CN207671790U - A kind of landfill leachate advanced treatment system - Google Patents

Abstract

The utility model relates to a garbage leachate advanced treatment system, which belongs to the technical field of sewage resource utilization. The system includes a raw water tank unit, a filter unit, a high-pressure pump (group) unit, an online booster pump unit, a membrane unit, an instrument unit, a produced water tank unit and a cleaning unit; the water inlet of the raw water tank unit and the leachate treatment The water outlet of the system is connected, the water outlet of the raw water tank unit is connected with the water inlet of the filter unit, the water outlet of the filter unit is connected with the water inlet of the high-pressure pump unit, and the water outlet of the high-pressure pump unit is connected with the water inlet of the online booster pump unit , the water outlet of the online booster pump unit is connected to the water inlet of the membrane unit, the water outlet of the membrane unit is respectively connected to the water production tank unit and the instrument unit, the instrument unit is also connected to the cleaning unit, and the cleaning unit is connected to the filter unit. The utility model has the advantages of compact structure, good and continuous and stable water quality, convenient operation and maintenance, and the effluent can be reused for waste incineration power plants.

Description

A landfill leachate advanced treatment system

technical field

The utility model relates to the technical field of sewage resource utilization, in particular to an advanced treatment system for landfill leachate.

Background technique

At present, landfill technology or incineration technology is mainly used for the treatment of municipal solid waste in my country, and landfill leachate will be generated in the process of landfill or incineration treatment. The concentration of CODcr in landfill leachate is about 6000-70000mg/L, and the concentration of NH ₃ -N is about 1000-2500mg/L. It also contains a large amount of dissolved solids (sodium, calcium, chloride, sulfate, etc.), which is a change in water quality and water quantity. Organic wastewater with large volume, extremely complex composition and high concentration of pollutants, accompanied by a very heavy odor of corruption, if not properly treated, will cause serious pollution to the surrounding water and soil, and pose a serious threat to the health of the surrounding people .

With the progress and development of the society, the environmental capacity is gradually reduced, the environmental carrying capacity is gradually reduced, and the water resources are increasingly scarce with the development of the economy, which urgently requires the development of sewage resource technology. At present, the mainstream process adopted for resource utilization of landfill leachate is biochemical treatment + advanced treatment. Since landfill leachate contains more refractory organic matter, conventional biochemical effluent needs to be further treated by advanced treatment technology before it can meet the standard for reuse; Compared with advanced oxidation technologies such as Fenton oxidation and ozone oxidation, this technology has a significant advantage of being stable and up to standard. Therefore, it is still the mainstream technology for advanced treatment. However, low-pressure membrane systems such as nanofiltration membranes and roll-type reverse osmosis membranes cannot be directly used for advanced treatment of landfill leachate resource utilization due to low pollutant removal rate and low water production rate.

Utility model content

In view of this, the purpose of this utility model is to provide a landfill leachate advanced treatment system, through which the leachate treatment ultrafiltration effluent, domestic sewage, and production sewage can be reused after advanced treatment reaches the standard, so as to realize the waste incineration power plant Utilization of sewage resources.

In order to achieve the above object, the utility model provides the following technical solutions:

A landfill leachate advanced treatment system, the leachate advanced treatment system includes a raw water tank unit, a filter unit, a high-pressure pump unit, an online booster pump unit, a membrane unit, an instrument unit, a produced water tank unit, and a cleaning unit; The water inlet of the raw water tank unit is connected to the water outlet of the leachate treatment system, the water outlet of the raw water tank unit is connected to the water inlet of the filter unit, the water outlet of the filter unit is connected to the water inlet of the high-pressure pump unit, and the outlet of the high-pressure pump unit The water port is connected to the water inlet of the online booster pump unit, the water outlet of the online booster pump unit is connected to the water inlet of the membrane unit, the water outlet of the membrane unit is respectively connected to the water production tank unit and the instrument unit, and the instrument unit is also connected to the The cleaning unit is connected, and the cleaning unit is connected with the filter unit.

