Dirgayanto, Camelia Fadhilah Putri and Dr. Ir. Umi Zakiyah, M.Si. (2024) Pemetaan Tingkat Pencemaran Air Menggunakan Metode Indeks Pencemaran (IP) Di Waduk Lahor Kabupaten Malang Jawa Timur. Sarjana thesis, Universitas Brawijaya.
Abstract
Waduk Lahor merupakan waduk yang berada di Kecamatan Sumberpucung, Kabupaten Malang, Jawa Timur. Pencemaran air yang terjadi di sekitar Waduk Lahor akan mempengaruhi kualitas air seperti sifat fisika, kimia, maupun biologi. Melihat permasalahan tersebut, perlu dilakukan upaya pengendalian dan pemantauan pencemaran air waduk di sekitar wilayah Waduk Lahor, sehingga nantinya dapat diketahui kondisi kualitas air yang ada di Waduk Lahor. Tujuan dilakukannya penelitian ini yaitu untuk mengetahui kualitas air yang ada di Waduk Lahor, kemudian mengetahui tingkat pencemaran yang terjadi di Waduk Lahor yang ditinjau berdasarkan parameter fisika kimia air serta biologis air dan sebaran tingkat pencemaran air di Waduk Lahor. Penelitian ini dilakukan pada bulan Juli hingga September 2023 dengan metode purposive sampling, dimana sampel air akan diambil pada 5 titik pengamatan dengan penggunaan lahan sekitar yang berbeda-beda. Parameter kualitas air yang diukur yakni suhu, kecerahan, pH, Dissolved Oxygen (DO), Chemical Oxygen Demand (COD), dan Biologycal Oxygen Demand (BOD). Penentuan tingkat pencemaran dilakukan menggunakan metode Indeks Pencemaran (IP) yang selanjutnya akan disajikan dalam bentuk peta menggunakan metode Inverse Distance Weighted (IDW) dari software Quantum GIS. Hasil perhitungan kualitas air di Waduk Lahor yakni suhu (25,1–26,80C), kecerahan (37–51 cm), pH (8–8,5), Dissolved Oxygen (DO) (5,22–6,35 mg/L), Chemical Oxygen Demand (COD) (19,12–21,63 mg/L), Biologycal Oxygen Demand (BOD) (8,91–9,27). Kualitas air kemudian ditinjau kembali menggunakan metode Indeks Pencemaran (IP) dan didapatkan hasil bahwa Waduk Lahor tergolong ke perairan tercemar ringan dengan nilai IP (2,50–2,63). Terdapat parameter kualitas air yang melampaui baku mutu air kelas II yakni (Biologycal Oxygen Demand) BOD. Untuk parameter biologis yakni plankton. Waduk Lahor termasuk ke dalam perairan mesotrofik (dengan kesuburan sedang). Berdasarkan komposisi plankton yang ditemukan yakni Genus Microcystis yang memiliki kelimpahan tertinggi di semua stasiun pengamatan. Kelimpahan Genus Microcystis di semua stasiun perlu diwaspadai, karena genus ini memiliki sifat toksin di perairan, sehingga menjadi tanda bahwa perairan Waduk Lahor berpotensi terjadi blooming algae. Waduk Lahor telah mengalami pencemaran bahan organik akibat dari aktivitas antropogenik di sekitar sungai. Berdasarkan hasil penelitian, dapat diberikan saran yakni perlu dilakukannya pengendalian pencemaran di sekitar waduk sehingga kualitas air waduk tetap dapat terjaga.
English Abstract
Lahor Reservoir is a reservoir located in Sumberpucung District, Malang Regency, East Java. The Lahor Reservoir is located approximately 32 kilometers south of the city of Malang towards the city of Blitar. Water pollution that occurs around the Lahor Reservoir will affect the quality of the exiting water and not only affect is physical, chemical and biological properties, but the organisms in it will also be affected. Seeing this problem, it is necessary to make efforts to control and monitor reservoir area, so that later the condition of the water quality in the Lahor Reservoir can be know. The purpose of this research is to determine the quality of the water in the Lahor Reservoir, then determine the level of pollution that occurs in the Lahor Reservoir which is reviewed based on the physical chemical and biological parameters of the water and the distribution of the level of water pollution in the Lahor Reservior. This research was conducted from July to September 2023 using a purposive sampling method, where water samples will be taken at 5 observation point with different uses of the surrounding land. The water quality parameter measured are physical parameters including temperature and brightness. Chemical parameters include pH, DO, COD and BOD. As well as biological parameters, namely plankton. Determination of pollution level is carried out using the Pollution Index (IP) method which will then be presented in map from using the Inverse Distance Weighted (IDW) method from Quantum GIS software. The results of water quality calculations in the Lahor Reservoir are temperature (25.1–26.80C), brightness (37–51 cm), pH (8–8.5), Dissolved Oxygen (DO) (5.22–6.35 mg /L), Chemical Oxygen Demand (COD) (19.12–21.63 mg/L), Biological Oxygen Demand (BOD) (8.91–9.27). The water quality was then reviewed using the Pollution Index (IP) method and the results showed that the Lahor Reservoir was classified as lightly polluted waters with an IP value of (2.50– 2.63). There are water quality parameters that exceed class II water quality standards, namely (Biological Oxygen Demand) BOD. For biological parameters, namely plankton. Lahor Reservoir is included in mesotrophic waters (with moderate fertility). Based on the plankton composition found, the Genus Microcystis had the highest abundance at all observation stations. You need to be careful about the abundance of the Microcystis genus at all stations, because this genus has toxic properties in the water, so it is a sign that the waters of the Lahor Reservoir have the potential for algae blooming. The Lahor Reservoir has experienced organic pollution due to anthropogenic activities around the river. Based on the research results, suggestions can be given, namely the need to control pollution around the reservoir so that the quality of the reservoir water can be maintained
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 052408 |
| Divisions: | Fakultas Perikanan dan Ilmu Kelautan > Manajemen Sumberdaya Perairan |
| Depositing User: | soegeng sugeng |
| Date Deposited: | 20 Aug 2024 04:03 |
| Last Modified: | 20 Aug 2024 04:03 |
| URI: | http://repository.ub.ac.id/id/eprint/224350 |
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