GreenForze - Wastewater Treatment

Wastewater Treatment

The Mainstream Approach
The traditional Waste Water Treatment is based on the following principles:

- Biological hygienisation by way of anaerobic digestion

- Production of Heat and/or Power from the biogas

- Mechanical dewatering of digested sludge (20-25% ds)

- Spread on Landfill, Agriculture or Incinerated

This approach is far from trouble free and includes the following issues:

- Odour

- Health scares

- Changes in legislation (no sludge to landfill)

- Increased capital employed

- Challenges on running cost

- Need to demonstrate sustainable route for sludge

Our Novel Approach
- Chemical hygienisation treatment (pH4) of the raw sewage sludge, eliminating ecoli, salmonella and 98% of drug residues and also improving the dewatering process

- Mechanical dewatering of sludge to 40-50% ts

- Thermal Drying (in some areas of this process could be partly sun energy)

- Heat and/or power production, alternatively pyrolises and BioChar production

- Ashes to be used for soil improvement.

Benefits:
- Considerably lower investments and running cost
- Environmental and energy efficiency
- Lower carbon footprint
- Double or more exergy output
- Loss of non-sustainable sludge route
- Easier to comply with new regulations
- No heat needed for hygienisation

Step 1: Chemical Hygienisation Treatment
- After simple mechanical treatment in two stages - screens and sand traps - the raw sludge is chemically treated s.c. Direct Precipitation and thereafter a sedimentation step,
where the primary sludge is diverted at 4-6% ds and chemically treated before mechanical
dewatering.

- Environmental friendly Swedish patented method, used at water works in the centre of Stockholm city

- Removes 90% of Phosphorus and 25% of Nitrogen, which makes the water excellent for the irrigation of energy forests

- Improves mechanical drying with >50%

- Higher hygienisation than thermal treatment.

Step 2: Mechanical De-watering
- "New" application of an "old" and patented Press System for Sludge De-watering

- Press system widely used in the food industry for the production of fruit and vegetable juices

- 2,200 machines working worldwide in a unsupervised continuous operation way

- The already hygienised water could be used for irrigation as is or filtered for use as potable water.

Step 3: Drying
Depending on the chosen strategy the matter could be dried to below 10% moisture content with new patented Swedish low temperature (70 C) technology.

Step 4: Production of Heat and Power
The last step in the process is to use the treated raw sewage sludge for the production of power and heat or heat only. This could typically be achieved via traditional boiler/steam route or gasification/combustion. Alternatively, a pyrolises process could produce BioChar for soil improvement and also act as carbon sink and at the same time produce power/heat to run the water works.

Step 5: Phosphorous Recovery
A final step would be to recover Phosphorous from the ashes. A Swedish company has developed a very cost efficient method for wet chemically recovery - Phosphorous precipitation. The recovered Calcium Phosphorous could either be used in the production of a fertilizer or further refined into phosphoric acid.

For more information on our Wastewater Treatment Concept, please fill in this form in the below or call Tomas Persson on +44 (0) 7549 95 93 94

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