ABSTRAK
Untuk mengurangi penggunaan air bersih, IPA Karanggayam PDAM TirtamartaYogyakarta dapat menggunakan kembali air backwash sand filter. Karakteristikair backwash sand filter mengandung Fe sebesar 8,205 mg/L dan Mn sebesar2,682 mg/L. Manganese ore constructed wetland diajukan dalam penelitian iniuntuk penyisihan besi dan mangan. Penelitian menggunakan subsurfacehorizontal flow manganese ore constructed wetland dengan dimensi 120x60x40cm3, sistem batch, menggunakan tanaman Phragmites australis, dan variasi waktutinggal dari hari 1 - 5. Hasil yang diperoleh menunjukkan penyisihan kekeruhan,besi, mangan dan COD meningkat seiring bertambahnya waktu tinggal. Denganwaktu tinggal 1 hari, sistem ini menyisihkan kekeruhan, besi, mangan dan CODsebesar 70,97%; 91,95%; 83,16%; dan 55,22%. Kandungan besi pada tanamanPhragmites australis di akhir penelitian pada akar, daun dan batang yaitu 635,28mg/kg; 96,99 mg/kg dan 34,73 mg/kg. Kandungan mangan pada tanamanPhragmites australis di akhir penelitian pada daun, akar dan batang yaitu 26,30mg/kg; 22,87 mg/kg dan 6,15 mg/kg. Kandungan manganese ore murni terbesaradalah komponen pirolusit (MnO2) yaitu sebesar 90,68% kemudian setelahpenelitian berkurang menjadi 39,11%. Desain manganese ore constructed wetlandskala lapangan berukuran 26,4x11,7x1 m3 dengan debit 80 m3/hari. Setelahpengolahan dari manganese ore constructed wetland, air backwash sand filtertelah memenuhi standar baku mutu air bersih sehingga dapat dimanfaatkankembali.

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ABSTRACT
To reduce their fresh water consumption, IPA Karanggayam PDAM TirtamartaYogyakarta can reuse sand filter backwash water. The characteristic of sand filterbackwash water contains exceeded Fe 8,205 mg/L and Mn 2,682 mg/L.Manganese ore constructed wetland was proposed in this research for the removalof iron and manganese.This research used subsurface horizontal flow manganeseore constructed wetland with dimension is 120x60x40 cm3, batch system, usingPhragmites australis, and detention time from 1 day to 5 day. The result show thatthe removal of turbidity, iron, manganese and COD increased accordingly withthe increase of detention time. With the detention time at 1 day, the turbidity, iron,manganese, and COD removal were up to 70,97%; 91,95%; 83,16%; dan 55,22%in this system. In the end of the research, Phragmites australis root, leaves, andstem contains 635,28 mg/kg; 96,99 mg/kg and 34,73 mg/kg of iron. AlsoPhragmites australis leaves, root, and stem contains 26,30 mg/kg; 22,87 mg/kgand 6,15 mg/kg of manganese. The biggest component in manganese ore is MnO2(pyrolusit) up to 90,68% and decreased up to 39,11% in the end of the research.The design of manganese ore constructed wetland with dimension 26,4x11,7x1 m3and rate of flow 80 m3/hari. After the treatment of manganese ore constructedwetland, sand filter backwash water fulfilled the quality standard so can be reuse.