Immersion type reaction assembly for nitrogen recovery of high-ammonia-nitrogen-content wastewater and recovery method

Abstract

The invention belongs to the technical field of sewage resourceful treatment, and particularly relates to an immersion type reaction assembly for nitrogen recovery of high-ammonia-nitrogen-content wastewater and a recovery method. The reaction assembly comprises a hydrophobic membrane pipe with openings in the two ends and a reaction frame used for fixing the hydrophobic membrane pipe, the reaction frame comprises two symmetrically-arranged end plates, the two end plates are connected through a connecting frame, a plurality of through holes are formed in the end plates, connecting cavities areformed in the outer sides of the two end plates, thin pipes are arranged on the connecting cavities, the thin pipes are communicated with the interiors of the cavities, and the two ends of the hydrophobic membrane pipe are fixed in the through holes of the two end plates respectively. The reaction assembly does not need to add chemicals, air (or CO2 gas) micro-aeration is used for improving the pH value of wastewater, rapid recovery of ammonia nitrogen in livestock and poultry manure wastewater under normal pressure is achieved, the risk of membrane pollution is avoided, and the recovered nitrogen element exists in the form of liquid ammonium salt and can be directly recycled.

Description

technical field [0001] The invention belongs to the technical field of sewage resource treatment, and in particular relates to an immersion reaction component and a recovery method for nitrogen recovery from waste water with high ammonia nitrogen content. Background technique [0002] Nitrogen recovery from wastewater is an important component of high value-added development and treatment of wastewater. Nitrogen recovery from wastewater is mainly through corresponding technical measures to recycle the nitrogen resources of wastewater to obtain high value-added economic benefits, which are used to make up for the energy generated in the wastewater treatment process. and material consumption costs. The nitrogen recovery of waste water in the prior art mainly includes the following methods: (1) struvite precipitation method: struvite precipitation method recovers nitrogen and phosphorus in sewage, which is a new type of nitrogen and phosphorus with good treatment effect gradual...

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Problems solved by technology

[0003] However, the method for wastewater nitrogen recovery in the above-mentioned prior art has the following disadvantages: (1) The ratio of nitrogen and phosphate in the wastewater is unbalanced, and nitrogen and phosphorus are recovered by struvite precipitation method, and magnesium salt and its hydrate usually need to be added as magnesium source , add phosphate and its hydrate as phosphorus source, adjust Mg 2+ , NH 4 + 、PO 4 3- Ion ratio realizes nitrogen recovery, the process is more complicated, the dosage of reagents increases with the increase of nitrogen and phosphorus concentration in wastewater, and the cost is not easy to control. In addition, additional anions and cations are added with the reagents, for the subsequent treatment or utilization of the liquid phase part of wastewater after nitrogen recovery possible adverse effects

(2) The following problems still exist in the recovery of wastewater nutrients by the membrane concentration method: 1. Membrane fouling is the bottleneck of technological development. How to control membrane fouling so that the membrane can run continuously for a long time and prevent frequent chemical cleaning and replacement of the membrane has become a current issue. Membrane treatment of wastewater is an extremely urgent problem

(3) The adsorption / desorption method has the problem of adsorption efficiency, and it is necessary to develop high-efficiency and low-cost adsorption materials. In addition, the regeneration of the adsorbate after adsorption saturation or the problem of how to reuse nitrogen will also further increase costs and nitrogen losses. possibility of

(4) The process of biological absorption is highly dependent on natural conditions such as light and temperature, so the recovery efficiency is limited; the realization of biological absorption of nitrogen and phosphorus often requires subsequent further treatment; in addition, algae also have strong resistance to many heavy metals Bioaccumulation capacity, the presence of heavy metals will affect the economic development of algal cells

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