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United Kingdom, Poland, Pollution
Ornate organs
Ornate organs The German village of Cappel is home to one of the greatest historical music instruments. The ornate baroque organ here is the work of Arp Schnitger, the grand master of German organ construction who built it in around 1680 for Hamburg.
Purifying sludge through oxygen-based digestion
Purifying sludge through oxygen-based digestion Dealing with sludge is one of the biggest issues of waste water treatment.