FALENSIA, TALITA SAFA (2022) ANALISIS STATUS PENCEMARAN (KLORIN, FOSFAT, COD, BOD, DAN KELIMPAHAN FITOPLANKTON) DI SUNGAI BANJIR KANAL BARAT KOTA SEMARANG (22m550). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
Talita Safa Falensia. 26010118130082. Analisis Status Pencemaran (Klorin,
Fosfat, COD, BOD, dan Kelimpahan Fitoplankton) di Sungai Banjir Kanal Barat
Kota Semarang (Agus Hartoko dan Niniek Widyorini)
Sungai Banjir Kanal Barat berfungsi sebagai saluran drainase kota
Semarang yang meneruskan pembuangan air ke laut utara pulau Jawa. Lokasinya
yang strategis membuat sungai ini menjadi tempat pembuangan limbah kegiatan di
sekitarnya berpotensi menyebabkan penurunan kualitas air. Tujuan dari penelitian
ini adalah untuk mengetahui kualitas perairan berdasarkan baku mutu kelas II PP
No. 22 Tahun 2021, status mutu air berdasarkan nilai indeks pencemaran menurut
KEMENLH No. 115 Tahun 2003, dampak pandemi Covid-19 terhadap kualitas air
sungai, serta mengtahui kelimpahan jenis fitoplankton sebagai bio indikator
kualitas air. Penelitian dilaksanakan pada 24 Maret 2022. Metode penelitian
menggunakan metode survei dengan teknik penentuan lokasi sampling
menggunakan purposive sampling. Hasil penelitian menunjukan, status mutu air
Sungai Banjir Kanal Barat berdasarkan hasil perhitungan Indeks Pencemaran,
status mutu menunjukkan nilai 2,49 (tercemar ringan) dan berdasarkan
bakumutu air kelas II, temperatur, pH, klorin, COD masih memenuhi baku mutu,
sedangkan BOD, fosfat telah diatas baku mutu. Penelitian ini menujukan pandemi
memiliki dampak positif terhadap kualitas air dari tahun 2019 (fosfat : 0,115 mg/l ;
klorin : 0,035 mg/l ; COD : 54,762 mg/l ; BOD : 36 mg/l ; pH : 7,8 ; dan DO : 2,55
mg/l) hingga 2022 (fosfat : 0,061 mg/l ; klorin : 0,012 mg/l ; COD : 22,747 mg/l ;
BOD : 7,06 mg/l ; pH : 7,74 ; dan DO : 2,26 mg/l). Sebagai bio-indikator kualitas
air, rata-rata kelimpahan fitoplankton yang ada di sungai ini yaitu 1.641 ind/l.
Kelimpahan fitoplankton meningkat ke arah muara. Berdasarkan jumlah
kelimpahan tersebut sungai ini dikategorikan kategori oligotrofik (kelimpahan
fitoplankton rendah). Pada sungai ini ditemukan 19 genera yang dibagi dalam 5
kelas (Baccilariophyceae, Chlorophyceae, Cyanophyceae, Desmidiaceae, dan
Dinophyceae) dengan kelas yang dominan yaitu Bacillariophyceae, genus
Trichodesmium sp., hal ini menunjukan bahwa fitoplankton di sungai ini bersifat
edible dan non toxic bagi perairan.
Kata kunci: Indeks Pencemaran, Kelimpahan Fitoplankton, Status Pencemaran,
Sungai Banjir Kanal Barat

ABSTRACT
Talita Safa Falensia. 26010118130082. Analysis of Pollution Status (Chlorine,
Phosphate, COD, BOD, and Phytoplankton Abundance) in the West Flood Canal
River, Semarang City (Agus Hartoko and Niniek Widyorini)
Banjir Kanal Barat river serves as a drainage channel for the city of
Semarang which continues the discharge of water to the north sea of the island of
Java. Its strategic location makes this river a place for waste disposal from
activities in the vicinity which have the potential to cause a decrease in water
quality. The purpose of this study was to determine the water quality based on the
class II PP No. 22 of 2021, the status of water quality is based on the pollution
index value according to the Ministry of Environment No. 115 of 2003, the impact
of the Covid-19 pandemic on river water quality, as well as knowing the abundance
of phytoplankton types as bio indicators of water quality. The study was conducted
on March 24, 2022. The research method used a survey method with a sampling
location determination technique using purposive sampling. The results showed,
the water quality status of the West Flood Canal based on the results of the
Pollution Index calculation, the quality status showed a value of 2.49 (lightly
polluted) and based on the class II water quality standard, temperature, pH,
chlorine, COD still met the quality standard, while BOD, phosphate has been above
the quality standard. This study shows that the pandemic has had a positive impact
on water quality from 2019 (phosphate: 0.115 mg/l; chlorine: 0.035 mg/l; COD:
54,762 mg/l; BOD: 36 mg/l; pH: 7.8; and DO : 2.55 mg/l) until 2022 (phosphate :
0.061 mg/l ; chlorine : 0.012 mg/l ; COD : 22.747 mg/l ; BOD : 7.06 mg/l ; pH :
7.74 ; and DO : 2.26 mg/l). As a bio-indicator of water quality, the average
abundance of phytoplankton in this river is 1,641 ind/l. The abundance of
phytoplankton increases towards the estuary. Based on this abundance, the river is
categorized as oligotrophic (low abundance of phytoplankton). In this river, 19
genera were found which were divided into 5 classes (Baccilariophyceae,
Chlorophyceae, Cyanophyceae, Desmidiaceae, and Dinophyceae) with the
dominant class being Bacillariophyceae, genus Trichodesmium sp., this shows that
the phytoplankton in this river is edible and non-toxic to the waters. .
Keywords: Banjir Kanal Barat River, Phytoplankton Abundance, Pollution Index,
Pollution Status,

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