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Besides Moringa oleifera seeds and chitosan, which natural coagulants can remove turbidity from water?

We are designing a low-cost, sustainable filtration system for a rural community. While Moringa is effective, it isn't locally available. We need to test indigenous alternatives. I'm looking for specific, documented examples of seeds, fruit extracts, or other plant materials that have demonstrated measurable coagulation-flocculation activity in peer-reviewed studies.

 

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By Raghav V Answered 3 years ago

I've field-tested several alternatives where Moringa wasn't an option. Cactus mucilage, particularly from Opuntia ficus-indica, is excellent; the polysaccharides act as a bio-flocculant. Tamarind seed powder is another strong candidate it's rich in polysaccharides and proteins. For high-clay turbidity, I've seen good results with fenugreek seeds. Crucially, performance is pH-dependent. I would recommend starting with a simple jar test of locally available materials: grind seeds into a fine powder, create a stock solution, and test across a range of pH and dosages. Often, the most sustainable option is the one that grows next to the community.

 

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