Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

High nickel in our wastewater

March 12, 2009

hello all!
I don't understand why high nickel in my wastewater. we reduce nickel by NaOH at pH = 9, Nickel about 40-60ppm
thank you very much!

Quyet Thang
student - Viet Nam

---

March 15, 2009

Hi, Thang. I think you need to precipitate at a higher pH, say 10.5, but that may not be all that is wrong. Where does the nickel come from, electrolytic plating or electroless plating? You may need to do a chelate breaking process. Try to tell us more about your situation.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.

Thang. As Ted has mentioned, more information is required about the waste water stream to fully understand your problem. Is the nickel soluble or insoluble, is it a water /solids issue or a complexed metals issue, what are you currently using to treat, is the end result a clear supernate etc.

Gordon Djani
- Greenville, South Carolina
March 19, 2009

---

We have plated three nickel and a Chromium. We have a treatment wastewater. Solution with NiSO4+ small NiCl2 after treatment at pH = 9-11 is 5 ppm but if NiCl2 is high in solution, when treatment at pH=10-11, [Ni2+]=30 ppm. I tried to added NaOH but it doesn't reduce. When I added Ca(OH)2, It reduce much! What is this problem ?

Thanks!

Quyet Thang
student - Viet Nam
March 24, 2009

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

---

---