A method and device for producing diammonium phosphate from wastewater containing nitrogen and phosphorus

Abstract

The invention discloses a method for producing diammonium phosphate with nitrogen and phosphorus containing wastewater. The method specifically includes: delivering the nitrogen and phosphorus containing wastewater produced in production of monoammonium phosphate to a diammonium phosphate exhaust scrubber to serve as lotion filling water to scrub and adsorb exhaust from a diammonium phosphate production plant; delivering diammonium phosphate exhaust scrubbing cyclic liquid to the scrubber to be mixed proportionally with concentrated phosphoric acid to adsorb dust and ammonia containing exhaust gas from the main line of the diammonium phosphate production plant; delivering the concentrated phosphoric acid and scrubber lotion to a tubular reactor reservoir to be mixed with acid to reach proportion and neutralization required by a diammonium-phosphate tubular reactor; feeding the mixed acid with appropriate proportion to the tubular reactor to react with liquid ammonia to generate slurry to be injected rapidly to a granulating machine layer for granulation. The diammonium phosphate product is produced by recycling the nitrogen and phosphorus containing wastewater generated from the diammonium phosphate production plant, annual recycling of P2O5 is 163 tons, annual recycling of nitrogen is 12 tons and annual increasing income is 610 thousand RMB Yuan according to consumption of nitrogen and phosphorus wastewater of 12 m<3> / hour.

Description

technical field [0001] The present invention relates to sewage treatment, and at the same time relates to the recycling and utilization of nitrogen and phosphorus resources. Specifically, the waste water containing nitrogen and phosphorus produced in the production process of monoammonium phosphate is recycled for diammonium phosphate lotion replenishment to produce diammonium phosphate products. way. Background technique [0002] In the process of producing monoammonium phosphate products by the slurry method, a large amount of wastewater containing nitrogen and phosphorus will be produced. The general treatment method is to transport the wastewater to the sewage treatment station for treatment and then discharge it up to the standard. The cost of environmental protection treatment is high, and the nitrogen in the wastewater , Phosphorus has not been effectively recycled, resulting in a large waste of resources. [0003] At the same time, in the process of producing diammo...

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Problems solved by technology

[0002] In the process of producing monoammonium phosphate products by the slurry method, a large amount of wastewater containing nitrogen and phosphorus will be produced. The general treatment method is to transport the wastewater to the sewage treatment station for treatment and then discharge it up to the standard. The cost of environmental protection treatment is high, and the nitrogen in the wastewater , Phosphorus has not been effectively recycled, resulting in a large waste of resources

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