Low-cost waste water phosphorus fertilizer production technology

Abstract

The invention provides a low-cost waste water phosphorus fertilizer production technology, and belongs to the field of water pollution control and resource regeneration. A low-cost waste water phosphorus fertilizer production device is composed of four treatment units including a first-stage blowing stripping pond, a first-stage settlement pond, a second-stage blowing stripping reaction pond and a second-stage settlement pond. The technology includes the following steps that biogas slurry waste water from an anaerobic pool is firstly subjected to CO2 blowing stripping in the first-stage blowing stripping pond, and the blowing stripping pH value is controlled; then, the waste water enters the first-stage settlement pond in a self-flowing mode, and suspended organic matter, colloid and part of precipitates are separated and removed; outflow water of the first settlement pond enters the second blowing stripping reaction pond for deep aerated blowing stripping and magnesium ammonium phosphate (MgNH4PO4.6H2O) crystallization reaction, and the pH value of the reaction is controlled; the waste water enters the second-stage settlement pond in a self-flowing mode for gravity settling, solid and liquid are separated, and magnesium ammonium phosphate precipitates are recycled. The waste water phosphorus fertilizer production technology can greatly reduce the amount of alkali thrown during waste water magnesium ammonium phosphate production, and the content of impurities in the product is reduced. Meanwhile, the problem that water pumps, pipe accessories and other facilities scale is effectively solved.

Description

technical field [0001] The invention relates to a low-cost waste water phosphate fertilizer recovery process method, which belongs to the technical field of waste water treatment and resource utilization. Background technique [0002] Phosphorus discharged from domestic sewage and aquaculture wastewater is one of the main causes of water eutrophication, which has a serious negative impact on the quality of water environment and has become one of the major environmental problems at present. On the other hand, phosphorus is an indispensable nutrient element for all life forms, and it is also an important chemical raw material. Especially, the limited resources of phosphate rock in nature make it necessary to realize the recycling of phosphorus resources. Phosphorus recovery from wastewater is an important way to alleviate water pollution and phosphorus resource shortage. At present, the main process for phosphorus recovery from aquaculture wastewater biogas slurry, urban slud...

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Problems solved by technology

[0004] Aiming at the problems of livestock and poultry breeding wastewater biogas slurry, sludge anaerobic supernatant and other phosphorus-rich wastewater phosphorus recovery, a large amount of alkali needs to be added, the product has high impurity content, and facilities such as water pumps and pipe fittings are easy to scale. The invention provides A low-cost waste water phosphate fertilizer production process