EFEKTIVITAS LAHAN BASAH BUATAN ALIRAN HORIZONTAL BAWAH PERMUKAAN DENGAN TANAMAN HIAS BAMBU AIR DAN IRIS KUNING DALAM MENYISIHKAN LOGAM BERAT BESI DAN MANGAN AIR SUMUR

Abstract

Groundwater in Gambut District, Banjar Regency, has a low pH level of around 4.24 and an iron (Fe) level of 416.52 mg / L and manganese (Mn) of 0.79 mg / L. This value is exceeding the quality standard determined by the Minister of Health No. 416 of 1990 concerning clean water quality requirements, namely 1.0 mg / L for Iron (Fe) and 0.5 mg / L for Manganese (Mn). This problem will cause health problems for the community if used continuously without any processing. Constructed wetland is a treatment method that can be done to overcome the problem of groundwater containing heavy metals that is easy, inexpensive, and effective in its application. In this study, Sub Surface Flow-Constructed Wetlands was used. Previous studies have shown Sub Surface Flow-Constructed Wetlands with a continuous system can remove Fe better than a batch system. In this study, two types of plants were used to reduce levels of heavy metals in water, namely water bamboo and yellow iris. This research will use a reactor 90 cm x 30 cm x 30 cm. Furthermore, the groundwater will flow on the reactor with a continuous horizontal subsurface flow. Effluent samples will be taken on days 2, 5 and 10. Water samples are tested in the laboratory to determine Fe concentrations (SNI 6989.4: 2009) and Mn concentrations (SNI 6989.5: 2009). The results showed that the removal efficiency of Fe in constructed wetlands with Equisetum hyemale and Iris pseudacorus plants was 99.90% and 99.73%, respectively. As for Mn on constructed wetlands with Equisetum hyemale and Iris pseudacorus plants respectively 95.00% and 95.45%. The greatest constructed wetland efficiency for Fe and Mn metals removal occurred at a residence time of 5 days while the lowest occurred at a residence time of 10 days.