greensand


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Related to greensand: manganese greensand

greensand

[′grēn‚sand]
(geology)
A greenish sand consisting principally of grains of glauconite and found between the low-water mark and the inner mud line.
(materials)
A highly siliceous sand that contains small amounts of magnesia and alumina, with about 8% of its bulk in powdered coal or charcoal; dampened with water to make foundry molds.
(petrology)
Sandstone composed of greensand with little or no cement.

greensand

A resin used to oxidize the soluble iron in water and then to filter it out.
References in periodicals archive ?
Processes using manganese greensand or manganese oxide coated media are relatively inexpensive techniques for radium removal [29].
The oxidation process that causes iron to precipitate before the contact of Manganese Greensand can be seen in the following reaction:
Add slow-release rock powders and mined mineral deposits such as greensand, azomite, colloidal rock phosphate, and lime if soil tests suggest a need for amendment.
Colour: Shadesrange from bright yellows, greensand blues to albinos.
Solymar M, Fabricius IL (1999) Image analysis and estimation of porosity and permeability of Amager Greensand, Upper Cretaceous, Denmark.
Sedimentary" deposits are land- or ocean-derived and include rock powders, greensand, glacial rock dust and sea solids.
Horizons: NP8, Zone 6, Picateway Member, Aquia Formation, Palaeocene to Greensand of Eocene.
Penrose (1889) described these deposits: "On south side of river is a low bluff of greensand from 1-4 ft above the water and about 1/4 mile long and full of shells .
It does not need chemical regeneration with a solution of potassium permanganate like Birm, Filox, and Manganese Greensand, but only mechanical backwash at a rate of 60-70 m/h in 24 h, and dosing of a relatively small amount of active chlorine (0.
The Manganese Greensand filtration process efficiently and economically removes iron, manganese, arsenic, radium, and hydrogen sulfide in municipal, industrial, point-of-use, and many other applications.
70) which was sensational - a huge bowl of soup and noodles, with half a boiled egg surrounded by a colourful array of seaweed, prawn, crabstick, Japanese fish cake, chicken, fried tofu, greensand spring onions.
Current filtration technologies include manganese greensand (a longstanding, proven technology), newer technologies that use proprietary media (allowing for higher filter loading rates), and membrane filtration.

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