Tri Yulianti
The retention basin at the Faculty of Engineering Gadjah Mada University was built as a flooding control into the Code river and improving the water quality. The water entering the basin, especially in the dry season, is characterized as greywater due to the dense settlements around the university. The purpose of this study was to determine the effectiveness of reaeration process using a Microbubble Generator (MBG) to increase DO, with the aim of this leading to an improved water quality. The MBG aerator with submersible pumps was installed at a depth of 40 cm from the water surface and placed in the middle of the pond. The aerator was permanently turned on. In situ monitoring of DO was carried out using a seri Lutron WA-2017SD DO meter. The increasing DO correlated with the changes of the surrounding weather which impact on water and air temperature. At the time of DO data collection, the water temperature ranged from 24.5oC - 27oC and the change in DO measured at the inlet and outlet of the reservoir was in the range 0.3 - 1.1 mg/l, with the DO directly surrounding the aerator reaching up to 2.4 mg/l from the inlet. With the DO increased, the concentration of pollutant organic loads can be reduced and the nitritation and nitratation processes has taken place properly so that it has reduced the pollutant load before the water enters the Code river.

Arif, K. 2019. Efek Microbubble Generator sebagai Aerator Terhadap Tingkat Oksigen Terlarut pada Embung Lembah UGM. Skripsi, Universitas Gadjah Mada.

Burgos, A.J., Lopez, J.S., Rodriguez, P.U. 2015. Aerated Ponds, Series: Secondary Treatments. (FS-BIO-011) Technology Fact Sheets for Effluent Treatment Plants on Textile Industry. Universidade Da Coruna.

Dahruji, dkk. 2017. Studi Pengolahan Limbah Usaha Mandiri Rumah Tangga dan Dampak Bagi Kesehatan di Wilayah Kenjeran. Jurnal Pengabdian Kepada Masyarakat. 1(1): 36 – 44. ISSN 2528-4967.

Deendarlianto, Budhijanto, W., Alva, E. T., Indarto, Anggita, G. W. I. 2015. The Implementation of a Developed Microbubble Generator on The Aerobic Wastewater Treatment, International Journal of Technology, 6, 924-930. DOI:10.14716/ijtech.v6i6.1696

DLH kota Yogyakarta. 2018. Kajian Beban Pencemaran Sungai

Code. Laporan Akhir. Pemerintah Kota Yogyakarta, Dinas Lingkungan Hidup. https://lingkunganhidup.jogjakota.go.id/page/index/kajian-beban-pencemaran-sungai.

Dionisi, D. 2017. Biological Wastewater Treatment Process. Mass and Heat Balances. CRC Press, Taylor and Francis Group.

Huhnke, C.R. 2018. Factors Affecting Minimum Dissolved Oxygen Concentration in Streams. Doctoral Thesis, Cleveland State University.

Metcalf & Eddy. 2003. Wastewater Engineering: Treatment and Reuse (Fourth-Edition). McGraw-Hill.

Muryanto, Suntoro, Totok, G., Prabang, S., Afid, N., & Nurisa, F. W. 2019. Distribution of Nitrate Household Waste and Groundwater Flow Direction Around Code River, Yogyakarta, Indonesia. Indonesian Journal of Geography, Vol. 51, No. 1, Pp. 54-61. http://dx.doi.org/10.22146/ijg.43420

Parmar, R. & Majumder, S. K. 2013. Microbubble Generation and Microbubble-Aided Transport Process Intensification – a-State-of-the-Art-Report. Chemical Engineering and Processing, 64:79-97.

Pemerintah Republik Indonesia. 2001. Peraturan Pemerintah No 82 Tahun 2001 Tentang Pengelolaan Kualitas Air dan Pengelolaan Pencemaran Air.

Tamura, I., Uehara, I., & Adachi, K. 2014. Developing a Micro-bubble Generator and Practical System for Purifying Contaminated Water, Studies in Science and Technology, 3, 1, 87-90.

Water Environment Federation. 2017. Municipal Resource Recovery Design Committee-Liquid Stream Fudamentals: Aeration Design. WSEC-2017-FS-024

Wiratni, B., Deendarlianto, Heppy, K., & Dodi, S. 2015. Enhancement of Aerobic Wastewater Treatment by the Application of Attached Growth Microorganisms and Microbubble Generator. Volume 7, Pp 1101 – 1109, International Journal of Technology. DOI:10.14716/ijtech.v6i7.1240.