Toxic red sludge from a Hungarian alumina plant reached the Danube on Thursday and crews struggled to dilute it to protect the river from what the prime minister called an "unprecedented ecological catastrophe". Experts said damage beyond the borders of Hungary was unlikely to be great but the threat had to be monitored closely.
Tibor Dobson, a spokesman for Hungarian disaster crews, told Reuters there were sporadic fish deaths in the Raba and the Mosoni-Danube rivers. He said all fish had died in the smaller Marcal River, which was hit by the spill first. Crews were working to reduce the alkalinity of the spill, which poured out of the burst containment reservoir of an alumina plant on Monday and tore through local villages, killing four people and injuring over 150. Three are still missing.
The spill's alkaline content when it reached the Raba, the Mosoni-Danube and the Danube itself, was still around pH 9 - above the normal, harmless level of between 6 and 8. Fresh data from the water authority on national news agency MTI showed pH levels peaking at 9.65 in the Mosoni-Danube river at the city of Gyor. They were measured at 8.4 in the Danube.
Crews were puring hundreds of tonnes of plaster and acetic acid into the rivers to neutralise the alkalinity. In Gyor, a city in the north-west of Hungary where the Raba flows into the Mosoni-Danube, a Reuters reporter saw white froth on the river and many dead fish washed ashore. Philip Weller, executive secretary to the International Commission for the Protection of the Danube River (ICPDR), a Vienna-based UN body, said most damage was local. Prime Minister Viktor Orban visited Kolontar on Thursday and said there was no point in even removing the rubble from part of the village as it was impossible to live there again.
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