The Leachate Emergency Device A Compact and Mobile Solution for Landfill Leachate Treatment

The landfill leachate emergency device uses advanced treatment processes, such as short-range enhanced biochemical systems and membrane bioreactors, to ensure that the effluent quality meets national discharge standards.

Overall structure and features of the equipment:
Containerized emergency equipment for leachate is a mobile treatment equipment that integrates the leachate treatment system into a container.

Compact structure:

All treatment units, including pretreatment, biological treatment, deep treatment and disinfection equipment, are reasonably arranged inside the container. This compact structural design makes the equipment more efficient in space utilization and can complete complex treatment processes in a limited space. The size of the container is usually determined according to the transportation requirements and the scale of treatment. Common ones are standard 20-foot or 40-foot container specifications, which are convenient for transportation and rapid on-site deployment.

Strong mobility:

Based on the container design, the equipment can be easily transported to the site where leachate needs to be treated by trucks, ships and other means of transportation. Whether it is an urban landfill, a remote garbage dump, or a place where a leachate leak occurs, it can respond quickly and be put into use, effectively solving the problem that traditional fixed treatment facilities cannot arrive at the site for treatment in time.

Main treatment units and functions:
Pretreatment unit:
Screen system:

installed at the water inlet of the equipment, including coarse screens and fine screens. The coarse screen mainly intercepts large-volume garbage, such as branches, large plastic fragments, etc., and the bar spacing is generally 10-50mm. The fine screen is used to remove smaller suspended matter, such as fibers, paper fragments, etc., and the bar spacing is usually 1-10mm. Through the filtration of the screen, large particles of impurities can be prevented from entering the subsequent treatment unit, protecting the pumps, pipes and other precision parts in the equipment from blockage and damage.

Adjustment tank:

used to collect and temporarily store leachate after filtration through the screen. Since the amount and water quality of garbage leachate will change over time, the adjustment tank plays a buffering role, so that the subsequent treatment process can be carried out under relatively stable flow and water quality conditions. The adjustment tank is usually equipped with a stirring device to prevent the precipitation of solid matter in the leachate and ensure uniform water quality.

Coagulation and sedimentation device:

by adding coagulants (such as polyaluminium chloride, ferrous sulfate, etc.) and coagulants (such as polyacrylamide) to the leachate, the fine suspended matter and colloidal particles in it are condensed and precipitated. In this process, the reagent and leachate are first mixed quickly and fully in the mixing reaction tank, and then the condensed particles are allowed to settle to the bottom of the tank in the sedimentation tank. Coagulation and sedimentation can effectively remove most of the suspended solids and some organic matter in the leachate, reducing the load of subsequent treatment units.

Biological treatment unit:
Anaerobic bioreactor:

In an anaerobic environment, anaerobic microorganisms (such as methanogens, hydrolytic acidifying bacteria, etc.) are used to decompose the organic matter in the leachate. Common types of anaerobic bioreactors include upflow anaerobic sludge blanket (UASB) reactors, anaerobic baffle reactors (ABR), etc. In the UASB reactor, the leachate enters from the bottom and flows upward through the sludge bed containing a large number of anaerobic microorganisms, where the organic matter is decomposed into organic acids, carbon dioxide and methane. These reactors have a high organic load processing capacity and can significantly reduce the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) of the leachate.

Aerobic bioreactor:

Under aerobic conditions, aerobic microorganisms further decompose the organic matter in the leachate. For example, activated sludge reactor or biological contact oxidation reactor. In the activated sludge reactor, sufficient oxygen is provided to the leachate through the aeration system, so that the microorganisms in the activated sludge can completely oxidize and decompose the organic matter into carbon dioxide and water, and also have a good removal effect on ammonia nitrogen. The biological contact oxidation reactor decomposes organic matter through the biofilm attached to the filler. This method has a high concentration of microorganisms and a stable treatment effect.

Deep treatment unit:
Membrane separation system:

This is the key part of deep treatment, mainly including ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) membranes. Ultrafiltration membranes can intercept large molecular organic matter, colloids and bacteria, etc., and their pore size is generally between 0.001-0.1μm. The pore size of nanofiltration membranes is between ultrafiltration and reverse osmosis, and can remove divalent ions and some small molecular organic matter. The pore size of reverse osmosis membranes is very small, usually less than 0.0001μm, and has a high retention rate for salt and small molecular organic matter. Through this series of membrane treatments, the water quality of the leachate can be significantly improved to meet higher discharge standards or reuse standards.

Advanced oxidation device (optional):

When there are refractory organic matter in the leachate, advanced oxidation technology is required. For example, the ozone oxidation device decomposes organic matter by producing strongly oxidizing ozone. Ozone can attack active sites such as double bonds of organic matter and oxidize it into small molecular compounds. The Fenton oxidation device uses hydroxyl radicals produced by the reaction of ferrous ions and hydrogen peroxide to oxidize organic matter. Hydroxyl radicals have extremely high oxidizing activity and can oxidize almost all organic matter, effectively removing stubborn organic pollutants.

