阅读说明：本技术 一种用于dtro膜清洗剂及其制备和使用方法 (Cleaning agent for DTRO (draw texturing yarn) membrane and preparation and use methods thereof ) 是由 林峰 王洪晓 阎晓飞 于 2019-09-25 设计创作，主要内容包括：本发明属于污水处理剂领域,具体涉及一种膜清洗剂制备及其使用方法。针对现有用于垃圾渗滤液处理系统膜处理的膜受到硫污染,没有专门有效的膜清洗剂的问题,本发明提供一种膜清洗剂,其组成包括：按质量分数计,去离子水55%-60%,多聚磷酸盐3%-9%,螯合剂3%-6%,氢氧化钠20%,碳酸钠5%,十二烷基苯磺酸钠1%,小分子醇1%-3%和醇胺1%-3%,本发明的膜清洗剂适用于纳滤、微滤、RO、DTRO及SRO系统,可以有效清除有机无机复合污染物。(The invention belongs to the field of sewage treatment agents, and particularly relates to a preparation method and a use method of a membrane cleaning agent. Aiming at the problems that the membrane for membrane treatment of the existing landfill leachate treatment system is polluted by sulfur and no special effective membrane cleaning agent exists, the invention provides a membrane cleaning agent, which comprises the following components: the membrane cleaning agent is suitable for nanofiltration, microfiltration, RO, DTRO and SRO systems, and can effectively remove organic and inorganic composite pollutants.)

1. The membrane cleaning agent is characterized by comprising the following components: according to the mass fraction, 55-60% of deionized water, 3-9% of polyphosphate, 3-6% of chelating agent, 20-25% of sodium hydroxide, 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine.

2. The film cleaning agent according to claim 1, wherein: the chelating agent is at least one of EDTA-2Na or EDTA-4 Na.

3. The film cleaning agent according to claim 1, wherein: the small molecular alcohol is at least one of ethanol or isopropanol.

4. The film cleaning agent according to claim 1, wherein: the alcohol amine is at least one of monoethanolamine, diethanolamine or triethanolamine.

5. The film cleaning agent according to claim 1, wherein: the polyphosphate is at least one of sodium tripolyphosphate, sodium hexametaphosphate or potassium pyrophosphate.

6. The method for preparing a membrane cleaning agent according to claim 1, comprising the steps of:

Weighing 55-60% of deionized water in a reaction kettle, starting a stirrer, introducing cooling water into a jacket, adding 3-9% of polyphosphate, 3-6% of chelating agent and 20-25% of sodium hydroxide, stirring and dissolving completely at a temperature lower than 40 ℃, then sequentially adding 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine, stirring and dissolving completely, and thus obtaining the sodium dodecyl benzene sulfonate.

7. Use of the membrane cleaning agent according to claim 1, wherein: used for cleaning the membrane after filtering the landfill leachate.

8. Use of a membrane cleaning agent according to claim 6, characterized in that: the membrane comprises at least one of a nanofiltration membrane, a microfiltration membrane, a roll type reverse osmosis membrane, a disc tube type reverse osmosis membrane or a super reverse osmosis membrane.

Technical Field

The invention belongs to the field of sewage treatment agents, and particularly relates to a DTRO (draw texturing yarn) membrane cleaning agent and preparation and use methods thereof.