Further, an acid addition unit is also included, and the acid addition unit is connected with the raw water tank unit.

Further, a scale inhibitor unit is also included, and the scale inhibitor unit is connected to the pipeline between the raw water tank unit and the filter unit.

Further, an alkali addition unit is also included, and the alkali addition unit is connected with the produced water tank unit.

Further, the membrane group unit is composed of multiple membrane elements arranged in a specific way, wherein each membrane element includes a raw water inlet pipe, a concentrated water outlet pipe, a central pipe and a special reverse osmosis membrane layer wound on the central pipe, and the center pipe The upper end is provided with an upper end cover and a lip-shaped sealing ring, and the lower end of the central tube is provided with a lower end cover and a lip-shaped sealing ring. The central tube is provided with several small holes, and the lower end of the central tube is provided with a pure water outlet.

Further, the membrane module further includes a diversion distribution plate, and the diversion distribution plate is arranged on the feed end surface of the reverse osmosis membrane group.

Further, the internal guide grid of the reverse osmosis membrane group has a trapezoidal structure.

The beneficial effects of the utility model are that the utility model has compact structure, good and continuous and stable water quality, convenient operation and maintenance, and the effluent can be reused for waste incineration power plants.

Description of drawings

In order to make the purpose, technical solutions and advantages of the utility model more clear, the utility model will be further described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a block diagram of the utility model;

Figure 2 is a schematic diagram of the structure of the membrane unit.

Detailed ways

The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

In this embodiment, the advanced treatment system as shown in Figure 1 includes a raw water tank unit, a filter unit, a high-pressure pump unit, an online booster pump unit, a membrane unit, an instrument unit, a produced water tank unit, and a cleaning unit The water inlet of the raw water tank unit is connected with the water outlet of the leachate treatment system, the water outlet of the raw water tank unit is connected with the water inlet of the filter unit, the water outlet of the filter unit is connected with the water inlet of the high-pressure pump unit, and the high-pressure pump unit The water outlet of the online booster pump unit is connected to the water inlet of the online booster pump unit, the water outlet of the online booster pump unit is connected to the water inlet of the membrane unit, the water outlet of the membrane unit is respectively connected to the water production tank unit and the instrument unit, and the instrument unit It is also connected with the cleaning unit, and the cleaning unit is connected with the filter unit.

The raw water tank unit has the functions of buffering, homogenizing and regulating, and is used to store a certain amount of raw water. When the system is working, the acid adding unit is used to add acid to adjust the pH value of the incoming water. The acid addition unit consists of an acid storage tank and an acid addition metering pump, which dynamically adjusts the pH of the raw water to ensure that the pH of the incoming water is weakly acidic to prevent scaling of inorganic salt ions.

The filter unit is used to filter out residual particles in the feed water and protect the membrane elements of the system.

The high-pressure pump unit provides energy to raise the water pressure in the system above the osmotic pressure, and the processing capacity of the system can be adjusted through the frequency conversion control of the high-pressure pump.

Online pressurization unit, pressurization in the system, make up for pressure loss. Sewage is circulated and filtered in the membrane unit, and the pressure in the pipeline drops after passing through the membrane unit. In order to maintain the circulation pressure of each section of the membrane unit, the lost pressure needs to be supplemented; at the same time, increasing the internal circulation increases the water production rate of the membrane system.

The membrane unit is used to separate the salt ions and other impurities in the sewage. When the sewage with the osmotic pressure higher than each component flows inside the membrane tube, the water molecules pass through the membrane layer to the other side to remove the pollutants in the water. .

The instrument unit can adjust the system pressure, pH, and adjust the water production rate of the system. Through the information feedback of various sensors on the instrument unit, the automatic adjustment valve can realize the adjustment of the system operating pressure and change the proportion of water passing through the membrane layer to achieve the set value. water production rate requirements.

