The main source of municipal wastewater is sewage, the main waste water produced in human activities in daily life is living waste and human excreta, including wastewater kitchen sink, shower, laundry, etc., and flush toilets sewage.
Water quality is relatively stable, but muddy, dark and has a stench, was slightly alkaline, high nitrogen and phosphorus content, generally non-toxic substances, while sewage is suitable for the propagation of various microorganisms, so often contain large amounts of bacteria (including pathogens ) virus and parasite eggs, such sewage is good biodegradability, are relatively easy to handle sewage.
The general municipal wastewater treatment using AAO SBR MBR, etc.
The general process:
Coarse grid – fine grid – primary sedimentation – biochemical pool – secondary sedimentation tank – ceramic filter – quick filter – disinfectant pool – Reuse
From the coarse grid
Primary sedimentation pond is called a treatment (a treatment to remove pollutants can reach 30-60%)
Secondary settling tank is called secondary treatment (secondary treatment pollutant removal rate of 80-90%, to meet emission standards)
After the part is tertiary treatment, after treatment sewage reached reuse standards
Different process: the main core processing structures differ