CN213680297U - Landfill leachate treatment system - Google Patents

Abstract

The utility model provides a landfill leachate processing system belongs to waste water treatment technical field, and its characterized in that includes equalizing basin, little electrolytic reactor, neutralization coagulation sedimentation tank, ozone catalytic oxidation ware, two-stage AO biochemical treatment pond, two heavy ponds, degree of depth ozone catalytic oxidation ware, aeration biological filter, disinfection pond. The utility model has the advantages of high quality treatment effect, no generation of concentrated water, stable and reliable operation, low investment and operation cost and the like.

Description

Landfill leachate treatment system

Technical Field

The utility model belongs to the technical field of waste water treatment, specifically speaking, the utility model relates to a landfill leachate's processing system.

Background

Urban garbage is a great problem in urban environment management. Landfill leachate in refuse transfer stations, incineration sites or landfill sites is generated from various compounds and rotten substances, contains BOD, COD, nitrogen-containing compounds, phosphorus-containing compounds, organic halides, sulfides, inorganic salts and the like with extremely high concentration, and is not only smelly but also a few carcinogens.

The landfill leachate is high-concentration organic wastewater which has complex components and large change of water quality and water quantity and has the following main characteristics: the concentration of pollutants is high; the content of organic pollutants is high, and the components are complex; the proportion of the microorganism nutrient elements in the percolate is seriously disordered; the water quality changes greatly; the metal content is higher.

The difficulty of landfill leachate treatment is also manifested by its variability: the production amount changes seasonally, and the rainy season is obviously larger than the dry season; the pollutant composition changes seasonally, and the pollutant composition and concentration in the leachate in dry and cold seasons of the landfill in plain areas are low; the pollutant composition and its concentration vary with the age of the landfill.

The landfill leachate contains more organic pollutants, up to 77, and 5 carcinogens and auxiliary carcinogens. Landfill leachate contains more than 10 metal ions, and the metal ions can have serious inhibition effect on the biological treatment process. The difficulty of handling is very great.

At present, the whole-flow treatment method of landfill leachate is mostly double-membrane treatment (MBR + NF/RO), and the outstanding problems are as follows: 1. the pretreatment is not ideal, so that the biochemical effect is extremely poor; 2. the NF/RO membrane is quickly blocked, and the generated concentrated water is not removed, so that the dead circulation is caused.

Disclosure of Invention

The utility model aims to provide an in to current landfill leachate treatment process, investment and running cost are high, produce drawbacks such as dense water still needs further processing, provide one kind and do not adopt the embrane method, investment and running cost are low, landfill leachate treatment system that the treatment effect is good.

In order to achieve the above object, the utility model provides a pair of landfill leachate processing system combines together advanced oxidation technology and degree of depth biochemical treatment technique, includes in proper order: the device comprises an adjusting tank, a micro-electrolysis reactor, a neutralization coagulation flocculation sedimentation tank, an ozone catalytic oxidation device, a two-stage A/O biochemical reaction tank, a secondary sedimentation tank, a deep ozone catalytic oxidation device, an aeration biological filter, a disinfection tank and a sludge concentration tank, wherein the first stage A/O of the two-stage A/O biochemical reaction tank is an anaerobic tank/a first stage aerobic tank, the second stage A/O of the two-stage A/O biochemical reaction tank is a facultative tank/a second stage aerobic tank, combined fillers are arranged in the anaerobic tank and the facultative tank of the two-stage A/O reaction tank, and suspended fillers are arranged in the first stage aerobic tank and the second stage aerobic tank. The landfill leachate of the invention is treated by the following steps: (1) the landfill leachate firstly enters an adjusting tank, and the water quantity is stored and adjusted; (2) the water in the regulating reservoir enters a micro-electrolysis reactor for high-efficiency pretreatment, phenol, chlorinated organic matters, organic sulfides, heavy metal ions and the like in the wastewater can be decomposed and removed, favorable conditions are created for the high-efficiency and stable operation of a back-stage biochemical system, and meanwhile, COD in the raw water is greatly degraded, and the water inlet load is reduced; (3) the water passing through the micro-electrolysis reactor enters a neutralization coagulation flocculation sedimentation tank, and the biodegradability of the wastewater is improved after pollutants such as heavy metal ions, organic sulfides difficult to biochemical development, indole, benzene series (aromatic organic matters) and the like in the wastewater are removed or decomposed simultaneously through the processes of oxidation-reduction-coagulation adsorption-flocculation-sedimentation; (4) the water treated by the neutralization coagulation flocculation sedimentation tank enters an ozone catalytic oxidation device, and the organic matters difficult to degrade are further subjected to oxidative decomposition by utilizing the strong oxidizing property of ozone and the high-efficiency catalytic activity of a catalyst; (5) the water after the ozone catalytic oxidation reactor treatment enters a two-stage A/O biochemical reaction tank, the first stage A/O is anaerobic/aerobic biochemical treatment, combined filler is arranged in the anaerobic tank, suspended filler is arranged in the first stage aerobic tank, the wastewater is subjected to hydrolysis-acidification in the anaerobic tank, long-chain macromolecular organic pollutants are degraded into small molecular compounds which are easy to decompose and utilize by aerobic microorganisms, metabolism is performed by a large amount of microorganisms attached to the surface of the filler in the first stage aerobic tank under the condition of sufficient aeration and oxygenation, organic matters are decomposed, and the wastewater is purified. The second stage A/O is facultative/aerobic treatment, the effluent of the first stage aerobic tank enters a facultative tank, combined fillers are arranged in the facultative tank, the denitrification effect of converting nitrate nitrogen in wastewater into nitrogen in the facultative tank is better, the effluent of the facultative tank enters a second stage aerobic tank, the second stage aerobic tank is provided with suspended fillers, COD and ammonia nitrogen are further removed through biological contact oxidation reaction, and the ammonia nitrogen is converted into nitro nitrogen after being oxidized by nitrifying bacteria; (6) the water treated by the two-stage A/O biochemical reaction tank enters a secondary sedimentation tank for mud-water separation, part of sludge flows back to the facultative tank, and the rest sludge is periodically discharged to a sludge concentration tank; (7) the water treated by the secondary sedimentation tank enters a deep ozone catalytic oxidizer to further decompose residual COD, and meanwhile, the water has good removal effect on chroma and smell, so that the effluent quality is higher; (8) the water treated by the deep ozone catalytic oxidizer enters a biological aerated filter for further treatment by microorganisms; (9) the water treated by the biological aerated filter enters a disinfection tank, and the water after disinfection is discharged after reaching the standard; (10) and (4) dehydrating the sludge in the sludge concentration tank and returning the sludge to the refuse landfill.

