Washing method of film used in leachate treatment process

A treatment process and leachate technology, applied in special treatment targets, sustainable biological treatment, chemical instruments and methods, etc., can solve the problems of easy re-clogging of membranes for cleaning, long cleaning time, and shortened cleaning cycles, and achieve effective sterilization. and dirt removal, bacterial inhibition and chelation, excellent wetting and detergency

Active Publication Date: 2017-10-20
GUANGZHOU HUANTOU ENVIRONMENTAL SERVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for cleaning complex and changeable membrane pollutants in actual operation, as well as the characteristics of different membrane types, it is difficult for membrane chemical cleaning agents to deal with complex and changeable pollution problems based on the actual operation of landfill leachate treatment plants, and the applicability is small , and the existing cleaning method fails to thoroughly clean the pollutants on the surface of the membrane. There is a long cleaning time, and the flux decays quickly after cleaning. The separation effect becomes worse, the operating pressure of the equipment rises for a short time, the membrane is easy to clog again and cleaning is difficult, the processing capacity is significantly reduced and the cleaning cycle is shortened.

Method used

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  • Washing method of film used in leachate treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] 1. Prepare cleaning solution:

[0062] (1) Pre-wash alkaline cleaning solution: inject 200L of reverse osmosis product water into the reverse osmosis chemical cleaning tank, then add 5-7L of 50% NaOH solution and 500g fatty alcohol polyoxyethylene ether to supplement the reverse osmosis product water Put the volume in the reverse osmosis chemical cleaning tank to 500L, stir evenly, measure the pH value, if the pH value is less than 11.5-12.0, add NaOH solution to make the pH value of the cleaning solution 11.5-12.0, and use the bag filter on the reverse osmosis machine filter.

[0063] (2) Alkaline cleaning solution: Dissolve 5kg of tetrasodium ethylenediaminetetraacetic acid, 5kg of sodium tripolyphosphate and 5g of sodium polyacrylate in 20L of reverse osmosis product water in the dissolving tank, and then add about 200L of reverse osmosis Produce water in the reverse osmosis chemical cleaning tank. Finally, add 5-7L of NaOH solution with a concentration of 50% and ...

Embodiment 2

[0078] Example 2 - when the reverse osmosis membrane is subject to class A pollution:

[0079] There is a problem in the No. 4 reverse osmosis unit (RO4) of the leachate treatment plant of the domestic waste landfill site: the conductivity of the product water and the pressure of the main pipe continue to rise, the conductivity of the product water is 1006us / cm, the pressure of the main pipe is 40.0bar, and the pressure of the branch pipe is 44.5 bar; The clean water recovery rate keeps decreasing, the clean water output drops from 10.7t / h to 9.4t / h, and the clean water recovery rate is 74.0%, the data shows that the membrane is seriously clogged.

[0080] (1) Shut down and rinse once and wash once with water to clean the residual sewage during operation;

[0081](2) Use a pre-washing alkaline cleaning solution for preliminary cleaning, and circulate the cleaning for 30 minutes to wash out the loose inorganic dirt and microorganisms on the surface of the membrane. This step is...

Embodiment 3

[0085] Example 3 - when the reverse osmosis membrane is subject to C pollution:

[0086] Membrane plugging occurred in No. 5 reverse osmosis unit (RO5) of the leachate treatment plant of domestic waste landfill: the pressure of the main pipe continued to rise to 41.0 bar, and the pressure of the branch pipe rose to 44.5 bar; the recovery rate of clean water continued to decrease to 72.8%. The output of clear water has dropped from 10.1t / h to 9.1t / h, and the data shows that the membrane has been severely clogged.

[0087] (1) Clean with acidic cleaning solution, cycle cleaning for 30 minutes, soak for 30 minutes, perform 2-5 times of cleaning and soaking operations; control the temperature at 38-40°C, monitor the pH value and color of the cleaning solution every 15 minutes , The degree of turbidity, when the cleaning solution is unqualified, add acid solution or replace it in time;

[0088] (2) Drain the cleaning solution after cleaning, rinse with reverse osmosis water until ...

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Abstract

A washing method of a film used in a leachate treatment process includes following steps: preparing a washing agent: (1), mixing NaOH, fatty alcohol polyoxyethylene ether and reverse osmosis generated water to obtain pre-washing alkaline washing liquid; (2), mixing sodium tripolyphosphate, sodium polyacrylate, NaOH, fatty alcohol polyoxyethylene ether, EDTA tetrasodium salt and reverse osmosis generated water to obtain alkaline washing liquid; (3), mixing sodium tripolyphosphate, sodium polyacrylate, sodium hypochlorite and reverse osmosis generated water to obtain washing-assistant alkaline washing liquid; (4), mixing sodium diethylhexyl sulfosuccinate, hydrochloric acid, citric acid, isothiazolinone and reverse osmosis generated water to obtain acidic washing liquid; judging type of the film: selecting at least two of the above washing liquids for permutation and combination, and washing the film sequentially according to a permutation and recombination sequence. The washing method realizes optimization grouping of different washing liquids and is convenient, simple, more thorough in washing, long in washing period and wider in application range.

Description

technical field [0001] The invention relates to the technical field of membrane separation water treatment, in particular to a membrane cleaning method used in a leachate treatment process. Background technique [0002] Membrane bioreactor (MBR) + membrane advanced treatment is a commonly used landfill leachate treatment process. Due to the complex composition of leachate in sanitary landfills, the effluent treated by MBR is used as influent water for reverse osmosis. Higher, higher concentration of organic matter, higher microorganisms, higher content of calcium and magnesium ions, and higher salt content. During normal operation, the membrane in the reverse osmosis element will be polluted by inorganic salt scale, microorganisms, colloidal particles and insoluble organic substances; these pollutants are deposited on the surface of the membrane, resulting in the difference between the water flow rate of the membrane and the desalination rate of the system. Decline or worse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06C02F3/10C02F3/12
CPCB01D65/06B01D2321/02B01D2321/12B01D2321/162B01D2321/164C02F3/102C02F3/1268C02F2303/14Y02W10/10
Inventor 杨光兴杨一清黄龙辉陈炳森车柄恒熊启明黄进维张范茂贾宏林许刘成
Owner GUANGZHOU HUANTOU ENVIRONMENTAL SERVICES CO LTD
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