I am no expert on treatment ...

I am no expert on treatment of this industrial effluent, but home laundry would have grit and solids, organics, fecal coliforms, and detergents, at least; in lower concentrations than domestic sewage, but similar in general quality. The detergents are certainly biodegradable. I did lots of experiments with them in graduate school back in the day. That suggests that biological treatment may be a more cost-effective solution than chemical treatment, especially if life-cycle costs and environmental consequences of the manufacture of the chemicals are considered. Could be a good application for a membrane bioreactor. The UF membranes may do a good enough job at disinfection that post secondary disinfection may not be required.