engleski

Effect of flow rate on performance efficiency of subsurface flow constructed wetland with trickling filter

Effective wastewater purification in subsurface constructed wetland must include adequate pre-treatment and ensure sufficient amount of dissolved oxygen. In the pilot scale, the subsurface constructed wetland (CW) consisted of the primary settlement tank and two serially assembled basins ; the trickling filter was added to ensure the decrease of the CW load. The estimated nominal flow was 0, 7 m3/day. The experiments were conducted using the wastewater from the municipal sewage canal of the city of Zagreb, with utilization of three different flows: 0, 72 (A), 1, 44 (B) and 2, 88 (C) m3/day. The efficiency of the purification influence was monitored over the period of three years (TSS, BOD5, COD, NH4-N, NO2-N, PO4-P, dissolved oxygen, temperature and pH). The experimental results showed the increase of the efficiency removal doubling the nominal flow from 0, 7 to 1, 44 m3/day, what could be related to the implementation of the trickling filter where high removal rates were achieved.

constructed wetland; flow; trickling filter; wastewater

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