Data and process for modelling

Question 1

The cost of sludge handling, processing and disposal can be as high as?

Answer 1

50% of wastewater treatment costs.

Question 2

Through digesting sludge at WWTP:s, what can be done to it?

Answer 2

Volume can be reduced, odor problems diminished, and energy can be produced.

Question 3

In best case scenario the energy produced by the sludge can cover?

Answer 3

A large portion of the energy needed in WWTP operation.

Question 4

Integration of biogas technology to WWTP processes aids in?

Answer 4

Diminishing the total carbon footprint of the operation and contributes to the general improvement of energy efficiency in society.

Question 5

What are the two most popular digester models?

Answer 5

ADM1 and siegrist.

Question 6

What is the standard giobas production option?

Answer 6

Mesophilic anaerobic microbial methanogenesis at 35-38 C in an intermittent or mixed continuous (CSTR) process. It is called high-rate AD process.

Question 7

Thermophilic CSTR process at 55-57 C wins over mesophilic system by how?

Answer 7

• shorter retention time
• reduced need for a reactor volume due to improved biogas production
• Improved hygienisation and detoxification of the digestation

Question 8

What are the future prospects of biogas technology?

Answer 8

Use of models will continue and be emphasized, as the rising cost of energy sets demands on the efficiency of conventional as well as high-rate anaerobic digesters.

The sizing and operational protocols for new digesters will be optimized more carefully than in the past.