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Treatment method for city domestic waste percolate after being filtered by biochemistry film and concentrated

A municipal solid waste and treatment method technology, which is applied in the treatment field of municipal solid waste leachate after biochemical membrane filtration and concentration, can solve the problems of high operating costs, difficult regeneration, and high requirements for adsorbents

Inactive Publication Date: 2007-10-17
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Leachate biochemistry—membrane filtration concentrated solution volume is 1 / 6~1 / 8 of the original leachate, and the output is very large. The main treatment methods include coagulation sedimentation method, evaporation drying method and adsorption incineration method, among which coagulation sedimentation method It has the disadvantages of easy to produce secondary pollution and poor treatment effect; the evaporation drying method has high requirements for equipment, high operating costs, and complicated operation and management; the adsorption incineration method is widely used abroad, but it has high requirements for adsorbents. Select activated carbon
Activated carbon has poor mechanical strength and difficult regeneration, which limits the application of adsorption incineration
Therefore, whether the leachate concentrate can be properly treated depends on whether other suitable adsorbents other than activated carbon can be found or developed. At present, there is no relevant research on the treatment of leachate concentrate by other adsorbents. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 20ml of amino-modified composite functional adsorption resin NDA-88 into a jacketed glass adsorption column (Φ20×350mm). At room temperature (20-25°C), the leachate biochemical-nanofiltration concentrate is filtered through a filter membrane to remove suspended matter, and passed through the resin bed at a flow rate of 40mL / h, and the wastewater treatment capacity is 400mL / batch. Raw leachate concentrate COD Cr 5360mg / L, adsorbed water COD Cr 372mg / L, COD Cr The removal rate is 93.1%.

[0019] Use 30mL of 8% by weight NaOH aqueous solution and 50mL of water at a temperature of 60±2°C to desorb and regenerate the resin bed in sequence. The desorption flow rate is 20mL / h, COD Cr The desorption rate is 98%. The low-concentration desorption solution (about 60mL) flowing out later is used to prepare the next batch of desorption agent. The resin washing water can be discharged directly.

Embodiment 2

[0021] Each 20 mL of NDA-88 resin was loaded into three jacketed glass adsorption columns (Φ20×350 mm), which were three adsorption towers I, II and III. Take 400mL of brown wastewater for pretreatment, control the water temperature of the glass jacket at 20±1°C, pass the wastewater through the NDA-88 resin bed at a flow rate of 2BV / h, the treatment capacity is 400mL / batch, the adsorption water is light yellow, COD Cr down to 320mg / L. The effluent can reach the corresponding sewage discharge standard after neutralization. The adsorption of the resin can adopt the operation mode of double-tower series adsorption and single-tower desorption. Firstly, towers I and II are connected in series for downstream adsorption, tower I is used as the first column, and tower II is used as the tail column. At the same time, tower I performs downstream desorption, and such a cycle operation can ensure the continuous operation of the whole device.

[0022] The adsorbed NDA-88 resin is sequen...

Embodiment 3

[0024] Other operating conditions are the same as implementation example 1, and the solution liquid adsorption flow rate after leachate biochemical-nanofiltration concentration is increased by one time, passes through the resin bed layer with the flow rate of 80mL / h after pretreatment, and adsorption treatment effect is as follows: former leachate concentration Liquid COD Cr 4643mg / L, adsorbed water COD Cr 342mg / L, COD Cr The removal rate is 90.5%.

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Abstract

The invention discloses a method for processing of percolating liquid biochemical membrane for urban daily rubbish after filtering and concentration. The waste water is the concentration liquid trapped by the filtering membrane or reverse osmosis membrane in the rubbish percolating liquid processing. The processing steps contain: passing the pretreated concentrated percolating liquid through the apparatus filled with composite functional absorption resin in the 0.5-5BV / h flux at room temperature, which is followed by neutralization with alkali after water absorbed out and is then discharged, regenerating the above resin with NaOH solution with the desorption agent of 0.5-3.0BV / h. The volume of the concentrated desorption solution is around 1 / 100 of that of the original percolating liquid and the concentrated desorption solution is burnt, buried or comprehensively used while the diluted desorption solution can be circulated for preparing the next batch of desorption agent. The invention is capable of reducing the concentration of CODCr in the concentrated percolating liquid from 6000mg / L or so to 300mg / L or so and finally realizes amount-reduced and innocuous concentrated percolating liquid. The method is characterized in simple processing, big processing amount, and capable of compensating the shortcomings of the current processing techniques of the urban daily rubbish percolating liquid.

Description

technical field [0001] The invention relates to a treatment method of municipal solid waste leachate after biochemical membrane filtration and concentration, specifically, a method for adsorbing and treating the concentrated municipal solid waste leachate by using an amino-modified composite functional adsorption resin. Background technique [0002] At present, the main treatment method of municipal solid waste is sanitary landfill, and the landfill leachate produced in the process of sanitary landfill is an internationally recognized problem in the treatment. At present, the more advanced treatment technology is a combination process such as biochemical-membrane filtration. The general flow of the process is as follows: After the landfill leachate is biochemically treated, it is then treated by nanofiltration or reverse osmosis. After the membrane treatment, in addition to reaching the standard effluent, there is also a large amount of membrane intercepted liquid. The munici...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/66B01J20/22B01J20/30B01J20/34
Inventor 李爱民刘福强张龙樊健李正斌王津南张波卢宇飞龙超张全兴
Owner NANJING UNIV
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