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Carbon-nitrogen separation treatment and nitrogen source recovery synchronous device for high-salt landfill leachate concentrated solution

A technology for separation and treatment of landfill leachate, applied in the field of carbon and nitrogen separation and simultaneous recovery of nitrogen source devices for high-salt landfill leachate concentrate, can solve problems such as increased operating costs, poor biodegradability, and reduced evaporation efficiency, and achieve operational High efficiency, small footprint, and the effect of improving oxidation capacity

Active Publication Date: 2021-06-04
上海交通大学重庆研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resulting leachate concentrate has become a bottleneck restricting the application of membrane technology due to its complex water quality, high salinity, and poor biodegradability.
As the concentrated liquid treatment method most used in actual engineering in my country, recharge can significantly remove organic matter and nitrogen pollutants, but it will cause the gradual accumulation of salt and heavy metals in the concentrated liquid, which will affect the normal biochemical treatment after entering the leachate treatment system The performance of microorganisms in the process leads to a vicious cycle, and a large number of high-salt, high-ammonia-nitrogen, and high-organic matter concentrates need to be solved urgently
[0003] For concentrates with high salt, high ammonia nitrogen, and high organic matter, the main treatment processes at this stage are: (1) Evaporation technology, which can effectively remove ammonia nitrogen and crystallized salt simultaneously, but high organic matter content will greatly reduce evaporation efficiency and increase operating costs , at the same time, the evaporator suffers from serious corrosion, and it is difficult to maintain stable operation
(2) Ion exchange technology can selectively enrich the organic matter, ammonia nitrogen and inorganic salt ions in the concentrated liquid, but the treatment of organic matter and heavy metals in the regeneration waste liquid is a difficult problem for ion exchange technology
(3) Backspray incineration technology is mainly used in the situation where the landfill is adjacent to the waste incineration facility. This process is simple to operate and requires less initial investment. It is suitable for occasions with low concentrate output and high waste calorific value, but it is different from evaporation technology. The same will also face acid corrosion and salt corrosion
[0004] Patent document CN111606457A discloses an ozone advanced oxidation treatment device and process for landfill leachate concentrate. By improving the contact between ozone and leachate, the utilization efficiency of ozone is improved. degradation, but the removal and conversion of ammonia nitrogen is not considered. Therefore, an advanced oxidation treatment device for leachate concentrate that can simultaneously solve the problems of high organic matter removal and ammonia nitrogen removal / recovery is needed

Method used

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  • Carbon-nitrogen separation treatment and nitrogen source recovery synchronous device for high-salt landfill leachate concentrated solution

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Comparison scheme
Effect test

Embodiment 1

[0050] A landfill leachate emergency device concentrate (COD Cr is 10500mg / L, ammonia nitrogen is 3850mg / L, conductivity is 80mS / cm), using such as figure 1 The process equipment shown is used for treatment, and the main process parameters are as follows: the treatment water volume is 5L, the diameter of the ozone oxidation stripping tower is 10cm, the height-to-diameter ratio is 8, the material of the microbubble aeration disc is titanium, the ozone concentration is 80mg / L, and the flow rate 1L / min, the agitator format is set to 4 straight-bladed turbine blades, the rotation speed is 25r / min, the leachate circulation flow rate is 5L / min, the pH is adjusted to 10.5 by automatic control, the reaction time is 120min, and the final effluent COD removal rate is 62.3%, nitrogen recovery rate can reach 70.5%.

Embodiment 2

[0052] A landfill leachate concentrate (COD Cr is 20000mg / L, ammonia nitrogen is 8000mg / L, and conductivity is 40mS / cm) as figure 1 The main process parameters are as follows: the treatment water volume is 5L, the diameter of the ozone oxidation stripping tower is 8cm, the height-to-diameter ratio is 10, the material of the microbubble aeration disc is titanium, the ozone concentration is 120mg / L, and the flow rate 0.5L / min, the format of the agitator is set to 6 folding blades, the rotation speed is 20r / min, the circulating flow rate of the leachate is 5L / min, the pH is adjusted to 10.5 by automatic control, the reaction time is 120min, and the final effluent COD removal rate The nitrogen recovery rate can reach 68.9%.

Embodiment 3

[0054] A landfill leachate concentrate (COD Cr 15000mg / L, ammonia nitrogen 10000mg / L, conductivity 55mS / cm) as figure 1 The main process parameters are as follows: the treatment water volume is 5L, the diameter of the ozone oxidation stripping tower is 6cm, the height-to-diameter ratio is 12, the material of the microbubble aeration disc is titanium, the ozone concentration is 100mg / L, and the flow rate 0.8L / min, the agitator format is set to 6 folded blades, the speed is 30r / min, the leachate circulation flow rate is 3L / min, the pH is adjusted to 10.5 by automatic control, the reaction time is 120min, and the final effluent COD removal rate The nitrogen recovery rate can reach 66.4%.

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Abstract

The invention provides a carbon-nitrogen separation treatment and nitrogen source recovery synchronous device for a high-salt landfill leachate concentrated solution. The device comprises an ozone oxidation stripping tower, and an automatic defoaming agent adding module, a leachate concentrated solution external circulation module and a negative pressure nitrogen source recovery module which are respectively connected with the ozone oxidation stripping tower, a first stirring device is arranged in the ozone oxidation stripping tower; a leachate concentrated solution spraying device is connected with the output end of the leachate concentrated solution external circulation module; a microbubble aeration disc is connected with an external ozone source; the input end of the leachate concentrated solution external circulation module is connected with the lower part of the ozone oxidation stripping tower, and the defoaming agent automatic adding module and the negative pressure nitrogen source recovery module are connected to the upper part of the ozone oxidation stripping tower. The device realizes carbon and nitrogen separation treatment and nitrogen source recovery of the leachate concentrated solution, has the advantages of high operation efficiency and small occupied area, and is an environment-friendly technology with a good development prospect.

Description

technical field [0001] The present invention relates to the field of environmental protection technology, in particular to processing equipment for landfill leachate, in particular to a carbon and nitrogen separation process for high-salt landfill leachate concentrate and synchronous recovery of nitrogen sources. Background technique [0002] The up-to-standard disposal of landfill leachate has become an important indicator for sanitary landfills at this stage, and the application of membrane technology in leachate treatment has effectively solved the problem of up-to-standard effluent ("Pollutant Control Standards for Domestic Waste Landfills" GB16889-2008) . However, the resulting leachate concentrate has become a bottleneck restricting the application of membrane technology due to its complex water quality, high salinity, and poor biodegradability. As the concentrated liquid treatment method that is most widely used in actual engineering in my country, recharge can signi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78C02F103/06C02F101/16C02F101/30
CPCC02F1/78C02F2201/007C02F2103/06C02F2101/16C02F2101/30C02F2209/08C02F2301/046
Inventor 楼紫阳王辉吴洺潘杰刘伟
Owner 上海交通大学重庆研究院