Algal bloom threatens water supply for 25 million in Seoul metropolitan area

By Park Sae-jin Posted : August 19, 2024, 16:53 Updated : August 20, 2024, 17:25
Yonhap Photo
Yonhap
SEOUL, August 19 (AJU PRESS) - The Ministry of Environment Monday issued an alert for algal bloom at Paldang Lake, the reservoir formed by Paldang Dam, located about 27 kilometers (16.7 miles) east of Seoul. The lake is the primary water source for 25 million residents of the capital and surrounding areas.

The bloom, driven by hot weather and nutrient runoff containing phosphorus and nitrogen from nearby hills, has led to excessive algal growth. Heavy rains have exacerbated the situation by washing these nutrients into the lake.

On Sunday, Seoul issued an algal bloom alert for three sections of the Han River, which flows through the city and empties into the West Sea, also known as the Yellow Sea. The rapid spread of algae in these areas was linked to reduced water discharge from the Paldang Dam and increased sunlight.

In response, the Han River Basin Environmental Office has enhanced water purification efforts at 18 facilities in the Paldang area by adding activated carbon and increasing the frequency of drinking water quality inspections from once to twice a week.
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