Background

The landfill leachate is high-concentration organic wastewater which has complex components and large water quality and water quantity change. The sources of the landfill leachate mainly comprise direct precipitation, surface runoff, surface irrigation, underground water, water of the garbage, water in a covering material and the garbageWater produced by biochemical reactions, and the like. The factors influencing the components of the landfill leachate mainly comprise: the garbage composition, the site climatic conditions, the hydrogeological rainfall conditions of the site, the landfill conditions, the landfill time and the like. The change of the water quality and the water quantity of the landfill leachate is large, and the change rule is complex. Chemical oxygen demand CODcr, biological oxygen demand BOD for five days₅The content of ammonia nitrogen is high, and along with the extension of landfill time, organic nitrogen in the rubbish is converted into inorganic nitrogen, and the mass concentration of ammonia nitrogen is increased. With the start of the pollution control standard of domestic refuse landfill (GB16889-2008), the traditional landfill leachate treatment adopts a single biochemical treatment method, which can not meet the water outlet requirement, and people turn the attention to a more efficient membrane separation technology. The membrane separation technology applied to the treatment of percolate mainly comprises ultrafiltration, nanofiltration, microfiltration, Reverse Osmosis (RO), a disc tube type reverse osmosis membrane (DTRO), a super reverse osmosis membrane (SRO) and the like, and most of percolate treatment adopts two or more than two membrane combination processes to ensure that the quality of effluent reaches the standard.

in the practical application process, the conditions of sulfur pollution besides common organic pollution, inorganic pollution and microbial pollution are found when nanofiltration, RO, DTRO and SRO are used for treating the landfill leachate. The landfill leachate is bred and propagated by sulfate reducing bacteria in the anaerobic fermentation and biological treatment anaerobic stages of a landfill site, sulfate radicals are converted into sulfides, the sulfides are gradually oxidized into sulfur particles in an intermediate water tank and a membrane system after entering the membrane system, the sulfur particles are accumulated on the surfaces of a filter, a membrane channel and a membrane to form a compact pollution layer, and finally membrane fouling is caused, so that the operation efficiency and the service life of the membrane are seriously influenced. Aiming at the condition of sulfur pollution, the conventional acidic and alkaline cleaning agents lack pertinence at present, have poor cleaning effect and even cause membrane elements to be scrapped.

At present, the cleaning effect of the existing acidic cleaning agent and alkaline cleaning agent on sulfur pollution is poor.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the prior membrane used for membrane treatment of a landfill leachate treatment system is polluted, and the problem of no special and effective membrane cleaning agent is solved.

The technical scheme for solving the technical problems comprises the following steps: a membrane cleaning agent is provided. The membrane cleaning agent comprises the following components: 55-60 percent of deionized water, 3-9 percent of polyphosphate, 3-6 percent of chelating agent, 20 percent of sodium hydroxide, 5 percent of sodium carbonate, 1 percent of sodium dodecyl benzene sulfonate, 1-3 percent of small molecular alcohol and 1-3 percent of alcohol amine by mass,

The invention also provides a preparation method of the membrane cleaning agent, which comprises the following steps:

Weighing 55-60% of deionized water in a reaction kettle, starting a stirrer, introducing cooling water into a jacket, adding 3-9% of polyphosphate, 3-6% of chelating agent and 20-25% of sodium hydroxide, stirring and dissolving completely at a temperature lower than 40 ℃, then sequentially adding 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine, stirring and dissolving completely, and thus obtaining the sodium dodecyl benzene sulfonate.

The invention also provides the application of the membrane cleaning agent, which is used for cleaning the membrane after filtering the garbage percolate. Further, the membrane comprises at least one of a nanofiltration membrane, a microfiltration membrane, a roll type reverse osmosis membrane, a disc tube type reverse osmosis membrane or a super reverse osmosis membrane.

Wherein, in the using method of the membrane cleaning agent, the mass concentration of the membrane cleaning agent is 2-5% when in use.

The invention has the beneficial effects that:

The membrane cleaning agent disclosed by the invention has the advantages that the removal effect on sulfur pollutants is improved, and organic matter blockage and microorganism blockage can be effectively cleaned; the cleaning agent disclosed by the invention adopts the anionic surfactant and the nonionic surfactant in a matching way, so that the synergistic effect and the salt resistance of the surfactants are improved, and the good emulsification and dispersion effects of the surfactants are still kept under the condition of high salt content. The membrane cleaning agent disclosed by the invention is suitable for nanofiltration, microfiltration, RO, DTRO and SRO systems, especially for a high-concentration wastewater membrane concentration treatment process, can effectively remove sulfur-containing organic-inorganic composite pollutants, is convenient to use, and can meet the use requirements of the cleaning equipment conditions of common membrane systems.

