CN-118929952-B - Leachate treatment system for garbage ecological landfill

Abstract

The landfill leachate treatment system comprises a landfill reservoir area, emergency household garbage leachate treatment equipment, fly ash leachate treatment equipment and a common reverse osmosis device, wherein the landfill reservoir area comprises the emergency household garbage reservoir area and the fly ash reservoir area, a plurality of separation dams are arranged in the emergency household garbage reservoir area at intervals to form a plurality of transfer reservoir areas, the conventional fly ash landfill is reconfigured, the incineration disposal capacity is reduced under the condition of sudden failure of the incineration equipment, the generated excess household garbage is reduced, the emergency disposal scheme is provided, the landfill can be changed into the landfill reservoir area after the emergency household garbage disposal and the fly ash reservoir area are filled to the elevation, the whole treatment system for the fly ash leachate and the fly ash leachate is designed, the cost of the treatment system is reduced by using the common device, and the integral treatment process is improved corresponding to the common device.

Inventors

• CHEN JI
• Zhao Yineng
• Chi Yeyan
• Huang Shaoqian
• SHAO ZHIHAO
• HUANG SUNJIN
• CHENG ZIJI
• ZHOU YAOKUN
• XIE YIHAN
• Zhi Wenwu

Assignees

• 温州市环境发展有限公司

Dates

Publication Date

20260505

Application Date

20240808

Claims (4)

1. 1. The method for treating leachate in the garbage ecological landfill is characterized by comprising a landfill reservoir area, emergency household garbage leachate treatment equipment, fly ash leachate treatment equipment and a common reverse osmosis device, wherein the landfill reservoir area comprises an emergency household garbage reservoir area and a fly ash reservoir area, and a plurality of separation dams are arranged in the emergency household garbage reservoir area at intervals to form a plurality of diversion reservoir areas; The emergency household garbage leachate treatment equipment comprises a household garbage regulating tank, a water quality equalizing tank, a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank, a UF ultrafiltration device, an NF nanofiltration device, a coagulating sedimentation device, a first high-efficiency jet ozone reactor, a second high-efficiency jet ozone reactor and a sludge dewatering device; the household garbage regulating tank is communicated with pipelines of all the turning reservoir areas and respectively controls the on-off of the pipelines, the household garbage regulating tank collects household garbage leachate, pumps the household garbage leachate to the water quality balancing tank, and then sequentially flows through the primary denitrification tank, the primary nitrification tank, the secondary denitrification tank and the secondary nitrification tank to perform air blast oxygen supply, carbon source addition, denitrification reflux, heat exchange and temperature regulation between each nitrification tank and each denitrification tank; The liquid discharged from the secondary nitrification tank enters a UF ultrafiltration device, ultrafiltration concentrated water produced by the UF ultrafiltration device is connected to a primary denitrification tank, produced surplus sludge is led into a sludge dewatering device, and produced clear liquid enters an NF nanofiltration device; The concentrated solution produced by the NF nanofiltration device is led into a coagulating sedimentation device, the sludge produced by the coagulating sedimentation device is led into a sludge dewatering system, and the produced clear liquid is returned to the tank body after being treated by a second high-efficiency jet ozone reactor; the clear liquid produced by the NF nanofiltration device is detected and selectively introduced into a first high-efficiency jet ozone reactor to be treated and discharged up to the standard or introduced into a common reverse osmosis device; The fly ash leachate treatment equipment comprises a combined regulating tank, a reduction reaction tank, a neutralization reaction tank, a flocculation tank, an inclined tube precipitation tank, a sand filter, a carbon filter, a reuse water tank, a temporary storage tank, a reuse neutralization tank, an activated carbon filter and a water outlet pipeline; The combined regulating tank is communicated with the fly ash storage area and the pipeline of each transfer storage area, and is respectively controlled to be on-off, the fly ash leachate collected by the combined regulating tank is pumped into the reduction reaction tank to carry out acidification reduction reaction, then is led into the neutralization reaction tank to carry out oxidation reaction and acid-base neutralization reaction, is led into the flocculation tank to be added with a flocculating agent and a coagulant aid, is led into the inclined tube sedimentation tank to separate heavy metal sludge from waste water after flocculation, and is led into the sludge tank to be concentrated and transported outwards to be treated; introducing clear liquid of the inclined tube precipitation tank into a sand filter and a carbon filter for advanced treatment, and then entering a recycling water tank, wherein the temporary storage tank is respectively communicated with the recycling water tank, a common reverse osmosis device and a recycling neutralization tank; The common reverse osmosis device is selectively connected with clear liquid produced by the NF nanofiltration device or connected with a temporary storage tank according to the treatment capacity and the treatment period; The temporary storage pool water is pumped to a recycling neutralization tank for pH adjustment after being subjected to multistage filtration and pressurization by a common reverse osmosis device, and the effluent of the recycling neutralization tank is split into an outlet pipeline through definition detection or enters the outlet pipeline after passing through an activated carbon filter; The water outlet pipeline is provided with a PH detection device, a first return pipe, a standard discharge port, a heavy metal detection device, a second return pipe, an ammonia nitrogen detection device, a third return pipe, a lifting pump and a plurality of electric valves, wherein the first return pipe is communicated with the water outlet pipeline and the temporary storage pool and is controlled to be on-off by the PH detection device, the second return pipe is communicated with the standard discharge port and the combined regulating pool and is controlled to be on-off by the heavy metal detection device, and the third return pipe is communicated with the standard discharge port and the recycling pool and is controlled to be on-off by the ammonia nitrogen detection device.
2. 2. The method for treating the leachate in the ecological landfill of garbage as claimed in claim 1, wherein the device for treating the leachate is characterized in that two groups of inclined tube settling tanks, a sand filter, a carbon filter and a recycling water tank are arranged in parallel, branch pipes are arranged between the flocculation tank and the two groups of inclined tube settling tanks for communication, manual valves for controlling on-off are arranged, and the two groups of recycling water tanks are respectively communicated with the temporary storage tank.
3. 3. The method for treating leachate in a landfill according to claim 2, wherein the combined regulating reservoir is communicated with the fly ash storage area and each transfer storage area.
4. 4. The method for treating leachate treatment of a landfill of a refuse ecological landfill as claimed in claim 3, wherein the system further comprises an evaporation/distillation apparatus.

