Phosphorus removal from waste water by filter media: retention and estimated plant availability of sorbed phosphorus

• Autorzy: Johansson L. , Hylander L.
• Języki publikacji: EN

Abstrakty

EN

Phosphorus (P) is regarded as a limited resource and should be recycled in agriculture. Other reasons for recycling this nutrient are that excess P is hazard­ous to the environment and that cadmium (Cd) often is added when agriculture soils are fertilised with P. In Sweden, two major sources to P discharge in rural areas can be distinguished; waste water discharge from private households and agricultural runoff. This waste water is often poorly treated, if treated at all, and large amounts of P will reach different water bodies causing eutrophication. Actions must therefore be taken in order to prevent untreated waste water to reach the water bodies. Ecologically engineered waste water treatment facilities such as constructed wet-lands and infiltration plants are attractive for removing pollutants. These facilities can be designed to further improve the P retention by using reactive media which possess high capacity to retain large amounts of P. In order to recycle the P in plant production, the sorbed P must be plant available. Reactive media of natural as well as of anthropogenic origin, were tested with regard to their phosphorus retention capacity in batch experiment as well as in column experiment in the laboratory. Physical and chemical properties of the materials were performed to estimate the usage of the reactive media in waste water treatment plants. Chemical extractions were performed with methods used for estimating plant available P in order to obtain a first indication of the plant availability. This paper reports on the results obtained in the experiments described above for a low-cost and low-tech solution of waste water treatment in rural areas.

• Wydawca: -
• Czasopismo: Zeszyty Problemowe Postępów Nauk Rolniczych
• Rocznik: 1998
• Tom: 458
• Opis fizyczny: p.397-409,fig.,ref.

Twórcy

autor

Johansson L.

• Division of Land and Water Resources, Royal Institute of Technology, S-100 44 Stockholm, Sweden

autor

Hylander L.

• National Institute of Agro-Environmental Sciences NIAES, Kannondai, Tsukuba, Ibaraki 305, Japan

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