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��Home>>Life
Wuxi breathes easy, but water still undrinkable
www.chinanews.cn 2007-06-02 16:47:42
(Source: Xinhua)
June 2 - A team of water pollution experts have succeeded in dispelling
the unpleasant odor from the water supply of east China's Wuxi city, but
authorities say the water is still not safe to drink.
Domestic supplies would resume soon, but the city's 2 million residents
should continue to drink bottled water rather than risk the tap water,
which was polluted by an algae bloom in the main water source.
Wuxi Mayor Mao Xiaoping said a team led by Professor Zhang Xiaojian, of
Beijing's Tsinghua University, succeeded in dispelling the stench
produced by the blue-green algae at Taihu Lake with potassium
permanganate, an oxidant.
Workers also added active carbon powder at treatment plants.
"It took Professor Zhang and his team 17 hours of trials to reach the
right formula to eliminate the unpleasant odor," said Mao.
Residents have been told to run their taps to clean the pipes.
Wu Jianxuan, vice mayor of Wuxi, announced Friday that domestic tap water
rates would be reduced by half in June in compensation.
Both officials refused to give an exact date for the resumption of a
drinkable water supply.
Blue-green algae is an aquatic plant that occurs naturally in rivers,
lakes, damp soil, tree trunks, hot springs and snow. "Bloom" is the
common term used to describe an increase in the number of algal cells to
a point where they discolor the water, form scum, produce unpleasant
tastes and odors, affect shellfish and fish populations or otherwise
create a nuisance and seriously reduce water quality.
Experts blame three factors -- high temperatures, less rainfall and low
water levels, and abnormally high concentrations of phosphorus and
nitrogen in the lake water -- for the outbreak of blue-green algae bloom
in the Taihu Lake.
Since last Tuesday, many residents of Wuxi, have turned on their taps to
receive yellowish, stinking water.
The pollution led to a panic buying of bottled water and bread.
Local authorities are allocating more bottled water from neighboring
cities of Suzhou, Changzhou, Nanjing and Shanghai.
The city's pricing bureau has banned water price hikes. Vendors who
deliberately drive up prices face fines of up to 300,000 yuan (39,200
U.S. dollars).
The local meteorological observatory recorded an average temperature in
the Taihu Lake region of 17.1 degrees Celsius in the first five months,
0.7 degrees higher than previous years and the highest since 1955.
Rainmakers fired 39 rockets containing silver iodide from eight sites
around Taihu Lake on Thursday afternoon and Friday morning, inducing a
rainfall of more than 20 mm.
Meanwhile, the city government of Wuxi, 128 km northwest of Shanghai, has
opened a number of deep wells, which had been sealed off for fear of
excessive extraction, for use during the emergency.
Water authorities have also diverted the Yangtze River to dilute the lake
water, according to the Taihu Valley Administration under the Ministry of
Water Resources.
China has seen string of water pollution accidents, with more than 140
cases since 2005 when drinking water to millions of people in the
northeastern city of Harbin was stopped after a chemical spill
contaminated the Songhua River.
Among the top 10 environmental pollution cases listed by the State
Environmental Protection Administration (SEPA) last year, seven were
connected with water pollution, including four that directly led to
unsafe drinking water.
��Diversion of Yangtze River for water crisis
��
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