Abstract
The purpose of this work is to determine parameters for the design of a Moringa seed sand filter for water purification. Moringa oleifera seeds containing cationic antimicrobial proteins have been used as natural coagulants for the removal of turbidity; however, a low removal efficiency and high residual organic levels limit their applications. In this work, Moringa seed extracts were used to reverse the charge of sand (f-sand) to 10 mV at a seed dosage of 5.6 g of seeds/m2 of sand. This f-sand filter demonstrated ∼4 log removal of 1 μm polystyrene particles and >8 log removal of Escherichia coli compared to <0.1 log removal for bare sand. Enhanced removal for particles and E. coli was dominated by attractive electrostatic interactions. Clean bed filtration modeling predicts a sticking coefficient (α) of 0.8 for f-sand compared to a value of 0.01 for bare sand. This α was further validated under a wide range of filtration conditions. Preliminary scale-up analyses suggest a point-of-use f-sand filter that requires a very small amount of seeds annually. The outcome of this work presents the scientific basis for the design of a water purification solution for developing regions, requiring only locally available resources and no use of synthetic chemicals or electricity.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 38-42 |
| Number of pages | 5 |
| Journal | Environmental Science and Technology Letters |
| Volume | 5 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 9 2018 |
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All Science Journal Classification (ASJC) codes
- Ecology
- Environmental Chemistry
- Health, Toxicology and Mutagenesis
- Pollution
- Waste Management and Disposal
- Water Science and Technology
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Moringa oleifera f-sand Filters for Sustainable Water Purification. / Xiong, Boya; Piechowicz, Bethany; Wang, Ziyuhan; Marinaro, Rose; Clement, Emma; Carlin, Taylor; Uliana, Adam; Kumar, Manish; Velegol, Stephanie Butler.
In: Environmental Science and Technology Letters, Vol. 5, No. 1, 09.01.2018, p. 38-42.Research output: Contribution to journal › Article
TY - JOUR
T1 - Moringa oleifera f-sand Filters for Sustainable Water Purification
AU - Xiong, Boya
AU - Piechowicz, Bethany
AU - Wang, Ziyuhan
AU - Marinaro, Rose
AU - Clement, Emma
AU - Carlin, Taylor
AU - Uliana, Adam
AU - Kumar, Manish
AU - Velegol, Stephanie Butler
PY - 2018/1/9
Y1 - 2018/1/9
N2 - The purpose of this work is to determine parameters for the design of a Moringa seed sand filter for water purification. Moringa oleifera seeds containing cationic antimicrobial proteins have been used as natural coagulants for the removal of turbidity; however, a low removal efficiency and high residual organic levels limit their applications. In this work, Moringa seed extracts were used to reverse the charge of sand (f-sand) to 10 mV at a seed dosage of 5.6 g of seeds/m2 of sand. This f-sand filter demonstrated ∼4 log removal of 1 μm polystyrene particles and >8 log removal of Escherichia coli compared to <0.1 log removal for bare sand. Enhanced removal for particles and E. coli was dominated by attractive electrostatic interactions. Clean bed filtration modeling predicts a sticking coefficient (α) of 0.8 for f-sand compared to a value of 0.01 for bare sand. This α was further validated under a wide range of filtration conditions. Preliminary scale-up analyses suggest a point-of-use f-sand filter that requires a very small amount of seeds annually. The outcome of this work presents the scientific basis for the design of a water purification solution for developing regions, requiring only locally available resources and no use of synthetic chemicals or electricity.
AB - The purpose of this work is to determine parameters for the design of a Moringa seed sand filter for water purification. Moringa oleifera seeds containing cationic antimicrobial proteins have been used as natural coagulants for the removal of turbidity; however, a low removal efficiency and high residual organic levels limit their applications. In this work, Moringa seed extracts were used to reverse the charge of sand (f-sand) to 10 mV at a seed dosage of 5.6 g of seeds/m2 of sand. This f-sand filter demonstrated ∼4 log removal of 1 μm polystyrene particles and >8 log removal of Escherichia coli compared to <0.1 log removal for bare sand. Enhanced removal for particles and E. coli was dominated by attractive electrostatic interactions. Clean bed filtration modeling predicts a sticking coefficient (α) of 0.8 for f-sand compared to a value of 0.01 for bare sand. This α was further validated under a wide range of filtration conditions. Preliminary scale-up analyses suggest a point-of-use f-sand filter that requires a very small amount of seeds annually. The outcome of this work presents the scientific basis for the design of a water purification solution for developing regions, requiring only locally available resources and no use of synthetic chemicals or electricity.
UR - http://www.scopus.com/inward/record.url?scp=85041306570&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041306570&partnerID=8YFLogxK
U2 - 10.1021/acs.estlett.7b00490
DO - 10.1021/acs.estlett.7b00490
M3 - Article
AN - SCOPUS:85041306570
VL - 5
SP - 38
EP - 42
JO - Environmental Science and Technology Letters
JF - Environmental Science and Technology Letters
SN - 2328-8930
IS - 1
ER -