Search results
Results From The WOW.Com Content Network
Maintaining optimal pH is important for the removal of phosphorus from water. Phosphorus is most effectively removed at the neutral pH range, when the insoluble aluminum hydroxide is present. This hydroxide functions as a Lewis acid, [5] creating a flocculation environment similar to conventional wastewater treatment.
Agricultural wastewater treatment is a farm management agenda for controlling pollution from confined animal operations and from surface runoff that may be contaminated by chemicals in fertilizer, pesticides, animal slurry, crop residues or irrigation water. Agricultural wastewater treatment is required for continuous confined animal operations ...
In the case of phosphorus in particular, reuse of excreta is one known method to recover phosphorus to mitigate the looming shortage (also known as "peak phosphorus") of economical mined phosphorus. Mined phosphorus is a limited resource that is being used up for fertilizer production at an ever-increasing rate, which is threatening worldwide ...
Enhanced biological phosphorus removal (EBPR) is a sewage treatment configuration applied to activated sludge systems for the removal of phosphate. [ 1 ] The common element in EBPR implementations is the presence of an anaerobic tank ( nitrate and oxygen are absent) prior to the aeration tank.
The most studied example of this phenomenon is in polyphosphate-accumulating bacteria (PAB) found in a type of wastewater processing known as enhanced biological phosphorus removal (EBPR), however phosphate hyperaccumulation has been found to occur in other conditions such as soil and marine environments, as well as in non-bacterial organisms ...
A nutrient cycle (or ecological recycling) is the movement and exchange of inorganic and organic matter back into the production of matter. Energy flow is a unidirectional and noncyclic pathway, whereas the movement of mineral nutrients is cyclic.
Agricultural fields may need to be fertilised to make up for the phosphorus that has been removed in the crop. [83] When phosphorus does form solubilised ions of H 2 PO 4 −, if not taken up by plant roots these ions rapidly form insoluble calcium phosphates or hydrous oxides of iron and aluminum. Phosphorus is largely immobile in the soil and ...
The Nitrophosphate Process. Step 1. Nitrophosphates are made by acidiculating phosphate rock with nitric acid. Nitric acid + Phosphate rock → Phosphoric acid + Calcium sulphate + hexafluorosilicic acid. Ca 5 F(PO 4) 3 + 10 HNO 3 →6 H 3 PO 4 + 5 Ca(NO 3) 2 + HF; 6 HF + SiO 2 →H 2 SiF 6 + 2 H 2 O; Step 2. Removal of Calcium Nitrate.