Disinfection unit:
Ultraviolet disinfector:

The leachate is irradiated with ultraviolet light to destroy the DNA structure of pathogens such as bacteria and viruses, making them lose their ability to reproduce and infect. Ultraviolet disinfection has the advantages of fast sterilization speed and no chemical residue. It is an environmentally friendly and efficient disinfection method. The disinfected leachate can be directly discharged or reused.

Chlorine dioxide generator (optional):

Chlorine dioxide gas is produced by chemical reaction. Chlorine dioxide has strong oxidizing properties and can effectively kill various pathogens. This disinfection method has a long-lasting disinfection effect and also has a good killing effect on viruses and spores. It is especially suitable for occasions with high disinfection requirements.

Workflow:
The leachate first enters the pretreatment unit of the container-type equipment, and after the large and small particles of impurities are removed by the grid system, it enters the regulating tank to adjust the water quality and water volume. In the coagulation and sedimentation device, fine suspended matter and colloids are precipitated by adding agents, and the supernatant flows into the biological treatment unit.

In the biological treatment unit, it first passes through the anaerobic bioreactor, where the organic matter is decomposed by anaerobic microorganisms under anaerobic conditions, and then enters the aerobic bioreactor. Under an aerobic environment, aerobic microorganisms further decompose the organic matter thoroughly and remove ammonia nitrogen at the same time.

The leachate after biological treatment enters the deep treatment unit, and is treated by ultrafiltration, nanofiltration and reverse osmosis through a membrane separation system to remove pollutants such as organic matter and salt. If there are difficult-to-degrade organic matter, it will also be treated by an advanced oxidation device.

Finally, the leachate after deep treatment enters the disinfection unit, and after ultraviolet disinfection or chlorine dioxide disinfection, the water that meets the discharge standard or reuse standard is discharged from the equipment.

Equipment advantages:
Quick response and deployment:

In the event of sudden leachate incidents, such as failure of the landfill leachate treatment system, a sharp increase in leachate due to heavy rain, or a leachate leakage accident, it can be quickly transported to the site and put into use. The installation and commissioning of the equipment is relatively simple, and the treatment process can be started in a short time to effectively control the spread of pollution.

Significant treatment effect:

It has a high efficiency in removing various pollutants in leachate. The removal rate of COD can reach 90% - 98%, the removal rate of ammonia nitrogen can reach 80% - 98%, and the removal rate of suspended solids can reach 95% - 99%. It can also effectively remove heavy metal ions and pathogens to ensure that the treated water quality meets relevant standards.

Adaptable to a variety of water qualities and working conditions:

The treatment process can be flexibly adjusted according to different leachate water qualities (such as organic matter content, salinity, pH, etc.) and treatment requirements. By changing the type and dosage of reagents, adjusting the process parameters of biological treatment, and selecting different membrane separation combinations, it can treat various complex leachates.

High degree of automation:

Equipped with advanced automatic control system, it can monitor and control various operating parameters of the equipment in real time, such as flow, pressure, temperature, pH value, etc. Data is collected through sensors, and the operating status of the equipment is automatically adjusted according to the preset program, such as pump flow, amount of reagent added, aeration intensity, etc., to reduce manual intervention and improve treatment efficiency and stability.

Environmental protection and resource recovery (optional):

In the process of treating leachate, some equipment can achieve resource recovery and utilization. For example, methane gas generated during anaerobic biological treatment can be collected and used as energy; if the water after deep treatment meets the reuse standard, it can be reused for greening irrigation, road washing, vehicle washing, etc. in the landfill, realizing the recycling of water resources.

Jiangsu Gena Environmental Engineering Co., Ltd. is a high-tech environmental engineering equipment company focusing on water treatment and chemical liquid separation, focusing on environmental protection and resource recycling. It focuses on the production and manufacturing of complete sets of landfill leachate treatment equipment, MVR evaporator equipment, complete sets of wastewater zero discharge equipment, complete sets of reclaimed water reuse equipment, complete sets of seawater desalination equipment, nanofiltration equipment and STRO/DTRO complete sets of equipment.

The company's management team has been devoted to the application of membranes and product technology development, environmental water treatment technology and equipment development, and new process development in the fields of industrial liquid purification, refining and separation in the field of landfill leachate and chemical industry for many years. It provides complete integrated solutions for more than 50 large industrial customers across the country, and has invested in more than 500 water treatment production equipment and industrial filtration production equipment. Customers are spread across multiple industries such as landfill leachate, chlor-alkali, polyvinyl chloride, coking, pesticides, smelting, and steel.

The company has obtained 27 intellectual property rights through its own development. The research and development projects include: reverse osmosis concentrated water treatment device for landfill leachate, energy-saving microfiltration membrane wastewater treatment device, landfill leachate treatment device for garbage transfer station, ultrasonic landfill leachate integrated GNSB anaerobic device, spiral water treatment activated carbon filtration device, groundwater treatment and prevention equipment, etc.