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WASTEWATER LAGOONS POPLAR IRRIGATION EXPERIENCIES FROM HUNGARY

WASTEWATER LAGOONS POPLAR IRRIGATION EXPERIENCIES FROM HUNGARY. Osztoics András, Szabó Anita, Szilágyi Ferenc. SANITARY CONDITIONS IN HUNGARY. Water supply is over 9 8 % Sewerage is only 45 % No sewerage system in almost 3000 settlements

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WASTEWATER LAGOONS POPLAR IRRIGATION EXPERIENCIES FROM HUNGARY

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  1. WASTEWATER LAGOONS POPLAR IRRIGATION EXPERIENCIES FROM HUNGARY Osztoics András, Szabó Anita, Szilágyi Ferenc

  2. SANITARY CONDITIONS IN HUNGARY • Water supply is over 98 % • Sewerage is only 45 % • No sewerage system in almost 3000 settlements • Consequences: Deterioration of surface waters and shallow ground waters

  3. ECONOMIC SITUATION • Lack of capital • Reorganization of the economy • Privatization is almost complete • Launching to EU • Environmental protection is more important Consequence: There is a need for cheap and effective sewage treatment

  4. Emission standards in Hungary [mg/l]

  5. STRUCTURE of the system description Ponds Poplar irrigation General data Treatment data Examples Pictures

  6. STABILIZATION PONDS Existing ponds or constructed for treatment 2-7 ponds (typical 2-3) Capacity: 80 – 10 000 m3/d(typical: 200-300) Area: 1 – 10 ha Depth: 0.8 – 2.1 m Retention time: 26 – 130 d (typical 50-65) Number: some 10s Treated ww.: both communal and industrial

  7. Treatment data

  8. Special type: BMKO Bio-mechanical combined oxidation system 5 or 9 subsequent stabilization ponds in a circular arrangement

  9. 3 m deep inner pond alternatively aerated depth decreases outwards inner circle – organic material 2nd circle – org. mat and nutrients outer circle – nutrients Capacity: 600 – 2 000 m3/d Area: less than in other stabilization ponds Hydraulic load: 1.5 cm/d

  10. Treatment data

  11. Long term efficiency

  12. POPLAR IRRIGATION Rows of poplar trees along ditches Capacity: 40 – 10 000 m3/d Area: 6.4 – 123.6 Hydraulic load: 0.14 – 1.6 cm/d Number: more than 40 Treated ww.: both communal and industrial Drainage !!!

  13. Usual arrangement Furrow width: 2.20 m depth: 0.50 m distance: 1.80 m Slope: 1:2 Water depth: 30 cm Dist. of trees: 6.00 m

  14. Case study: Gyula poplar plantation capacity: 10 000 m3/d irrigation area: 123.6 ha total area: 145 ha mechanical, biological pretreatment aerobic and facultative ponds

  15. Case study: Zalakaros poplar plantation capacity: 1 000 m3/d irrigation area: 9 ha total area: 12 ha pretreatment: settler terraced

  16. CONCLUSIONS OF NATURAL TREATMENT SYSTEMS IN HUNGARY • Effective organic material removal, however • problems with nutrient removal • Large land requirements – we usually have it • Low investment and operation costs – because of low • land and labour cost • Little maintainance work – not always done

  17. CONCLUSION continued • Special Hungarian system – BMKO • Special Hungarian system – poplar irrigation • Better distribution would be good, but: • Limit values are strict sometimes • Economic supporting system is not appropriate • Little operational and design experience

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