Determining if WWT sludge is hazardous?
– October 9

123/75. Remove Copper from Plating Waste
– September 23

617/14. Sludge from ETP plant
– August 21

44241. Neutralization of Chrome after Plating
– May 9

59691. Sodium Metabisulfite and its reaction with water
– March 26

  7063. Recovery of copper from electroforming solution
– January 7

  7245. How to treat BOD and COD in finishing wastewater
– December 21

61620. How to deal with galvanizers waste acids

12215. Change Hexavalent to trivalent chrome? Chrome Reduction process
– October 11

  3932. Ion Exchange / DM plant calculations

• pH of DM water is a mystery
– August 30

• Mixed bed De-ionization: How to separate cation resin from anion
2ND REQUEST – August 17

• Table of Water Resistivities

• Can RO water be used in manufacturing phosphatizing chemicals?

• Algae/Fungus/Biological Growth in Plating & Anodizing Rinse Tanks
– June 17

• Removing Chrome Contamination from Glycol Cooling Loop
– May 27

• Using waste pickle liquor (ferrous chloride & hydrochloric acid) to break an oil-in-water emulsion
– May 22

• Filter to take zinc out of drain water so galvanized parts can be washed

• Cost of demineralizing water (“price per ton of water”)

• High COD mixed bed polisher regeneration effluent

• Portable DI water columns fade at customer, but are fine when re-tested
– March 28

• Cyanide Disposal/Destruction for school lab
– March 11

• How to electrowin/recover copper (plating waste)

• Caustic & aluminum recovery from cleaning processes
– February 21

• Recovery of copper from electroplating & etching solutions

• Recycling of Chrome Stripping solution (HCl)
– December 30

• DM System Problem: Poor OBR, short SBA life

• TDS vs PPM vs. µS?
– October 14

• Trivalent Chromium vs. Hexavalent — what are the differences? – August 31

• Recycling of chrome sludge

• Ferrous Chloride vs. ferric chloride for reducing H2S levels

• Defects on test panel left in the water – June 2

• Can Trivalent Chromium degrade into Hexavalent Chromium? – May 3

• Dangers of drinking deionized water

• Methods for pH measurement in D.I. water15