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Treatment system and treatment method for preparing ammonium nitrate

A treatment system, ammonium nitrate technology, applied in ammonium nitrate fertilizer, water/sewage treatment, aerobic process treatment, etc., can solve problems such as retention, achieve stable effect, broad application prospects, and high reaction rate

Active Publication Date: 2020-09-25
TSINGHUA UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biological nitrification process requires the simultaneous action of ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB), which is very challenging in the environment of high ammonia concentration because the intermediate free nitrous acid (FNA) will Significantly inhibit the activity of NOB, causing the bioreactor to stay in the nitrosation stage (ammonia → nitrite)

Method used

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  • Treatment system and treatment method for preparing ammonium nitrate
  • Treatment system and treatment method for preparing ammonium nitrate
  • Treatment system and treatment method for preparing ammonium nitrate

Examples

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Embodiment 1

[0038] Such as figure 1 As shown, this embodiment provides a treatment system for preparing ammonium nitrate, including a bioreactor and a chemical reactor.

[0039] Wherein, the bioreactor is a sequence batch reactor (SBR) with a volume of 1.5L, including a water inlet 1, a water outlet 2, a peristaltic pump 3, a reaction chamber 4, a stirring paddle 5, a first aeration head 6 and The first aeration device 7 is provided with a peristaltic pump 3 at the water inlet 1 and the water outlet 2 . The reaction chamber 4 includes activated sludge inoculated with nitrosating bacteria, and the first aeration device 7 provides biological nitrosation reaction in the reaction chamber 4 through the first aeration head 6 arranged at the bottom of the reaction chamber 4. Oxygen, the stirring paddle 5 makes the activated sludge fully mix and contact with the wastewater containing ammonia nitrogen.

[0040] Among them, the chemical reactor includes a water inlet 8, a water outlet 9, a peristal...

Embodiment 2

[0043] The present embodiment provides a kind of method that adopts the processing system of embodiment 1 to prepare ammonium nitrate, and wherein feed is the urine that stays in storage pond for 3 days, specifically as follows:

[0044] Firstly, the urine is pumped into the reaction chamber of the SRB, aerated (dissolved oxygen concentration does not need to be controlled), so that the ammonia nitrogen in the urine undergoes a biological nitrosation reaction, and the residence time is 1 day, and then the effluent of the SBR (at this time The ratio of ammonia nitrogen to nitrite nitrogen is 1:1) pumped into the closed reaction chamber of the chemical reactor, and the initial pH of the solution is 3 by adding 1:9 hydrochloric acid (the concentration of free nitrous acid in the solution at this time is about 240HNO 2 -N / L), use dissolved oxygen electrodes and dissolved oxygen controllers to control pure oxygen intermittent aeration, so that the dissolved oxygen concentration in t...

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Abstract

The invention provides a treatment system and a treatment method for preparing ammonium nitrate. The treatment system comprises: a bioreactor which is used for preparing ammonium nitrite from ammonianitrogen through a biological nitrosation reaction; a chemical reactor which is used for preparing ammonium nitrate from ammonium nitrite through a chemical oxidation reaction, wherein a water outletof the bioreactor is connected to a water inlet of the chemical reactor. The invention provides a two-stage reaction system and method for preparing ammonium nitrate for the first time, and recyclingof wastewater containing high-concentration ammonia nitrogen is realized. The treatment system and method provided by the invention have the advantages of stable effect, automatic control, high reaction rate, no nitrogen loss or environmental risk and the like, and have very wide application prospects in the aspect of resource operation management of high-concentration ammonia-nitrogen-containingwastewater such as urine.

Description

technical field [0001] The invention relates to the technical field of ammonia nitrogen resource utilization, and more specifically, relates to a treatment system and method for preparing ammonium nitrate. Background technique [0002] Driven by the current energy-intensive nitrogen fertilizer production, more sustainable fertilizers are being developed to meet rapidly growing food demand. On the other hand, wastewater is increasingly being considered as a renewable resource for the recovery of nutrients, especially wastewater containing high concentrations of ammonia nitrogen is rich in nitrogen nutrients. For example, urine, which contributes about 80% of the total nitrogen in wastewater, but accounts for about 1% of the total wastewater. Therefore, the application of wastewater with high concentration of ammonia nitrogen as fertilizer in agriculture is a potentially sustainable option. Many agricultural productions in the world directly use urine as fertilizer, but due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C1/00C02F9/14C02F101/16
CPCC02F1/727C02F3/02C02F2101/16C02F2305/02C05C1/00
Inventor 刘艳臣左志强郑敏
Owner TSINGHUA UNIV
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