Skip to Main Content
The results from our analysis are separated into two parts: enhancement of biogas production and predicting the energy consumption. After implementing three steps, which we called continuous improvement project (CIP), we obtained results to show the increase of biogas that can help to reduce active power for equipment in the aeration tank. First, by increasing TSS concentration of the sludge through thickening, the volume of gas generation has been increased from 876.55 m3/day (which is around 9.7% of the design) to 1,307.29 m3/day (14.5% of the design), as shown in Table 5 and Figure 3. In Figure 3, the solid line indicates average of volume gas generation before CIP while the dashed dotted line is the actual monthly gas production taken from the regional wastewater treatment plant after on-site process alteration. The results also show improvements in terms of pH, which is closer to the design, and the hydraulic retention time is shorter than before.
Table 5

Digester performance before and after CIP phase 1

ItemBefore CIP (2013)After CIP (phase 1–2014)Design
Bio-gas generation (m3/day) 876.55 1,307.29 9,000 
Feed sludge volume (m3/day) 353.69 481.31 600 
Feed sludge density (%) 0.6 0.94 
Hydraulic retention time (day) 31.88 28.59 30 
Temperature (°C) 31 30 31 
pH 6.54 6.77 6.7–7 
Digester operation (unit) 
ItemBefore CIP (2013)After CIP (phase 1–2014)Design
Bio-gas generation (m3/day) 876.55 1,307.29 9,000 
Feed sludge volume (m3/day) 353.69 481.31 600 
Feed sludge density (%) 0.6 0.94 
Hydraulic retention time (day) 31.88 28.59 30 
Temperature (°C) 31 30 31 
pH 6.54 6.77 6.7–7 
Digester operation (unit) 
Figure 3

Enhancing gas generation under CIP.

Figure 3

Enhancing gas generation under CIP.

Close Modal

or Create an Account

Close Modal
Close Modal