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Combined purification treatment method for landfill leachate membrane separation system

A membrane separation system and landfill leachate technology are applied in the field of joint purification and treatment based on non-membrane method to reduce the yield of membrane concentrate, which can solve the problem that the combined process of membrane separation system influent pretreatment is less reported, and there is no solution to reduce membrane concentrate. Production problems, high operating pressure, etc., to achieve the effects of low cost, reduced pressure, and stable water quality

Active Publication Date: 2020-02-07
瀚蓝(福清)固废处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Does not solve the problem of reducing the yield of membrane concentrate
Moreover, the disclosed methods of using the concentrated solution all have the problems of high operating pressure and low water production rate, and the newly produced membrane concentrated solution still needs to be treated, and the cost is relatively high.
The advanced oxidation method can achieve efficient removal of organic pollutants, but the cost is high and the treatment volume is not large
[0017] It can be seen that in the prior art, there are many reports on the treatment of the concentrate after membrane separation, but there are few reports on the combined process of the influent pretreatment and effluent posttreatment of the membrane separation system.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Preparation of modified attapulgite

[0098] (1) Get 10kg of clean attapulgite and grind it in a grinder, pass through a 100-mesh sieve to obtain attapulgite powder particles; wash the obtained attapulgite powder with deionized water and add it to 1M hydrochloric acid solution Heating to 50°C, 100w power ultrasonic vibration treatment for 30min; suction filtration and separation to obtain attapulgite filter residue, washing with water until neutral, to obtain acidified attapulgite particles.

[0099] (2) Put the acidified attapulgite in a muffle furnace for calcination and activation treatment at 580° C. for 2 h, cool to room temperature, grind and pass through a 100-mesh sieve to obtain 7.8 kg of activated attapulgite.

Embodiment 2

[0101] Preparation of attapulgite modified by silane coupling agent

[0102] 0.2 kg of 3-ethoxysilyl-1-propylamine and 0.1 kg of trimethoxy (3-anilinopropyl) silane were dispersed in 3.5 L of 95% volume ethanol, and 1 kg of the activated Attapulgite was heated to reflux temperature and slowly stirred for 2 hours, cooled, filtered, the filter residue was washed with absolute ethanol, and dried at 90°C to obtain attapulgite modified with a silane coupling agent.

Embodiment 3

[0104] Preparation of silica magnetic microspheres

[0105] (1) Carry out acidification treatment with 0.1M hydrochloric acid solution of 1kg 30-50nm ferroferric oxide magnetic medium under ultrasonic condition for 30min, filter after acidification, wash with deionized water to neutrality; take 80kg dehydrated ethanol , 20kg of deionized water, 1.2kg of 25wt% ammonia water were placed in a stirring tank and mixed uniformly to obtain a premixed solution; 2kg of methyl orthosilicate and the above-mentioned nano-ferric iron tetroxide were added to the premixed solution, and stirred at room temperature for 3h After the reaction, the microspheres were separated, washed with deionized water until neutral, and dried in vacuum to obtain a silica magnetic microsphere preform; the ethanol solvent was recovered by distillation and used in the next step.

[0106] (2) repreparing 75 kg of the above-mentioned premix of the same components and proportions, and adding 1 kg of the above-mentio...

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PUM

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Abstract

The invention relates to a water inlet pretreatment and water outlet aftertreatment combined purification treatment method for a landfill leachate membrane separation process, wherein the water inletpretreatment at least comprises the following steps: preparing modified attapulgite with improved adsorption performance, carrying out impurity adsorption treatment on leachate, and treating water entering a membrane separation system by using a filter unit taking coated mesoporous silica particles as a filter medium; wherein the effluent post-treatment in the landfill leachate membrane separationprocess comprises the step of purifying membrane filtration effluent by taking silicon dioxide magnetic microspheres as an adsorption medium in an electromagnetic purification tank. The combined treatment method disclosed by the invention is relatively low in preparation and operation cost and simple to operate and implement; by means of efficient adsorption of refractory organic matters, the defects that a membrane is easy to block and the membrane flux is reduced quickly are overcome, the yield of a membrane concentrated solution is effectively reduced, and the effluent quality of the membrane separation system is improved.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to the field of landfill leachate treatment, and in particular to a combined purification treatment method based on a non-membrane method to reduce the output of membrane concentrate. Background technique [0002] Landfill leachate is refractory organic wastewater produced in the process of waste treatment. It has the characteristics of large changes in water quality, complex components, and high content of organic matter and ammonia nitrogen. The treatment of landfill leachate is a major problem in waste treatment. [0003] At present, in the existing technology, the process of biochemical treatment plus membrane separation treatment is generally used for the treatment of landfill leachate, and the treatment process of nanofiltration combined with reverse osmosis is usually used for membrane separation to ensure that the COD of the effluent meets the standard. Among them, biochemica...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/02B01J20/12B01J20/22B01J20/10B01J20/28B01J20/30C02F103/06
CPCB01J20/06B01J20/103B01J20/12B01J20/22B01J20/28009C02F1/001C02F1/281C02F1/44C02F1/5236C02F1/56C02F9/00C02F2103/06C02F2301/08
Inventor 陈忠勤黄春华陈当灏刘文明王晶张彬张世裕
Owner 瀚蓝(福清)固废处理有限公司
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