You can use aluminum sulfate ...
Published by Carlos Henrique Catunda Pinto, Professor and Researcher at UERN - Brazil
You can use aluminum sulfate to perform the coagulation of the metals present in the effluent, verifying the best pH in the Jar test. Then an adsorption treatment can be used, always verifying the final destination of the produced effluents, if they are in accordance with the local environmental legislation.