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Method for directly detecting ammonia in wastewater by non-contact gas film diffusion-electric conductance

A gas film diffusion and non-contact technology, applied in the direction of material resistance, can solve the problems of environmental secondary pollution, long detection time of ammonia nitrogen in wastewater, harsh detection conditions, etc., and achieve long service life, convenient and reliable use, and wide detection range Effect

Inactive Publication Date: 2017-11-10
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a non-contact gas film diffusion-conductivity method for direct detection of ammonia nitrogen in wastewater, to solve the problem of long detection time of ammonia nitrogen in wastewater, complex substrates that must be distilled, and detection conditions in the prior art Harshness and technical problems that cause secondary pollution to the environment during the testing process

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  • Method for directly detecting ammonia in wastewater by non-contact gas film diffusion-electric conductance
  • Method for directly detecting ammonia in wastewater by non-contact gas film diffusion-electric conductance
  • Method for directly detecting ammonia in wastewater by non-contact gas film diffusion-electric conductance

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Embodiment 1

[0034] This embodiment discloses a method for non-contact gas film diffusion-conductivity detection of ammonia nitrogen in wastewater, using the "stop flow" dialysis mode, including the following steps: figure 1 , 3 As shown, 1) Turn on the peristaltic pump A, the sample solution 2 containing ammonia nitrogen is drawn into the quantitative loop 4 connected with the six-way valve 5 by the peristaltic pump A through the sample pipeline, and the excess sample solution 2 flows into the sample waste after filling the quantitative loop. In the liquid bottle 21; at the same time, the hydrochloric acid solution 1 with a concentration of 0.005mol / L is driven and sucked by the peristaltic pump A, and flows through the purifier 8, the receiving liquid channel 7.1 and the conductance channel in the membrane diffusion unit 7 successively through the receiving liquid pipeline. Detector device 6, the hydrochloric acid receiving liquid after coming out from the conductivity detecting device 6...

Embodiment 2

[0039] This embodiment discloses a method for non-contact gas film diffusion-conductivity detection of ammonia nitrogen in wastewater, using the "flow" dialysis mode, including the following operating steps: 1) Turn on the peristaltic pump A, and the sample solution 2 containing ammonia nitrogen passes through the sample pipeline from the peristaltic The pump A sucks into the quantitative loop 4 connected with the six-way valve 5, and the excess sample solution 2 flows into the sample waste liquid bottle 21 after the quantitative loop is filled; Drive and pull suction, through the receiving liquid pipeline, flow through the purifier 8, the receiving liquid channel 7.1 in the membrane diffusion unit 7 and the conductivity detector device 6 in sequence, and the hydrochloric acid receiving solution after coming out of the conductivity detection device 6 flows into the receiving liquid waste liquid In the bottle 11; after running continuously for 1 minute, the peristaltic pump A dr...

Embodiment 3

[0044] Spinning recovery sewage treatment: Quantitative loop is 100μL, sample solution flow rate is 1.5mL / min; receiving solution - 0.005mol / L hydrochloric acid, flow rate is 0.8mL / min, alkali solution - 0.5mol / L sodium hydroxide, flow rate is 1.0mL / min, the purifier is a cation exchange resin column. 38°C constant temperature, air film diffusion unit (serpentine diffusion cell with upper and lower symmetrical flow channels, hydrophobic membrane φ35mm, diffusion path about 25mm), the inlet of the sample solution is slightly higher than the outlet, and the inclination is 15°. The control program is started, the analysis is carried out automatically, and the automatic calculation shows that the measured ammonia nitrogen in the spinning recycled sewage is 13.82mg / L.

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Abstract

The invention discloses a method for directly detecting ammonia in wastewater by non-contact gas membrane diffusion-electric conductance. The method comprises the steps that a sample solution is sucked by a peristaltic pump A, a quantitative loop is filled with the sample solution, after a six-way valve is switched, a peristaltic pump B drives and sucks an alkaline solution to make the alkaline solution sufficiently mixed with the sample solution, ammonia in the sample solution is all transformed into ammonia gas, then the ammonia gas enters a sample solution cavity channel of a membrane diffusion unit, and a certain proportion of the ammonia gas is not in contact with a hydrophobic membrane, diffuses into a received solution cavity channel on the other side and turns into ammonium ions. Through a 'flow stop' or 'flowing' dialysis mode, a received solution which contains the ammonium ions enters the received solution cavity channel of the membrane diffusion unit and flows through a conductance cell, and an electrical conductivity detector directly measures the ammonia content according to the conductivity change of the solution. Compared with the prior art, the method has the advantages that the method has high selectivity, does not need distillation and color rendering, and is good in sample adaptability, wide in linearity range and long in service life of membranes, no toxic reagent is used, and the ammonia in sewage or recycled water can be directly determined within 5 minutes.

Description

technical field [0001] The invention relates to a method for detecting ammonia nitrogen content in waste water, in particular to a method for directly detecting the ammonia nitrogen content in waste water through non-contact gas film diffusion, resulting in a change in electrical conductivity. Background technique [0002] Ammonia nitrogen (NH 3 -N) is based on free ammonia (NH 3 ) or ammonium salt (NH 4 +) form exists in water and is one of the total control indicators of water quality pollutants in my country. There are many types of ammonia nitrogen determination methods, each with its own characteristics. Usually, the corresponding monitoring and analysis methods are selected according to the discharge properties of wastewater and the concentration of ammonia nitrogen. [0003] At present, the methods for determining ammonia nitrogen include Nessler colorimetric method, phenol-hypochlorite (or salicylic acid-hypochlorite) colorimetric method, electrode method, indophe...

Claims

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Application Information

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IPC IPC(8): G01N27/08
CPCG01N27/08
Inventor 陆克平黄劲松余世金
Owner CHINA PETROLEUM & CHEM CORP
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