The Biobed® EGSB technology (Expanded Granular Sludge Bed) is an extremely compact, high performance anaerobic treatment process for industrial effluents using granular sludge.
Overview
Technology Features
- ultra high organic loading capacity (15 - 30kg COD/m3/day)
- low surface area requirements
- energy source from biogas production
- economical operation
- extremely small footprint
- patented triple-baffle internal settler
- highly settleable granular biomass
- no odor or noise emission
- proven reliability
Treatment Process
To prepare the industrial effluent for anaerobic treatment, the pH-value and the temperature of the raw wastewater are regulated in a pretreatment step in a conditioning tank. The liquid will also be mixed with recycled, treated anaerobic effluent from a recirculation step to attain a homogenous body. Nutrients are added if necessary to achieve optimal growth conditions for the anaerobic biomass in the Biobed® EGSB reactor.
In the following treatment step the conditioned wastewater is pumped at a constant, continuous flow to the tall and slender Biobed® EGSB reactor. A special influent distribution system guarantees equal distribution over the entire reactor surface area. The influent then passes a dense and expanded anaerobic granular biomass bed where the biological treatment takes place converting the COD load (Chemical Oxygen Demand) present in the wastewater into biogas.
At the reactor top patented three phase settlers, which are installed internally in the reactor, separate the treated water from the produced biogas. The biomass settles back to the reactor bottom while part of the treated effluent is recycled and returned to the conditioning tank for dilution.
Biogas is collected at the top of the reactor and is piped to a biogas treatment step. Under controlled conditions it can be burned in a biogas flare or alternatively serve as a source of energy for the production site.
Modular Package Plant
Biothane offers a cost-effective and practical pre-fabricated Biobed® Package Plant solution for relatively minor wastewater streams with fewer COD loads.
The Biobed® Package Plant consists of two modules:
- one Biobed® reactor (50m3 or 120m3) and
- one service module
The system is capable of treating COD loads of up to 1.000 kg/day per reactor module and a maximum flow of 480m3/day.
The container framed modules are compact and transportable and therefore suitable for temporary but also for long-term use. The plant can be extended to up to six reactors per service module when production increases and is applicable for a wide variety of wastewater streams. The extension of a package plant is fast, easy and economical as it is delivered complete on-site.