System for rapidly recovering ammonia nitrogen in high ammonia nitrogen wastewater of livestock

Abstract

A system for rapidly recovering ammonia nitrogen in high ammonia nitrogen wastewater of livestock comprises an ammonia separating system and an ammonia recovering system, wherein the dissolving balance of ammonium nitrogen in wastewater is broken by biochemical action, and meanwhile, the wastewater collides with a hot water pipe in a spraying manner, and the ammonium nitrogen is released in an ammonia gas form in the alternate cooling and heating process; acid absorbing and fixed utilizing of the ammonia gas are realized through the ammonia recovering system. Therefore, the ammonia nitrogen content in the livestock wastewater can be rapidly decreased; the barrier in following biological treatment of the livestock wastewater is reduced. According to the system, the ammonia nitrogen removingrate is up to 90.86% and reaches national standard on nitrogen ammonia exhaust of livestock wastewater; moreover, the ammonia nitrogen recovery rate is 95% or higher, so that the ammonia nitrogen content in the livestock wastewater can be efficiently rapidly removed within short time, and the released ammonia nitrogen can be efficiently recovered. The system is low in construction cost, low in energy consumption, simple to operate, high in applicability, capable of comprehensively recovering ammonia nitrogen resource, free from pollution to surrounding environments, and continuous to run.

Description

technical field [0001] The invention belongs to the field of agricultural ecology and environmental protection. It involves rapid recovery of ammonia nitrogen in high ammonia nitrogen livestock and poultry wastewater. Background technique [0002] In recent years, with the continuous advancement of new urbanization and urban-rural integration construction, the rapid development of large-scale and intensive animal husbandry in my country, the output of livestock and poultry breeding waste has increased sharply, with an annual output of 3.8 billion tons, and its COD and ammonia nitrogen The emissions were 10.49 million tons and 580,000 tons respectively, accounting for 95% and 76% of agricultural pollution sources, and 45% and 25% of national pollution sources. Livestock and poultry breeding pollution has become the third largest source of pollution after industrial pollution and domestic pollution, and one of the main causes of non-point source pollution in rural China. " an...

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Problems solved by technology

[0003] The COD content in livestock and poultry breeding wastewater is 6000-10000 mg / L, the ammonia nitrogen content is 400-1500 mg / L, the turbidity is 3000-10000 NTU, and the total phosphorus content is 60-150 mg / L. Exceeding the national livestock and poultry wastewater discharge standards (GB18596-2001), high ammonia nitrogen is the core obstacle that leads to difficulties in biogas slurry treatment. Many livestock and poultry breeding enterprises are facing demolition or reconstruction, which has brought huge pressure to breeding enterprises and seriously hindered Sustainable development of livestock and poultry farming enterprises

There are many methods for treating livestock and poultry wastewater developed at present, but these methods are time-consuming, costly, less applicable, and cannot operate continuously, which brings great troubles to livestock and poultry farmers. For example, using air Ammonia nitrogen recovery by blowing off (Chinese patent application publication number: CN 106430244 A), this method requires continuous air blowing, high energy consumption, and needs to add deamination agents (such as chitosan, resin and other consumables), and the cost is relatively high , not suitable for large-scale breeding enterprises, and the air stripping method is easy to increase the CO in wastewater 2 content; high-efficiency membrane stack exchange liquid ammonia nitrogen in wastewater (Chinese patent application publication number: CN 202007171 U), in which the membrane is a consumable, has a service life, high cost, and is difficult to clean

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