Primary treatment of sewage using the IntenSieve®
The process of a sewage treatment plant (STP) can be divided into separate phases.
- Preliminary treatment: the removal of coarse particles, such as sand, sticks and bags
- Primary treatment, the removal of suspended solids and organics
- Secondary treatment: this involves the removal of dissolved nutrients and organics.
- Tertiary treatment or effluent polishing
Removal Efficiency is dependent on the amount of bonded COD, BOD, TKN and TP to suspended solids.
The sludge recovered by the Intensieve from sewage contains considerable amounts of cellulose, which can be reused for many applications and products.
Working principle of the IntenSieve®
Figure 1: IntenSieve® CT-170
The IntenSieve® is designed for high efficiency solids removal from sewage, aquaculture and industrial- and municipal (waste)water streams. It is particularly effective for removing suspended solids (TSS) from liquid streams, improving water quality, and recovering valuable material. The machine is designed to treat (waste)water streams which, next to solids, may contain high concentrations of fats, oils, or grease (FOG).
Figure 2: IntenSieve® working principle
Sewage treatment ®
Studies and practical experience with rotating belt fine sieves show the following:
- Building a pre-coat on the filter mesh has a major effect on the solid’s removal efficiency. Even at high volumetric loads, particles that are smaller than the mesh pore size of the filter mesh are removed with high efficiencies.
- The filtermesh has little influence on the removal efficiency. The built-up pre-coat is more decisive for the separation efficiency, although it should be noted that the larger mesh size does have a higher permeability (also with pre-coat) and therefore allows more water to pass through and allows a higher processing capacity.
- To be able to make the right choice of the mesh size of the screen cloth, it is important to have insight into the particle size distribution of the suspended solids in the water.