n Risk Management - Septic tanks endanger groundwater : construction HSE&Q

Volume 2, Issue 8
  • ISSN : 1817-6585


Extracted from text ... 39 SEPTEMBER 2006 Risk Management C O N S T R U C T I O N Septic tanks endanger groundwater European research into nutrient contamination from septic tanks and other decentralised sewage treatment systems indicate that nitrogen and phosphorus releases act very differently in the underground environment. Nitrogen is retained in septic tanks only to a small extent. Once tank effl uent is infi ltrated into soil, it tends to be converted to nitrates, which become very mobile and move with underground water. Phosphorus, on the other hand, is signifi cantly retained in septic tanks (up to 48%) ..

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