BAM-forurening af drikkevandet - Skal vi rense? - De Økonomiske Råd

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6 Institut for Miljøvurdering BAM-forurening af drikkevandet December 2003 Den gennemførte spørgeskemaundersøgelse (se Kapitel 6.1.7) samt en tidligere udført un- dersøgelse af almene vandforsyningsanlæg som frem til 2001 har lukket boringer som følge af forurening med pesticider viser, at mange anlæg allerede har gennemført afværgetiltag. Dette understreger behovet for en hurtig politisk stillingtagen til, hvorledes BAM-problemet tackles på en økonomisk hensigtsmæssig måde.
Institut for Miljøvurdering BAM-forurening af drikkevandet December 2003 2 Abstract In Denmark almost the entire production of potable water is based on ground water. How- ever, Danish ground water resources are under pressure, especially from pollution with ni- trate and pesticides. The pesticide metabolite 2,6-dichlorobenzaminde (BAM) is the pesticide-related substance, which causes most problems for Danish waterworks. Thus, BAM has been detected in 22 % of water works boreholes, exceeding the drinking water quality criterion of 0,1 micrograms pr. litre in 7 %. According to current policy, ground water should only be subject to simple water treatment (i.e. oxygenation and sand filtration) before distribution to the consumers. Extended water treatment, e.g. active carbon filtration, is consequently only allowed when all other options to provide clean drinking water have failed. When waterworks have experienced serious pollution, this policy has often lead to massive investments in relocation of the affected ground water extraction sites. The purpose of this project is to examine, whether BAM is a case for deviation from current policy by applying extended water treatment, i.e. active carbon filtration. This is examined by reviewing the legal, technical and economic consequences of allowing extended drinking water treatment. The extend of ground water pollution is traditionally expressed as the percentage of affected boreholes. However, the current project has linked data from borehole analysis to the iden- tity of the waterworks that the boreholes belong to. Not counting boreholes polluted with substances not readily eliminated during active carbon filtration, it is estimated that more than 500 public waterworks (>10.000 m 3 pr. year) are affected by BAM, approximately 126 of these having problems with the quality criterion. Data also shows that approximately 80 % of the water works that have problems with the quality criterion, have such problems in more that 1/3 of their boreholes, making the need for serious preventive action imminent. The review of the relevant legislation and the limited Danish experience with active carbon filtration of ground water shows that there are neither legal nor technical reasons for not using active carbon filtration. The economic analysis shows that using active carbon filtration to solve the BAM-problem will be less expensive than relocation of ground water extraction sites, when there are no 7
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BAM-forurening af drikkevandet - Skal vi rense? - De Økonomiske Råd

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