Development of constructed treatment wetlands in Czech Republic for five years term

conference paper

English

Constructed wetlands (CWs) are in Czech Republic considered an alternative treatment technologies to activation treatment process. CWs are based on natural and slow wastewater treatment (without electricity). Horizontally flow CWs are confronted in many cases with problems almost the whole Czech Republic. As well as, they are often accompanied by inadequate cleaning efficiency (low ammonia removal). At present, about 400 CWs are in operation in Czech Republic. Majority of them are designed with horizontal sub-surface flow, while vertical flow constructed wetland are still are operated in the semi-experimental stage. However the vertical flow CWs have shown very good treatment effect and they can become the better solution into practice. Research work in the last five year solved the most common problems in constructed treatment wetlands. Our results are new approaches and solutions of configuration. The treatment efficiency is comparable with other technological devices for wastewater treatment. The outlet concentration obtained in the constructed wetland for 230 PE in the Czech Republic achieves COD <20 mg l-1, BOD < 7 mg l-1, TSS < 6 mg l-1 N-NH4+ < 7 mg l-1 (ammonia nitrogen is slowly improved). These results are significantly lower than the legislative limits for < 500 PE: COD < 150 mg l-1, BOD < 40 mg l-1, SS < 50 mg l-1 (ammonium nitrogen is not required). New results from research in the field of septic tanks also show significantly higher efficiency in comparison with slotted sedimentation tanks: COD = 78%, BOD = 75%, SS = 94%. In the Czech Republic is newly used numerical simulation in the research works connected with constructed wetland. The numerical simulation is provided by using software HYDRUS CW2D. We use numerical models of the CWs that were calibrated and allow to get information about the output concentrations of wastewater emission, such as ammonia nitrogen (N-NH4+), chemical oxygen demand (COD) and phosphorus (Ptot). The differences between measured and simulated results are less than 10%. A new way to design a modern constructed treatment wetlands is simple - bring together all the results, new technologies and solutions in a single system. The main objective is to build a competitive solution constructed wetland, which remove not only previously presented and SS, but also N-NH4+, Ptot and Ntot.

Constructed treatment wetlands, vertical flow constructed wetland, COD, N-NH4+ , HYDRUS CW2D

NĚMCOVÁ, M.; KRIŠKA-DUNAJSKÝ, M.

30. 6. 2016

STEF92 Technology Ltd.

51 Alexander Malinov Blvd., 1712, Sofia, Bulgaria

978-619-7105-66-7

SGEM Conference Proceedingsc

Ecology, Economics, Education and Legislation

1

1314-2704

International multidisciplinary geoconference SGEM

16

2

Republic of Bulgaria

225

232

8