What is the reason for the proportion of water in the DTRo membrane for alkali cleaning, and the hig

There is no specific ratio of alkali and water for alkali cleaning DTRO membrane, the pH value of SSRO membrane is generally controlled between 10-12, and the special alkaline cleaning agent for DTRO membrane is generally used, and it can also be used together with fungicide, and the pH value of pickling should not be lower than 2

DTRO membrane features:

1. The treatment effect does not depend on the biodegradability of the influent water, the system is stable, and the effluent quality is high.

2. It does not depend on pretreatment, and the open flow channel can treat wastewater containing more colloids and suspended solids.

3. The mold component has a short flow, a wide flow channel, and special hydraulic conditions make the liquid turbulent in the membrane column, and it is not easy to cause membrane pollution.

4. Pollution is easy to remove, especially biological pollution.

5. The rate is high, the rate can reach 80% at 20-50bar, and the rate can reach 90% when the pressure reaches 150bar.

6. Standardized mold component series, flexible assembly, easy to install indoors and containers, and small footprint.

7. Low energy consumption and operating costs.

8. High degree of automation, easy to operate and maintain.

1) The effluent quality is good. DTRO membrane has a good retention effect on refractory organic matter and other ammonia nitrogen compounds. The stable and thorough interception of substances such as high COD and heavy metals makes DTRO membrane technology irreplaceable in the application of seawater desalination, high COD, garbage and wastewater treatment, acid-containing wastewater, etc.

2) Occupy less space. The DTRO membrane system is an integrated installation, and the ancillary structures and facilities are also small structures, which occupy a small area and save the application space.

3) Minimal chemical handling costs. The traditional treatment process generally requires a large amount of agent for the precipitation of suspended solids in the early stage, while the DTRO membrane only needs a small amount of agent in the work.

4) Simplify the water treatment process. DTRO membrane technology is simple to operate and maintain, does not rely on pretreatment in operation, only needs to carry out simple pretreatment, and is easy to realize automatic control and management. **Yantai Jinzheng environmental protection.

DTRO Membrane Cleaning Procedure:

1. Prepare cleaning solution.

2. Low flow input cleaning solution.

First, use a cleaning pump to mix the cleaning solution once to preheat the cleaning solution at a low flow rate. The raw water is then replaced with the lowest possible purge fluid pressure, which only needs to be sufficient to compensate for the pressure loss from the influent to the concentrated water, i.e. the pressure must be low enough to produce a significant permeate water production. The low-pressure displacement operation minimizes fouling and re-settles to the surface of the membrane (as appropriate), draining a portion of the concentrated water to prevent dilution of the cleaning solution.

3. Circulation. When the raw water is replaced, the cleaning solution should appear in the concentrated water pipe, so that the cleaning solution should be returned to the cleaning tank, and the temperature of the cleaning solution should be constant.

4. Soaking. Stop the operation of the cleaning pump and allow the membrane element to be completely immersed in the cleaning solution. Sometimes an hour or so of soaking is sufficient, but for stubborn contaminants, an extended soaking time is required, such as 10 to 15 hours or overnight. In order to maintain the temperature of the immersion process, a very low circulating flow rate can be used.

5. High flow pump circulation.

The high flow rate washes away contaminants washed out by the cleaning fluid. If the contamination is severe, the flow rate listed in Table 1 will be more than 50% for cleaning, while in the case of high flow rates, the problem of high pressure drop will occur. The maximum allowable pressure drop for a single element is 1 bar (15 psi) and the maximum allowable pressure drop for a multi-pressure vessel is.

6. Rinse. Unless there is a corrosion problem (e.g., static seawater can corrode stainless steel pipes), a pre-treated and qualified water flush system can be used to flush the cleaning fluid. To prevent precipitation, the minimum wash temperature is 20. Note:

During the pickling process, the change in the pH value of the cleaning solution should be checked at any time. When the acid is consumed by the dissolved inorganic salt precipitate, and when the pH rises exceeded, the acid should be added to the cleaning chamber. The total cycle time of the pickling solution should not exceed 20 minutes.

After this, the cleaning solution may be saturated with rinsed out inorganic salts, and contaminants can be deposited on the surface of the membrane. At this point, the qualified pre-treated water is used to drain the first cleaning solution from the membrane system and the cleaning system, and the cleaning solution is reconfigured for the first acid cleaning operation. If the system must be shut down for more than 24 hours, components should be stored in 1% (by weight) sodium bisulfite in aqueous solution.

