System Turns Sludge Into Biogas

May 14, 2019

TreaTech research has found a way to turn sludge from wastewater treatment plants into mineral salts and biogas

TreaTech developed a new system that has turned sludge from wastewater treatment plants into mineral salts and biogas. According to Phys.org, the TreaTech research is funded by multiple entities, and a pilot plant is now being built.

Previously, plant operators disposed of this sludge directly as fertilizer. However, it was made illegal in Switzerland more than 10 years ago due to the growing concentration of pollutants found in effluents, according to Phys.org. TreaTech's system also can produce biogas from the effluent with thermal gasification.

The sludge in the system is 95% water and is dehydrated by wastewater plants. According to Phys.org, the residue is incinerated elsewhere.

"Our system can recover sludge directly from wastewater treatment plants without any drying or other preliminary processing needed," said Frédéric Juillard, TreaTech CEO.

The effluent stream is fed into a high-pressure and high-temperature separator where the fluid enters a critical state. This lowers the solubility of phosphorus and mineral salts in the fluid, according to Phys.org. "Over 90% of phosphorus can be recuperated," Juillard said.

According to Phys.org, some wastewater treatment plants have systems for recycling sludge into biogas. The technology also saves a lot of time. According to Phys.org, the reactors can turn sludge into biogas in 20 minutes.

"But biodigesters they currently use can convert only 40 to 50% of the organic matter," said Gaël Peng, co-founder and CTO of TreaTech. “Sludge processing and disposal account for around 40% of a wastewater treatment plant's total operating costs.”

TreaTech also is currently building a pilot plant that can treat 100 kg/h of sludge. The plant should be completed by the end of 2019, and is scheduled to be installed at a wastewater treatment plant in 2022, according to Phys.org. The company wants to adapt the system for use in other applications, like treating industrial wastewater, biomass residue and wastewater from desalination plants.

Sponsored Recommendations

Blower Package Integration

March 20, 2024
See how an integrated blower package can save you time, money, and energy, in a wastewater treatment system. With package integration, you have a completely integrated blower ...

Strut Comparison Chart

March 12, 2024
Conduit support systems are an integral part of construction infrastructure. Compare steel, aluminum and fiberglass strut support systems.

Energy Efficient System Design for WWTPs

Feb. 7, 2024
System splitting with adaptive control reduces electrical, maintenance, and initial investment costs.

Blower Isentropic Efficiency Explained

Feb. 7, 2024
Learn more about isentropic efficiency and specific performance as they relate to blowers.