PROFILE OF NITRATE CONCENTRATION IN GROUNDWATER IN WINONGO WATERSHED AREA OF YOGYAKARTA CITY, INDONESIA

A Juliani^[1]*, N H Hanifah¹, S Rahmawati¹, N I Wantoputri¹

¹Faculty of Civil Engineering and Planning, Universitas Islam Indonesia, Yogyakarta, Indonesia

Jl Kaliurang KM 14, 5 Yogyakarta, Indonesia. 55584

[1]^* Corresponding author: a[email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art50

ABSTRACT

The mostly occurring case of anthropogenic source for nitrate contamination in groundwater especially in developing countries is domestic sewage. Hence, many cases of the presence of nitrate in groundwater are always correlated with the poor quality of wastewater management system. Since 2008 Yogyakarta area in Indonesia has improved its wastewater management system which should also improve the groundwater quality. This paper will discuss the recent condition of groundwater quality in Yogyakarta City area which focused on nitrate and its association to contamination from sewage after the improvement of sewage management system. Chloride concentration was measured and its ratio to nitrate was calculated to examine this association. Analysis of 32 groundwater samples showed the range of nitrate-N concentration from 3.6 to 42.56 with average of 9.97 mg/L. Meanwhile, chloride concentration ranged from 15.82 to 35.85 with average of 23.79 mg/L. The ratio of N to Chloride exceeds 1 only at 1 sampling  to the same cluster. This indicates that the nitrate in groundwater in this study may not originated from domestic sewage. Hence, the effort to improve wastewater management systpoint. In addition, Hierarchical Cluster Analysis showed that nitrate and chloride did not belongem has given positive impact to groundwater quality.

Keywords: nitrate concentration, groundwater, watershed

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