Before cleaning the system, it is recommended that the membrane elements be removed from the system to be cleaned and that the cleaning effect of the individual elements be evaluated.

7. Clean the multi-stage system.

In the flushing and immersion steps of a multi-stage system, all parts of the entire system can be carried out simultaneously, but the high flow cycle must be carried out in stages to ensure that the circulation flow of the first stage is not too low and the circulation flow of the last stage is not too high. This can be achieved by cleaning each section separately or by setting up a different purge pump for each flow requirement.

Please describe in detail the process of acid and alkali cleaning? Such as: cleaning process, acid and alkali concentration, pH value and other issues; There is also the addition of antiscalants and so on.

There may be a problem with the pharmacy, in general. It takes about an hour and a half for the temperature to rise to 40, and the amount of cleaning agent you add, generally add 3-4 barrels (40kg barrels).

DTRO reverse osmosis membrane process.

Theoretically, as long as the pressure applied on both sides of the reverse osmosis membrane exceeds the osmotic pressure, there can be reverse osmosis, but in the actual process of device operation, due to the influence of factors such as concentration polarization, the pressure applied is often several times the osmotic pressure.

1. The structure is different: the DTRO process flow of landfill leachate treatment is simple and compact, the complete set of equipment is standardized, and the two-stage DTRO process complete set of equipment integrates the sand filtration system for pretreatment, the security filter, the membrane module for reverse osmosis separation, the high-pressure pump, the circulating pump, the cleaning water tank for system cleaning, and the MCC cabinet and PLC cabinet for equipment power supply and control.

The PT ST modules used in the STRO system offer the advantages of low membrane fouling, high packing density, low salt throughput and built-in standard cleaning and maintenance. At the same time, the STRO system has the characteristics of reversible osmosis unit detachable, simple system installation and maintenance, small equipment footprint and can be placed in containers for movement. Ideal for small-scale landfill leachate treatment.

2. The bias of their respective performance points is different: the DTRO process of landfill leachate treatment has strong process stability, simple maintenance, low energy consumption, and the DTRO membrane module effectively avoids the scaling of the membrane, reduces the membrane pollution, and prolongs the life of the reverse osmosis membrane.

The STRO process is used to treat the leachate, the system has high operating efficiency and stability, the removal rate of ammonia nitrogen, the removal rate of COD is above, the removal rate of conductivity is 92%-95%, the SS is not detected in the effluent, and the zero discharge of pollutants is achieved in combination with the reinjection of concentrate.

Tubular membrane technology, abbreviated as DT, is commonly referred to as Tubular Reverse Osmosis (DTRO) and Tubular Nanofiltration (DTNF), and its membrane structure is very different from that of traditional spiral membranes.

The DT uses an open flow path, the liquid enters the pressure vessel through the inlet, the treated liquid flows into the deflector plate at the shortest distance, reverses 180 degrees from one side of the membrane to the other side of the membrane, then enters the next deflector, and finally, flows out from the outlet. This special design allows the liquid to flow through the membrane surface and collide with the bumps on the plate surface to form a turbulent flow, increasing the transmission rate and self-cleaning function, and prolonging the service life of the membrane.

The zero-discharge technology mainly includes serious blockage of the water distribution pipe of the anaerobic tank, which affects the COD removal rate of the anaerobic tank, and the difficulty of troubleshooting the submerged jet aerator, which makes the dissolved oxygen of the nitrification tank lower than the standard, affects the load of the nitrification tank and the ammonia nitrogen removal rate, and the nitrifying bacteria are poisoned by high temperature and chemicals in the garbage and die, so that the effluent index of the nitrification tank seriously exceeds the standard, and the flux of the ceramic membrane ultrafiltration system decreases seriously, and the water consumption of ultrafiltration production increases significantly.

With the development of economy and technology and the continuous expansion of urban scale, the traditional municipal solid waste landfill treatment can no longer meet the environmental protection requirements under the new situation. According to the basic principles of harmlessness, reduction and resource utilization of municipal solid waste treatment, waste incineration power generation has become a suitable method to solve the problem of municipal solid waste. Landfill leachate is the sewage leached out of garbage due to fermentation, rainwater washing, and ground flushing water soaking in the process of storage, transportation and stacking.

