Greetings Wei,I agree with ...
Published by Marcus Moore
Greetings Wei,
I agree with Nuno in the recommendation of using ph adjustments (from acidic to a ph of 10 or the reverse) to remove soluble materials from your boiler wastewater stream. Removing soluble material from just the backwash boiler flow will reduce the COD from your total wastewater stream. Treat at the source!
Depending on the boiler backwash flow and your budget, find a small clarifier to separate solids from treated water. This will allow you to remove solids containing most of the COD from ph adjustments. I also suggest doing a few lab samples with the boiler backwash/ wastewater to determine the amount of acid and caustic that is needed.
Don't forget finding a way to dispose the solids too.
Marcus
1 Comment
Yes, agree on that if BCCW is mainly soluble iron or other metal waste. However, we are not sure whether the COD is caused by the cleaning chemical or soluble metals.
Published by WEI CHOEW LEE, Employee at Organo (Asia) Sdn Bhd
1 Comment
Ph adjustments with a little polymer will remove most metals. Lab test a small sample of your boiler backwash water using the ph adjustment method (you should observe solids forming when you change the pH of the boiler backwash water) then measure the COD of the boiler water without the solids in it to see how much the COD is reduced. Take a look at the pH of the cleaning/ scale removal chemical to get an idea where to start with adding acid or base. Keep us posted with the results.
Published by Marcus Moore