The product water tank unit stores the product water and adjusts the pH of the product water. The produced water tank can store and buffer a certain amount of produced water. Because the produced water is acidic, it is necessary to add alkali to the produced water tank unit through the alkali adding unit to adjust the pH to neutral before discharge. The alkali adding unit is composed of an alkali liquid storage tank and an alkali additive metering pump. Add alkali in the produced water tank to adjust the pH of the produced water.

The antiscalant unit is connected to the pipeline between the raw water tank unit and the filter unit. It is composed of an antiscalant tank and an antiscalant metering pump. The antiscalant can prevent the salt in the sewage from forming dirt on the film layer or the inner wall of the pipeline. Extend membrane life.

The cleaning unit realizes regular on-line cleaning of the membrane unit. The influent of the membrane advanced treatment system contains organic pollutants and components that are prone to scaling such as calcium and magnesium ions. During the treatment, it is easy to cause membrane pollution and scaling. When the water production of the membrane system decreases or the operating pressure increases, by opening The online cleaning unit performs chemical cleaning on the membrane to maintain the performance of the membrane layer and prolong the service life of the membrane. Cleaning water can be system produced water or industrial water.

As shown in Figure 2, the membrane unit includes a raw water inlet pipe 1, a concentrated water outlet pipe 2, a central pipe 3 and a special reverse osmosis membrane layer 4 wound around the central pipe. The upper end of the central pipe is provided with an upper end cover and a lip A sealing ring 5, a lower end cover and a lip-shaped sealing ring 6 are provided at the lower end of the central tube, a plurality of small holes 7 are provided on the central tube, and a pure water outlet 8 is provided at the lower end of the central tube. The membrane module also includes a diversion distribution plate 9, and the diversion distribution plate is arranged on the feed end surface of the reverse osmosis membrane group. The grid of the reverse osmosis membrane group is a trapezoidal structure.

In the utility model, the grid of the reverse osmosis membrane group adopts a trapezoidal structure, and the waste water/feed liquid flows in the channel formed by the grid, just like flowing in a tubular membrane, with small resistance, and at the same time, the internal transverse ribs can increase the flow rate of the material. The turbulent flow when the liquid flows reduces the concentration polarization of the membrane, thereby improving the pollution resistance of the STRO membrane module.

The working principle of the membrane unit: the waste water is directly fed from the end, and the waste water is evenly distributed to the feed end surface of the membrane module through a diversion distribution plate. Under the pressure, the dialysate flows into the middle dialysate collection pipe through the grid. The rest of the retained wastewater flows out of the concentrated water pipe through the parallel grid. STRO membrane modules are connected in series to increase water recovery and reduce energy consumption.

The working principle of the membrane unit: After the sewage is added to the raw water tank unit to adjust the pH to 6.5, the particulate matter larger than 10 microns in the raw water is removed after passing through the filter unit, and the raw water continues to enter the high-pressure pump unit, and the system is boosted by the high-pressure pump unit. The internal water pressure rises, and under the action of high pressure, the sewage passes through the membrane unit (STRO reverse osmosis membrane), and the water molecules in it are separated through the membrane layer to form reverse osmosis water. After the internal circulating sewage flows through the membrane module, the pressure After the reduction, it is boosted by the online booster pump and sent to the inlet of the membrane module for repeated circulation. With the discharge of the produced water, the concentration of the sewage inside the membrane layer increases, and the final cycle is concentrated and then discharged through the pressure control valve.

The utility model adopts the STRO membrane module. Compared with other membrane modules, it has the following advantages: 1. It can directly treat the leachate with medium and low COD concentration; 2. It has good anti-pollution performance and long membrane life; 3. Water recovery rate high,

However, other membrane systems, such as conventional roll-type membrane systems, have high requirements for pretreatment, are easy to clog, and have low water recovery rates, requiring multi-stage combinations. However, the component structure of the disc-tube membrane system is complex, and the system investment is large, so it is only suitable for small-scale applications.

STRO membrane modules have the following characteristics

While the performance of other types of RO systems is (often) limited by membrane fouling and fouling issues, the ST membrane system relies on its own optimized hydrodynamic system to reduce the troubles caused by these problems.

