Case Study : Digested Sludge Dewatering at Biogas Plant
General Information
A biogas power generation plant.
At the construction of a new plant, KDS Dewatering system was installed. They chose KDS system because the demonstration test result were favourable and the running costs would be lower than other systems. Thank you very much.
The anaerobically digested sludge is reacted with polymer flocculant and dewatered with KDS system. The discharge cake is dried further and reused as fertiliser material.
| Facility | Biogas Plant |
|---|---|
| Wastewater/Sludge | Anaerobically digested sludge from food residue |
| KDS Products | KDS Dewatering System + Polymer Preparation System + Polyferric Sulphate Feeder |
| KDS Separator Model | Dewatering Pneumatic : SS-811DK 1.0mm |
| Power Consumption | Dewatering System : 1.75kW, Chemical Feeding System : 1.3kW (excluding pumps) |
| Installation | July, 2023 |
Operation Data
| Influent [mg/L] |
Filtrate [mg/L] |
|
|---|---|---|
| SS | 15,000 | 37 |
| BOD | 410 | 29 |
| COD | 4,400 | 190 |
| N-hex extract | 120 | 3.3 |
| SS Rcovery Rate | ||
|---|---|---|
| 99.8% | ||
| Discharge Cake Dryness | ||
| 25% |
Current Operation Capacity
| Flow Rate [m3/hr] |
Solids Content [%] |
Throughput [kgDS/hr] |
Powder Flocculant Dosage [mg/L of Influent] |
Operation Hours per Day |
|---|---|---|---|---|
| 2.7 | 2.5 | 68 | 750 | 8 hours |
Before & After
Customer Feedback
The assumed cake dryness at the design stage of the plant was 15%. However, since the demonstration operation, it has been higher than 25%. This contributes to reducing the power consumption of the sludge dryer installed in the next process. We are satisfied with the outcome.
The dosage of polymer flocculant has been reduced compared to when we started operating the plant.
Video
On video page, you can find various wastewater/sludge treatment with Kendensha products.
Please check!
