Biowater Technology AS

Municipal: Blumenau, Brasil


Courtesy of Biowater Technology AS

The Challenge

The existing UASB reactor was not able to achieve the required >92% BOD removal, and the small existing footprint together with the proximity of residences, let the client choose the Biowater’s CMFF, after technical and economical evaluations of conventional solutions, like activated sludge and RBC. Biowater’s CMFF present the lowest net present value of all.

The Design

Foz de Blumenau decided for the CMFF because of its simplicity, high performance, lower maintenance required and lowest capex/opex. In addition, the process offers available area for future expansions of Garcia WWTP. The primary treatment carried out by the UASB reactors is responsible for 70% BOD removal, and the Biowater’s CMFF will increase this overall performance for > 92%, in terms of BOD. The CMFF is splited in two reactors in series. Final settling tank is used for final solids separation, followed by final hypochlorination before discharge to the Garcia River. The excess sludge is dewatered together with the anaerobic sludge from the UASB by centrifuges.


A turn key project was delivered, split in three different contracts for detaling process engineering, mechanical works, and biomedia. The operational results from the first operational month after the start-up, have shown more than 92% BOD and higher than 87% COD removal in average. The final suspended solids is lower than expected ( < 25 mg/l). Client is very satisfied with the plant, and is planning to increase its capacity in the next 2-3 years using the Biowater’s CMFF technology.

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