Compared with the prior art, the utility model has the advantages of as follows:

1. low investment and operation cost

2. Without concentrated water, without further treatment

The operation is stable, and the water quality of the produced water is good.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments and accompanying drawings.

Embodiment 1, the landfill leachate treatment system of this embodiment includes in proper order: the device comprises an adjusting tank, a micro-electrolysis reactor, a neutralization coagulation flocculation sedimentation tank, an ozone catalytic oxidation device, a two-stage A/O biochemical reaction tank, a secondary sedimentation tank, a deep ozone catalytic oxidation device, an aeration biological filter, a disinfection tank and a sludge concentration tank, wherein the first stage A/O of the two-stage A/O biochemical reaction tank is an anaerobic tank/a first stage aerobic tank, the second stage A/O of the two-stage A/O biochemical reaction tank is a facultative tank/a second stage aerobic tank, combined fillers are arranged in the anaerobic tank and the facultative tank of the two-stage A/O reaction tank, and suspended fillers are arranged in the first stage aerobic tank and the second stage aerobic tank. The landfill leachate is discharged after reaching the standard after passing through the treatment system, and the sludge is returned to a landfill after being concentrated. The process of the utility model discloses a landfill leachate treatment system's specific treatment process as follows: (1) the landfill leachate firstly enters an adjusting tank, and the water quantity is stored and adjusted; (2) water in the regulating reservoir enters a micro-electrolysis reactor for high-efficiency pretreatment; (3) the water treated by the micro-electrolysis reactor enters a neutralization coagulation flocculation sedimentation tank, and the biodegradability of the wastewater is improved through the processes of oxidation-reduction-coagulation adsorption-flocculation-sedimentation; (4) the water treated by the neutralization coagulation flocculation sedimentation tank enters an ozone catalytic oxidation device, and the organic matters difficult to degrade are further subjected to oxidative decomposition by utilizing the strong oxidizing property of ozone and the high-efficiency catalytic activity of a catalyst; (5) the water treated by the ozone catalytic oxidation reactor enters a two-stage A/O biochemical reaction tank, the first stage A/O is anaerobic/aerobic biochemical treatment, the second stage A/O is facultative/aerobic treatment, combined fillers are arranged in the anaerobic tank and the facultative tank, and suspended fillers are arranged in the first stage aerobic tank and the second stage aerobic tank; (6) the water treated by the two-stage A/O biochemical reaction tank enters a secondary sedimentation tank for mud-water separation, part of sludge flows back to the facultative tank, and the rest sludge is periodically discharged to a sludge concentration tank; (7) the water treated by the secondary sedimentation tank enters a deep ozone catalytic oxidizer to further decompose residual COD and the like to achieve deep treatment; (8) the water treated by the deep ozone catalytic oxidizer enters an aeration biological filter for deep treatment of microorganisms; (9) the water treated by the biological aerated filter enters a disinfection tank, and the water after disinfection is discharged after reaching the standard; (10) and (4) dehydrating the sludge in the sludge concentration tank and returning the sludge to the refuse landfill.

The beneficial effects of the utility model include: (1) the investment and operation cost is low; (2) no concentrated water exists, and no secondary pollution is generated; (3) the operation is stable, and the water quality of the produced water is good.

Claims (1)

1. The garbage leachate treatment system is characterized in that an advanced oxidation technology and a deep biochemical treatment technology are combined, and the system sequentially comprises: the device comprises an adjusting tank, a micro-electrolysis reactor, a neutralization coagulation flocculation sedimentation tank, an ozone catalytic oxidation device, a two-stage A/O biochemical reaction tank, a secondary sedimentation tank, a deep ozone catalytic oxidation device, an aeration biological filter, a disinfection tank and a sludge concentration tank, wherein the first stage A/O of the two-stage A/O biochemical reaction tank is an anaerobic tank/a first stage aerobic tank, the second stage A/O of the two-stage A/O biochemical reaction tank is a facultative tank/a second stage aerobic tank, combined fillers are arranged in the anaerobic tank and the facultative tank of the two-stage A/O reaction tank, and suspended fillers are arranged in the first stage aerobic tank and the second stage aerobic tank.

Images