The chelating agent is added into the cleaning agent, and the cleaning agent mainly plays a role in complexing in cleaning and complexing with cations in pollutants to prevent the cations from forming insoluble compounds with organic matters, so that the cleaning agent plays a role in cleaning, stripping and dispersing. The chelating agent is preferably at least one of EDTA-2Na and EDTA-4Na in order to improve the chelating effect and reduce the cost, and various chelating agents can be used, such as ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), and hydroxyethylethanamine triacetic acid (HEDTA).

In the membrane cleaning agent, the small molecular alcohol is at least one of ethanol or isopropanol. The small molecular alcohol mainly refers to alcohol with the carbon atom number less than 4, and after the carbon atom number exceeds 4, the alcohol has a relatively strong peculiar smell and is not suitable for being used as a film cleaning agent. In the small molecular alcohol, methanol is toxic and has a lower boiling point, the effect is not good, the boiling points of ethanol and isopropanol are moderate, no obvious toxicity exists, and the cost performance is high.

In the film cleaning agent, for better emulsification and dispersion, the alcohol amine is at least one of monoethanolamine, diethanolamine or triethanolamine; the alcohol amine has low toxicity, no carcinogenicity, no obvious peculiar smell and safe use.

In the membrane cleaning agent, in order to improve the decontamination, dispersion and emulsification capacity of the membrane cleaning agent, the polyphosphate is at least one of sodium tripolyphosphate, sodium hexametaphosphate or potassium pyrophosphate.

The invention also provides a preparation method of the membrane cleaning agent, which comprises the following steps:

Weighing 55-60% of deionized water in a reaction kettle, starting a stirrer, introducing cooling water into a jacket, adding 3-9% of polyphosphate, 3-6% of chelating agent and 20-25% of sodium hydroxide, stirring and dissolving completely at a temperature lower than 40 ℃, then sequentially adding 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine, stirring and dissolving completely, and preparing to obtain the sodium dodecyl benzene sulfonate-containing aqueous solution

At present, no special cleaning agent specially used for cleaning sulfur pollution in a landfill leachate treatment system exists in the market. The existing membrane cleaning agent mainly considers the pollution blockage caused by cleaning organic matters or inorganic sediments (carbonate, metal oxide, sulfate) and the like, the organic matter pollution is mainly to strip the organic matters from a system and carry the organic matters out along with water flow, and the action mechanism is infiltration, stripping and dispersion; the inorganic pollution is mainly removed by an acid washing method.

However, sulfur pollution is different from organic pollution and inorganic pollution, and good cleaning effect cannot be achieved by adopting the two cleaning agents. When the membrane cleaning agent specially aiming at sulfur pollution is designed, the components (EDTA, polyphosphate, sodium dodecyl benzene sulfonate and the like) with good functions of infiltration, stripping and dispersion are selected, and the membrane cleaning agent has the effect of an alkaline cleaning agent and can clean organic pollution in a membrane. Meanwhile, the invention also particularly adds components such as alcohol ammonia, and the like, so that the speed of dissolving sulfur pollutants can be effectively improved, and the pollutants can be conveniently taken away from the system.

The membrane which is suitable for being cleaned by the cleaning agent is the membrane after filtering the garbage percolate, and is particularly suitable for cleaning a nanofiltration membrane, a microfiltration membrane, a roll type reverse osmosis membrane, a disc tube type reverse osmosis membrane or a super reverse osmosis membrane in a garbage percolate system.

the following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.

Example 1

Weighing 55% of deionized water in a reaction kettle, starting a stirring device, starting jacket cooling water, firstly adding 4% of EDTA-4Na, 6% of sodium tripolyphosphate and 20% of sodium hydroxide, sequentially adding 5% of sodium carbonate, 3% of sodium dodecyl benzene sulfonate, 2% of ethanol and 5% of triethanolamine after completely dissolving at a temperature lower than 40 ℃, and stirring and completely dissolving to obtain a finished product.