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 | Shincci  Global

Drying Technology

 | Shincci  Global Drying Technology


How to Treat Colored Sewage?

Upload time:2021-06-23

Colored sewage usually appears in various industrial sewage treatment sites. For example, papermaking or papermill wastewater is generally black, distiller's grain wastewater is yellow-brown, and electroplating wastewater is blue-green.

Colored Sewage Content

 ●  Light yellow sewage--the iron content in the water has exceeded the standard;

 ●  Black sewage--serious pollution of manganese ions;

 ●  Gray--white sewage-there are a lot of humus and clay particles;

 ●  Grass green sewage—contains chlorine sulfide;

 ●  Light blue/green sewage-containing ferrous oxide and contaminated waste water.

How to deal with such colored sewage?

For example, electroplating wastewater, the bleaching mud of the biochemical pond is often black in the process of treatment, or the wastewater from the secondary sedimentation tank is black in large amounts. 
What is the cause? How to solve it?
Reasons for the black color of electroplating wastewater after treatment:
If polyferric sulfate is added during the chemical coagulation process, the iron salt reacts with the sulfide in the wastewater to form iron sulfide, which will cause the effluent to turn black.
The solution is to add lime to treat the sulfide first, and then add coagulant.

Whether it is electroplating wastewater or other industrial wastewater, several indicators that exceed the standard often need to be treated, mainly ammonia nitrogen, cod, phosphorus, and heavy metal ions. 
In view of these different indicators, it is recommended that please add the environmental protection agents, without pollution.
Environmental protection agents suitable for sewage treatment in various industries: ammonia nitrogen remover, water purification agent, phosphorus removal agent, heavy metal capture agent. If these indicators are normal, only need to decolorize, you can add a decolorizing agent for processing.

The same is the sludge treatment equipment. Why do so many people choose that one?


Appreciate if you may continue to submit following chart so that we can offer accurate
investment cycle for your reference



Sludge Type:
Dewatering Type:
DS Rate--for liquid sludge inlet to dewatering machine (Only needed when we are expected to offer dewatering machine):%
Inlet sludge: Tonne(s)/Day
Inlet moisture: %
Outlet moisture: %
Working hours:Hour(s)/Day