RHEINISCHE BIOESTER - Anaerobic wastewater treatment in biodiesel production - Case Study
Some processes during the production of biodiesel, such as glycerine evaporation, fatty acid and methyl ester drying (vapour condensate), generate wastewater which is highly contaminated with organic substances. The most significant substances in the wastewater are glycerine, methanol and free fatty acids. EnviroChemie supplies biological wastewater treatment plants with biogas recovery for the production of bioenergy materials. As a result, our clients can purify their wastewater to the required quality while recovering energy-rich biogas which can be used to reduce energy costs.
Plant description
The wastewater concept is characterised by its small footprint, the excellent biomass retention, as well as low operating costs in tandem with simultaneous biogas production. Fluctuations in the quantity or pH value are compensated in the mixing and equalisation tank (MET) with an additional emergency volume. After adjusting the pH, the organic ingredients are hydrolysed to short-chain organic acids by special fermentative microorganisms. An inflow/outflow heat exchanger system ensures an optimal energy balance. Inside the patented Biomar® AHP reactor, the targeted process design causes an enhanced anaerobic, biological degradation of organic wastewater constituents through the formation of biogas, which is utilised in the steam boiler. The methanogenic biocenosis is inactivated in the aerobic activation downstream. Due to the programmable logic controller (PLC) with process visualisation, the entire system operates fully automatically and complies with all environmental requirements while offering low operating costs.
Performance data
- Throughput: 50 m³/day
- COD load: 4,000 kg/day
- COD concentration: < 80,000 mg/l
- COD degradation (anaerobic): > 95%
- Space requirements: 20 x 15 m
- Control system: PLC, process visualisation
- Methane reactor:
- Volume 2 x 200 m³
- Material Stainless steel, insulated
- Biogas yield: > 1,950 m³/day
- Outside temperature: -35 - + 40 °C
- Operating temperature: approx. + 35 °C
- Commissioning: 2006
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