Industrial wastewater treatment
1, printing and dyeing wastewater treatment, instead of the traditional low molecular weight iron salt and aluminum salt coagulant, relative to the traditional coagulant dosage is large, low coagulation efficiency, aluminum ions and other residues easy to cause secondary pollution characteristics, polymeric iron sulfate dosage of about 150ppm, its dosage is small, the COD and chromaticity removal rate is high, the best ph condition is: 8.0. [2]
2, electroplating sewage treatment, can be used as coagulant and cracking agent. The complex is mainly a copper-ammonia complex, which is stable in nature, pH = 11, and it is difficult to directly precipitate with coagulants such as alkali and polyalumin. It can also be used as a reclaimed water reuse.
3, papermaking wastewater treatment, instead of polyaluminum chloride, aluminum sulfate, etc., used as a coagulant, can also be used as papermaking sludge dehydration, in the papermaking wastewater treatment whitewater recovery process can not use poly-ferric sulfate (polymer containing strong cations), can only use polyaluminum chloride.