3. Case Study –Energy Neutrality at Bois-de–Bay WWTP in Genève, Switzerland
The Bois de Bay WWTP located in the Canton of Geneva in Switzerland, it was constructed in 2009
for 99,798 inhabitants*equivalent (inh*eq) and it is expected to grow up by 2020, for 130’000 inh*eq
[20]. The BB-WWTP has a biological treatment, which includes four tanks in parallel and eight sludge
settling tanks. The sludge treatment includes centrifugation to thicken the sludge before it is transported
by truck to another WWTP for further treatments before incineration. Therefore the sludge treatment
consumes only 10% of the total energy consumption While the biological treatment consumes the largest
amount of energy on the site (57%); 14 % is consumed by the deodorization of the buildings, mainly for
the pre-treatment building; 10% corresponds to the pre-treatment, 5% to the pumping system and 4% to
the final setting process [20]. It is important to mention that in Switzerland, there is a legal obligation to
incinerate the sludge and to dispose the ashes in a landfill. Furthermore, the electrical consumption in
2010 was 3.6GWh for a total volume of 8’178,227 m3 [20]. Under these conditions, the optimization of
the process was as follow: pre-treatment of sludge (Microsludge-MS), the integration of two anaerobic
digesters for biogas production (H2 and CH4), a biogas cogeneration system for heat and electricity
production, a drying system for the final amount of sludge after anaerobic digestion. The MS process is a
patented product designed for WWTPs to reduce sludge for disposal and enable the generation of
renewable energy and valuable bio-chemicals. It works by significantly enhancing the performance of
anaerobic digesters to convert sludge to biogas and to increase the capacity of existing infrastructure. The
MS process uses one or more high pressure homogenizers (cell disrupters) to pre-treat sludge prior to
anaerobic digestion, in addition it uses alkaline to weaken the cell membranes and reduce the viscosity. In
addition, an overall reduction in biosolids production of 50% can be achieved and biogas production will
rise up to 40%. The second main unit is an AD. For both processes the sludge most has a TS
3. Case Study –Energy Neutrality at Bois-de–Bay WWTP in Genève, Switzerland
The Bois de Bay WWTP located in the Canton of Geneva in Switzerland, it was constructed in 2009
for 99,798 inhabitants*equivalent (inh*eq) and it is expected to grow up by 2020, for 130’000 inh*eq
[20]. The BB-WWTP has a biological treatment, which includes four tanks in parallel and eight sludge
settling tanks. The sludge treatment includes centrifugation to thicken the sludge before it is transported
by truck to another WWTP for further treatments before incineration. Therefore the sludge treatment
consumes only 10% of the total energy consumption While the biological treatment consumes the largest
amount of energy on the site (57%); 14 % is consumed by the deodorization of the buildings, mainly for
the pre-treatment building; 10% corresponds to the pre-treatment, 5% to the pumping system and 4% to
the final setting process [20]. It is important to mention that in Switzerland, there is a legal obligation to
incinerate the sludge and to dispose the ashes in a landfill. Furthermore, the electrical consumption in
2010 was 3.6GWh for a total volume of 8’178,227 m3 [20]. Under these conditions, the optimization of
the process was as follow: pre-treatment of sludge (Microsludge-MS), the integration of two anaerobic
digesters for biogas production (H2 and CH4), a biogas cogeneration system for heat and electricity
production, a drying system for the final amount of sludge after anaerobic digestion. The MS process is a
patented product designed for WWTPs to reduce sludge for disposal and enable the generation of
renewable energy and valuable bio-chemicals. It works by significantly enhancing the performance of
anaerobic digesters to convert sludge to biogas and to increase the capacity of existing infrastructure. The
MS process uses one or more high pressure homogenizers (cell disrupters) to pre-treat sludge prior to
anaerobic digestion, in addition it uses alkaline to weaken the cell membranes and reduce the viscosity. In
addition, an overall reduction in biosolids production of 50% can be achieved and biogas production will
rise up to 40%. The second main unit is an AD. For both processes the sludge most has a TS
การแปล กรุณารอสักครู่..