Phosphorus in industrial sewage mainly comes from phosphide of raw materials.

At the same time, the use of phosphorous detergent in daily life will also increase the phosphorus content in domestic sewage.

In addition, other industries such as chemical, paper, pharmaceutical and other industries discharge wastewater often contain organophosphorus compounds.

So is there a way to apply to each industry phosphorus exceed the standard?

I'm studious about this problem

We consulted our engineers specifically

The answer is: "Chemical phosphorus removal!"

At the same time, the engineers also detailed that chemical phosphorus removal is done by chemical precipitation process. Chemical precipitation refers to the addition of chemicals to sewage.

But the location of phosphorus removal agent precipitation is also exquisite, in practice, often used are: pre precipitation, synchronous precipitation and precipitation.

1
Before the precipitation

Add l precipitator to raw water before settling tank. It usually requires setting up a vortex generator or supplying energy to meet the mixing needs.

The resulting precipitate products (massive flocs) are separated by precipitation in a sedimentation tank.

If the biofilter is used in the biological section, Fe2+ agent is not allowed to prevent harm to the packing (yellow rust).

The pre-sedimentation process is suitable for retrofitting existing wastewater treatment plants (adding chemical phosphorus removal measures) because not only can phosphorus be removed through this process step, but also the load on the biological treatment facility can be reduced.

2
Synchronization of precipitation

Synchronous precipitation is widely used, which is to add phosphorus removal agent in the aeration tank outlet water or secondary sedimentation tank inlet, individual cases also add phosphorus removal agent in the aeration tank inlet or reflux sludge channel (pipe).

At present, synchronous precipitation is used in many wastewater treatment plants, and the effect of dosing on activated sludge is relatively small.

3

After precipitation

The process of precipitation, flocculation, and separation of the flocculated material in a facility separate from the biological facility is post-precipitation.

Add phosphorus removal agent to the effluent, generally add phosphorus removal agent to a mixing tank after the secondary sedimentation tank, and then mix precipitation. A flocculation tank and a sedimentation tank (or an air flotation tank) are provided behind it.