Landfill leachate is a kind of high-concentration organic wastewater with complex composition, which is black, has a strong foul odor, has high COD, high ammonia nitrogen, high metal content, imbalance in the proportion of microbial nutrients, complex water quality, large changes in water quality, and great harm, and must be deeply treated, otherwise it will seriously pollute the environment.

The zero-discharge technology mainly includes serious blockage of the water distribution pipe of the anaerobic tank, which affects the COD removal rate of the anaerobic tank, and the difficulty of troubleshooting the submerged jet aerator, which makes the dissolved oxygen of the nitrification tank lower than the standard, affects the load of the nitrification tank and the ammonia nitrogen removal rate, and the nitrifying bacteria are poisoned by high temperature and chemicals in the garbage and die, so that the effluent index of the nitrification tank seriously exceeds the standard, and the flux of the ceramic membrane ultrafiltration system decreases seriously, and the water consumption of ultrafiltration production increases significantly.

DTRO is better.

Reason: DTRO has considerable advantages in landfill leachate treatment, good effluent quality, small external environmental impact, short commissioning cycle, high degree of automation, small footprint, low operation and maintenance costs.

Landfill leachate refers to a kind of high-concentration wastewater formed by the water contained in the garbage in the landfill, the rain and snow water entering the landfill and other water, deducting the saturated water holding capacity of the garbage and the overburden layer, and passing through the garbage layer and the overburden layer.

The water quality of landfill leachate is quite complex, generally containing high concentrations of organic matter, heavy metal salts, SS and ammonia nitrogen, and landfill leachate not only pollutes soil and surface water sources, but also pollutes groundwater.

The DTRO Disc Tube Reverse Osmosis membrane is very effective in treating landfill leachate, and the special structure and hydraulic design make the membrane module easy to clean, avoiding scaling and other membrane fouling, thus extending the life of the membrane. The equipment has a high degree of automation, and because most of the pipes and parts used in the DTRO system are standard parts, it is convenient to install and maintain. At the same time, the diaphragms in the system can be replaced individually, unlike spiral membranes, where only one diaphragm is damaged, the entire membrane column needs to be replaced, which reduces the maintenance costs of the DTRO system.

The landfill leachate treatment equipment with DTRO technology has good adaptability to the leachate at all stages of the landfill, so as to achieve the standard process effect.

The most preferred solution for landfill leachate is the disc tube reverse osmosis DTRO process, the previous misunderstanding of DTRO ** does not understand the technology and the product completely depends on the cost of imports, Jinzheng Environmental Protection Group has realized the localization of DTRO, in the application of DTRO process to treat landfill leachate There are many successful cases, you can consult their technical personnel in detail.

The internal structure of the STRO is rolled. The membrane area is larger than that of DTro. STRO has higher requirements for influent water quality than DTRO, and the COD of influent water should be controlled within 1500.

If the water quality allows, it is more economical to use the STRO. The specific water quality of the project depends on the specific process section. STRO is also used in the latter part of the DTRO.

Neither of these works quite well, and after several years of validation, DTRO has failed. STRO is a similar process, changing the soup without changing the dressing.

Neither process is mainstream.

Used in the landfill leachate industry, DTRO and STRO are both OK, STRO is more energy-efficient than DTRO equipment occupies a smaller footprint, but the water SS requirements are higher, if the membrane is polluted and the STRO is scrapped, DTRO can be disassembled and cleaned one by one.

STRO advantages, advanced technology, saving energy and floor space.

DTRO advantage, stronger anti-pollution ability.

1. Adsorption pollution.

The adsorption of organic matter on the membrane surface is usually the main factor affecting the membrane performance. With the extension of time, the adsorption or accumulation of pollutants in the membrane pores will lead to the decrease of pore size and the increase of membrane resistance, which is difficult to recover, and the main pollutants are dissolved matter, emulsion, etc.;

2. Sedimentation pollution.

The concentration of hydroxides or carbonates and sulfates in the raw water exceeds its solubility, forming precipitates or scaling on the membrane, mainly colloids and particles, organic matter such as fats, proteins, humic acids, colloids, gels and polyhydroxy aromatic compounds, etc.; Inorganic substances such as calcium salts, phosphate salts, iron salts, magnesium salts, etc.;

3. Biological contamination.

A phenomenon in which microorganisms accumulate at the membrane-water interface, thereby affecting system performance. There are two stages of biofouling of membranes: adhesion and growth.

When no fungicide is added to the solution or the dosage is insufficient, adherent cells will grow and multiply with nutrients from the influent water, forming biofilms, such as bacteria and algae.