I agree with Sameer. In ...

I agree with Sameer. In hospital wastewater, I typically use hydrodynamic cavitation to break down any complex chemicals such as your pharmaceuticals, the water may have to go through several static mixers and mechanical aeration depending on the nature of contaminants. Filtration is then done using an Optimised Velocity Filter with Activated Filter Media which will filter down to 0,45 micron to remove microbiological contaminants and other dissolved organics. We have developed such a process successfully here in Australia for potable water supply to hospitals.

We can scale this system to any capacity. The largest we have done is 30kL/h flow rate.  A system of this size would cost approximately 200,000 USD including all design, manufacturing, and commissioning of the system.

Municipal wastewater would have a higher organic load and as such would need biological treatment. I suggest a membrane bio-reactor as an efficient and cost-effective technology to scale to any size for municipal use. I have done projects up to 100kL/day in size, a plant this size would be 874,000 USD including all design, manufacturing, and commissioning of the system.

If you would like to know more, please email me at andrew@waterandoilsolutions.com.au