Our Group provides a range of complete and complementary solutions from treatment to recovery and reuse that can be adapted to the needs of all types of municipal authorities. Multi-process solutions help to achieve an optimum cost/safety ratio for each municipal authority.
Solutions for treating and eliminating sludge safely
Stage 1: Sludge concentration
This stage consists in mechanically dehydrating the sludge until it is reduced to 15-30% dry matter.
The sludge extracted from the latest treatment facilities has a dry content of 20-50g per liter and, aside from subsequent treatment through wet oxidation, all other types of treatment require a higher dry content.
This concentration takes place either on a fixed unit in facilities serving over 3,000 population equivalents or on a mobile unit, which travels around between several rural plants.
The investment burden, which would be prohibitively expensive for any one of these authorities to bear on its own, can thus be shared.
Stage 2: Processing tailored to the end use to which the sludge is to be put
Liming, composting, solar or thermal drying may be recommended where sludge is intended for agricultural reuse or sent to landfill.
In the event of waste-to-energy conversion, sludge may be incinerated in a dedicated kiln or burnt together with household waste, either in an untreated state or after solar or thermal drying.
Final stage: End use
There are two possible options for agricultural reuse :
- spreading untreated or limed sludge based on a waste-driven process,
spreading dried or composted sludge based on a waste- or product -driven process.
The other end use for sludge is being sent to landfill.
Limed or dried sludge, sludge reduced to ash after co-incineration with household waste or after a specific type of incineration and the mineral sludge residues produced by wet oxidation may be sent to landfill.
Sludge sent to landfill allows energy to be recovered through its conversion into biogas.
Thanks to current research efforts, the mineral residues produced from the specific incineration of sludge and from wet oxidation treatment may soon be reused.
Solutions
- Biological Treatment
- Dewatering
- Wet air oxidation
- Incineration
- Thermal drying
- Liming
- Landfill facility
- Fertilizer
- Solar drying
- Composting
- Hashes recycling
- Agricultural recycling