Model wastewater sludge gas production using engineering inputs. Review methane volume, energy, and solids reduction. Export clear results for design checks and client reports.
Enter plant data below. The calculator uses a single-page layout with a responsive multi-column input grid.
Assumption: sludge density is approximated at 1000 kg/m3 for solids loading estimates.
These sample cases help compare different sludge streams and digestion conditions.
| Case | Flow (m3/day) | TS (%) | VS (%) | VS Destroyed (%) | Yield (m3/kg) | CH4 (%) | Biogas (m3/day) | Methane (m3/day) | Usable Energy (kWh/day) |
|---|---|---|---|---|---|---|---|---|---|
| Primary Blend | 120 | 4.5 | 70 | 55 | 0.95 | 62 | 1,975.05 | 1,224.53 | 4,273.00 |
| Mixed Sludge | 85 | 3.8 | 68 | 50 | 0.90 | 60 | 988.38 | 593.03 | 2,069.37 |
| High Strength Feed | 150 | 5.2 | 72 | 58 | 1.00 | 64 | 3,257.28 | 2,084.66 | 7,274.42 |
Dry Solids (kg/day) = Sludge Flow (m3/day) × 1000 × Total Solids / 100
VS Fed (kg/day) = Dry Solids × Volatile Solids Fraction / 100
VS Destroyed (kg/day) = VS Fed × Destruction Efficiency / 100
Biogas (m3/day) = VS Destroyed × Specific Biogas Yield
Methane (m3/day) = Biogas × Methane Content / 100
Gross Energy (kWh/day) = Methane × Heating ValueUsable Energy (kWh/day) = Gross Energy × Recovery Efficiency / 100
These formulas provide planning-level values. Site temperature, retention time, feed variability, and digester health can change real gas production.
It estimates dry solids, volatile solids destruction, daily biogas, methane volume, methane mass, and both gross and usable energy from sludge digestion inputs.
Volatile solids represent the biodegradable portion of sludge. Gas production depends more on destroyed volatile solids than on total wet sludge flow alone.
Many planning studies use a range around 0.7 to 1.1 m3 per kg of volatile solids destroyed. Actual values depend on feed quality and digester performance.
Higher methane content raises the fuel value of the gas. The calculator converts methane volume into gross energy, then applies recovery efficiency for usable energy.
Operating days convert daily gas and energy outputs into annual values. This helps with budgeting, equipment planning, and yearly performance comparisons.
No. This tool is best for screening and preliminary design. Lab testing, plant history, and process monitoring are still needed for final decisions.
Real performance changes with retention time, temperature, toxic shocks, mixing, foaming, feed variability, instrument quality, and actual digester biology.
This page assumes sludge density near 1000 kg/m3. Very thick sludges may need a better density estimate for more accurate dry solids loading.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.