Phosphorus

About: Phosphorus is a research topic. Over the lifetime, 53120 publications have been published within this topic receiving 939731 citations. The topic is also known as: element 15 & P.

Enhanced biological phosphorus removal driven by short-chain fatty acids produced from waste activated sludge alkaline fermentation.

Abstract: This paper examines the feasibility of using alkaline fermentative short-chain fatty acids (SCFAs) as the carbon sources of enhanced biological phosphorus removal (EBPR) microorganisms. First, the released phosphorus was recovered from the SCFA-containing alkaline fermentation liquid by the formation of struvite precipitation, and 92.8% of the soluble ortho-phosphorus (SOP) could be recovered under conditions of Mg/P = 1.8 (mol/mol), pH 10.0, and a reaction time of 2 min. One reason for a Mg addition required in this study that was higher than the theoretical value was that the organic compounds consumed Mg. Then, two sequencing batch reactors (SBRs) were operated, respectively, with acetic acid and alkaline fermentative SCFAs as the carbon source of EBPR. The transformations of SOP, polyhydroxyalkanoates (PHAs), and glycogen and the removal of phosphorus were compared between two SBRs. It was observed that the phosphorus removal efficiency was around 98% with the fermentative SCFAs, and about 71% with ac...

The determination of nucleotide phosphorus with a stannous chloride-hydrazine sulphate reagent.

Abstract: Stabilization of stannous chloride as reducing agent for the analysis of phosphorus by the molybdenum blue method has been achieved by combining it with hydrazine sulphate. Application of the procedure to the determination of inorganic and nucleotide phosphorus is described. Colorimetric measurement of light absorption is made at 700 mμ, permitting a highly sensitive and accurate estimation of phosphorus.

Phosphorus Inputs and Vegetation Sensitivity in the Everglades

Abstract: The Everglades ecosystem apparently evolved under conditions of relatively low phosphorus inputs, mostly from direct rainfall, which contributed approxi­ mately 196 tonnes annually to the 500,000-ha freshwater marsh within the Water Conservation Areas and Everglades National Park. Phosphorus inputs to the Water Conservation Areas have increased nearly threefold (from 129 tonnes under predrainage conditions to 376 tonnes currently) due to inflows of agricultural runoff water. Everglades National Park appears to have experienced smaller increases in annual phosphorus input, from 88 tonnes predrainage to 89 tonnes currently. The spatial distribution of surface water phosphorus within Everglades marshes takes the form of gradients from high concentrations at or near inflow points to nearly nondetectable concentrations within interior marsh areas.

The Loss of Elements from Decomposing Litter

Abstract: The rates of loss of dry matter, phosphorus, magnesium, calcium, potassium, and sodium during decomposition of plant materials were studied in mature Eucalyptus obliqua (L'Herit.) forests in southeastern Australia. The loss of elements follows the order Na > K > Ca > Mg > P, and can be largely explained by the behavior of these elements in terms of both mobility within the living biomass and of leaching from the forest canopy. The difference with respect to phosphorus between the mobility series for E. obliqua litter and that for the litter of some Russian hardwoods suggests that the two plant systems differ also with respect to the cycling and mobility of phosphorus within the living biomass.