Simplified pretreatment: With an open channel (structure), ST reverse osmosis modules can directly treat seawater or leachate with an SDI index up to 20 without problems. Other RO systems generally require the SDI index to be ≦3. (Therefore) simple sand filter and security filter can meet the SDI index requirements of ST membrane system, but to meet the requirements of other systems, only through more complex filtration and chemical treatment.

High recovery rate and low energy consumption: the recovery rate of seawater is as high as 30-60%, and the energy consumption of water production is only 6-10kWh/m3.

The recovery rate of leachate treatment is as high as 80-90% (TDS=5.000ppm), and the energy consumption of water production is 4-10kWh/m3. The above data refer to the standard system, so if the concentrated water energy recovery is considered, the energy consumption of seawater desalination can be reduced by another 50%.

Very little chemical operation cost: Unlike other RO systems, ST membrane modules do not require long-term influent pretreatment, and only need to add acid when leachate is treated.

Long membrane service life: low membrane fouling scaling rate, high stability, and a simple and effective built-in cleaning system make the life expectancy of ROCHEM system membrane generally not affected by the quality of influent water. The data show that the actual service life of the membrane is more than 5 years.

Easy Membrane Replacement: Compared with DTRO or PTRO, component replacement and maintenance are easier.

High effluent quality: ROCHEM's RO system uses industrial separation membranes with the latest technology and the most stable chemical properties, rather than general water treatment membranes. In addition (due to) the use of flat sheet membranes, (therefore) the quality of the installed membranes can also be precisely selected and controlled to ensure minimum salt passage, high quality and continuous water production.

Finally, it is noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in the form Various changes can be made in the above and in the details without departing from the scope defined by the claims of the present invention.

Claims (7)

1. a kind of landfill leachate advanced treatment system, it is characterised in that：The percolate advanced treatment system includes raw water tank Unit, high-pressure pumping unit, is pressurized pump unit, film group unit, instrument pack, production water pot unit and cleaning list at filter element online Member；The water inlet of the raw water tank unit and the water outlet of percolation liquid treating system connect, the water outlet and mistake of raw water tank unit The water inlet connection of unit is filtered, the water outlet of filter element and the water inlet of high-pressure pumping unit connect, the water outlet of high-pressure pumping unit Mouth is connect with the water inlet of online supercharging pump unit, and the online water outlet for being pressurized pump unit is connect with the water inlet of film group unit, The water outlet of film group unit is connect with production water pot unit, instrument pack respectively, and instrument pack is also connect with cleaning unit, and cleaning is single Member is connect with filter element.

2. a kind of landfill leachate advanced treatment system according to claim 1, it is characterised in that：It further include acid adding list Member, the acid adding unit are connect with raw water tank unit.

3. a kind of landfill leachate advanced treatment system according to claim 2, it is characterised in that：It further include antisludging agent list Member, the antisludging agent unit are connected on the pipeline between raw water tank unit and filter element.

4. a kind of landfill leachate advanced treatment system according to claim 3, it is characterised in that：Further include adding alkali list Member, described plus alkali unit are connect with production water pot unit.

5. a kind of landfill leachate advanced treatment system according to claim 4, it is characterised in that：The film group unit by Branched membrane component is rearranged by certain way, wherein every membrane component includes raw water water inlet pipe, condensed water outlet pipe, central tube With the reverse osmosis film layer on winding central tube, the upper end of central tube is provided with upper end cover and lip-type seal ring, the lower end of central tube It is provided with bottom end cover and lip-type seal ring, several apertures are provided on the central tube, the lower end of central tube is provided with pure water and goes out The mouth of a river.

6. a kind of landfill leachate advanced treatment system according to claim 5, it is characterised in that：The membrane component also wraps Flow guide distribution disk is included, the flow guide distribution disk is set to reverse osmosis membrane group charging end face.

7. a kind of landfill leachate advanced treatment system according to claim 6, it is characterised in that：The reverse osmosis membrane group Internal diversion grid be trapezium structure.