Alum vs. ferric chloride?

What is the hydraulic retention time HRT and Sludge retention time?

can you give example in nitrification process

thank u

If only have data as below:

-Assume fine bubble aeration tank system

- Operating temp at 30 degree C

- Max air flow of fine bubble diffuser is 5 m3/h (at STD 20 degree C)

- SOTE = 6.5% per meter depth

- Assume tank has 5 meter depth

- Use blower driven 0.75 kW (1HP)

Please advise.

In some instances, adsorption data fits both to the Langmuir and Freundlich model. What could be the justification to this as langmuir states the monolayer adsorption whereas Freundlich implies heterogeneous adsorption? Thank you. Attach references wherever possible.

Greetings.

In formaldehyde test, there are control solution for 2.5ppm, 5ppm, 10ppm... and so on. But formaline contains maximum 37~38% of gas formaldehyde, how can I make n(number) ppm formaldehyde solution using this?

What is difference between activated sludge flocs and granules. How can I differentiate? In terms of its appearance especially?

Adsorption properties of polymer can be investigated by adsorption isotherms in the batch experiments. These isotherms provide a relationship between the concentration of the analyte in solution and that adsorbed on the solid sorbent when the two phases are at equilibrium. Langmuir and Freundlich isotherms are usually used to analyze the sorption data in the IIP (Ion Imprinted Polymer) studie. Is it possible for sorbent to follow both isotherms in the same time?

Hi everyone

I'm looking for a way to measure ozone concentrations in water.

The best method I have found is accurate and sensitive was the Indigo method, but unfortunately it is very expensive in our country due to the boycott.

Can I use a method that is suitable for low concentrations of ozone?

Can I make Potassium Indigo Trisulfonate Salt from Indigo or Indigo Carmine?