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Sulfate Removal from Acid Mine Drainage Water

IP.com Disclosure Number: IPCOM000242451D
Publication Date: 2015-Jul-15
Document File: 2 page(s) / 47K

Publishing Venue

The IP.com Prior Art Database

Abstract

Anionic ion exchange resin was used to reduce sulfate concentration from Acid Mine Drainage (AMD) water. The post-resin water was collected to prepare regeneration solution to regenerate used resin. The regenerated resin has shown similar sulfate removal efficiency and capacity as fresh resin. The used regeneration solution with high concentration sulfate ion has potential application for cationic resin regeneration or other oil field application.

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Title:    Sulfate Removal from Acid Mine Drainage Water

Abstract:         Anionic ion exchange resin was used to reduce sulfate concentration from Acid Mine Drainage (AMD) water. The post-resin water was collected to prepare regeneration solution to regenerate used resin. The regenerated resin has shown similar sulfate removal efficiency and capacity as fresh resin. The used regeneration solution with high concentration sulfate ion has potential application for cationic resin regeneration or other oil field application.

Description:    

Commercial strong base cationic ion exchange resin was selected for sulfate reducing from Acid Mine Drainage (AMD) water which contains 1500 mg/L or over sulfate ion, 300 to 350 mg/L calcium ion (Ca2+) and 65 to 70 mg/L magnesium ion (Mg2+).  The total dissolved solid concentration was 7, 000 mg/L.

1.      Sulfate removal with fresh resin

Lab scale column testing was conducted using a chromatography column (ACE #15, 15 MM ID 300 MM length) filled with 30 ml fresh cationic ion exchange resin, and AMD water sample was pumped through resin at preset flow rate. The post-resin was analyzed with Inductively Coupled Plasma (ICP) for sulfate, calcium, magnesium and other ion concentration. The concentration of sulfate, calcium, magnesium ion in the post-resin water was illustrated in Figure 1, which indicated that sulfate was efficiently reduced from over 1500 mg/L to less than 10 mg/L for the first 200 ml post-resin water. Figure 1 also showed no concentration change of calcium and magnesium ion after resin treatment.

Figure 1. Sulfate, Calcium and Magnesium concentration

The sulfate amount in water was calculated with the sulfate concentration and water volume, and the difference of sulfate amount between untreated water and treated water was considered as the resin absorbed sulfate ion amount.

2.      Regeneration

In the above testing, the first 200 ml of post-resin water was collected for used resin regeneration. The regeneration solution was prepared by adding industry sodium chloride (NaCl) at 3-5% amount. 2 to 4 bed volume of regeneration solution was slowly pumped through the used resin in the same column. The used post-resin regeneration solution was analyzed with ICP for sulfa...