per day would require 0.2 kg of seeds per year, whereas a Moringa tree produces about 480 kg of seeds per year.

Tropical tree seeds provide sustainable water filtration | Chemical & Engineering News

Soil Substrate Comparison: Water Retention

Bonsai Soil Tests: Part 1: Water Retention

Retention Values (g @ %) given after 5.25-hour
Rank given for 24-hour Retention based on values.

Organic Rankings:
1. Coconut Coir: 129g @ 14.57% loss
2. Pine Bark: 22g @ 14.86% loss
3. Compost: 26g @ 31.58% loss
4. Commercial Peat Moss: 6g @ 40% loss

Inorganic Rankings:
1. Diatomaceous Earth: 37g @ 30.19% loss
2. Akadama: 22g @ 26.67% loss
3. Pumice: 22g @ 29.03% loss
4. LECA (Turface): 30g @ 36.17% loss
5. Vermiculite: 28g @ 41.67% loss
6. Perlite: 14g @ 36.36% loss
7. Sand: 12g @ 67.56% loss
8. Lava Rock (Scoria): 4g @ 76.47% loss
9. Expanded Shale: 2g @ 84.62% loss
10. Granite Chips: 1g @ 94.44% loss

Quick Correction: Diatomaceous earth is not calcined clay, like Oil-Dri. It is silica based, formed from fossilized algae.