Difference between revisions of "Team:Exeter/Current Methods"
| Line 16: | Line 16: | ||
<h2><u>Treatment at Wheal Jane </u><h2> | <h2><u>Treatment at Wheal Jane </u><h2> | ||
| − | <img src="https://static.igem.org/mediawiki/2017/ | + | <img src="https://static.igem.org/mediawiki/2017/6/65/T--Exeter--Whealjane_sign2.jpeg" height="30%" width="50%"> |
<img src="https://static.igem.org/mediawiki/2017/9/95/T--Exeter--veolialogo.jpeg" height="10%" width="20%"> | <img src="https://static.igem.org/mediawiki/2017/9/95/T--Exeter--veolialogo.jpeg" height="10%" width="20%"> | ||
| Line 29: | Line 29: | ||
<h3><u>Pre-reaction chamber</u></h3> | <h3><u>Pre-reaction chamber</u></h3> | ||
<h4>Mine water is mixed with recirculated sludge to encourage the formation of dense particles.<h2> | <h4>Mine water is mixed with recirculated sludge to encourage the formation of dense particles.<h2> | ||
| − | <img src="https://static.igem.org/mediawiki/2017/ | + | <img src="https://static.igem.org/mediawiki/2017/d/d1/T--Exeter--prereaction2.jpeg" height="40%" width="30%"> |
<h3><u>Reaction Chamber </u></h4> | <h3><u>Reaction Chamber </u></h4> | ||
<h4>A Lime Slurry is created from hydrated lime powder and is then added to the mine water for two purposes: | <h4>A Lime Slurry is created from hydrated lime powder and is then added to the mine water for two purposes: | ||
1) to increase the pH of the acidic water to a target value of approximately 9.2 pH, 2) to cause the precipitation | 1) to increase the pH of the acidic water to a target value of approximately 9.2 pH, 2) to cause the precipitation | ||
of metal ions. Air is circulated into the reaction chambers.</h4> | of metal ions. Air is circulated into the reaction chambers.</h4> | ||
| − | <img src="https://static.igem.org/mediawiki/2017/ | + | <img src="https://static.igem.org/mediawiki/2017/7/77/T--Exeter--reactionchamber2.jpeg" height="40%" width="30%"> |
<h3><u>Lamella Clarifiers</u></h3> | <h3><u>Lamella Clarifiers</u></h3> | ||
<h4> A polymer is added to the mine water, binding to the metal it causes them to coagulate. Under the force | <h4> A polymer is added to the mine water, binding to the metal it causes them to coagulate. Under the force | ||
of gravity the mixture separates out into distinct layers, the higher density sludge particles sink to the bottom | of gravity the mixture separates out into distinct layers, the higher density sludge particles sink to the bottom | ||
and the water rises forming the top layer. The sludge is recirculated in the system until it reaches a specific density.</h4> | and the water rises forming the top layer. The sludge is recirculated in the system until it reaches a specific density.</h4> | ||
| − | <img src="https://static.igem.org/mediawiki/2017/ | + | <img src="https://static.igem.org/mediawiki/2017/7/70/T--Exeter--Coagulation2.jpeg" height="50%" width="40%"> |
| − | <img src="https://static.igem.org/mediawiki/2017/ | + | <img src="https://static.igem.org/mediawiki/2017/1/16/T--Exeter--Lamella_Clarifies2.jpeg" height="50%" width="40%"> |
<h3><u>Clemows Valley Tailing Dam</u><h3> | <h3><u>Clemows Valley Tailing Dam</u><h3> | ||
<h4>When the Sludge reaches the required density it enters a holding tank and is later pumped to the Clemows | <h4>When the Sludge reaches the required density it enters a holding tank and is later pumped to the Clemows | ||
Revision as of 12:10, 21 September 2017
.
Current Methods
Treatment at Wheal Jane
The current method of mine water treatment at the Wheal Jane site is provided by Veolia Ltd. The company, who operates under the Coal Authority, delivers the services and facilities to treat the water in addition to providing safe long term storage of the resultant hazardous residue from the treatment process.
Water is pumped from mine
10 stainless steel pumps costing £13,000 each are used to pump water from a mine shaft at rates up 330 l/s. The plant is separated into two distinct stream of treatment, so that if one fails the plant may continue treatment.
Pre-reaction chamber
Mine water is mixed with recirculated sludge to encourage the formation of dense particles.
Reaction Chamber
Reaction Chamber
A Lime Slurry is created from hydrated lime powder and is then added to the mine water for two purposes: 1) to increase the pH of the acidic water to a target value of approximately 9.2 pH, 2) to cause the precipitation of metal ions. Air is circulated into the reaction chambers.
Lamella Clarifiers
A polymer is added to the mine water, binding to the metal it causes them to coagulate. Under the force of gravity the mixture separates out into distinct layers, the higher density sludge particles sink to the bottom and the water rises forming the top layer. The sludge is recirculated in the system until it reaches a specific density.