Description

Leachate treatment system for garbage ecological landfill Technical Field The invention relates to the technical field of landfill leachate treatment, in particular to a landfill leachate treatment system. Background The fly ash from incineration of household garbage, sludge, hazardous waste and the like can enter a landfill site for harmless landfill after being treated by various technologies and solidified and stabilized. Harmful substances such as heavy metals and dioxins contained in the fly ash can be fixed in a relatively stable form after proper stabilization-solidification treatment, so that potential threats to the environment and human health are reduced. Landfill leachate (also called landfill leachate or leachate) is high-concentration wastewater generated in the landfill process, is mainly generated by means of environmental precipitation, self-water content of garbage, garbage degradation and the like, effectively disposes landfill leachate, ensures that the effluent quality of the leachate meets the current national emission standard, and furthest reduces the negative influence of the leachate on the surrounding environment. The prior art has the problem that taking the operation experience of the factory of the applicant as an example, the household garbage can realize the full-quantity incineration disposal under the normal condition and the normal arrangement condition of the overhaul of the incineration equipment. However, in the case of a sudden failure of the incineration facility, the incineration disposal capacity is lowered, and it is necessary to face the case where the primary household garbage is deposited beyond the stock of the incineration plant during a period in which the incineration disposal amount is lowered or suspended. The excessive garbage in the period needs a temporary emergency disposal house to wait for the re-work of the incineration plant to be disposed, and two points need to be considered at the moment, namely, the excessive garbage cannot be directly transported to the sanitary landfill, and the problem of leachate generated by emergency disposal of the household garbage needs to be faced. The temporary emergency disposal site for the household garbage is additionally arranged, so that not only is the land occupied, but also the treatment process of the leachate generated by stacking the household garbage is different from the treatment process of the fly ash leachate, for example, the leachate in a fly ash reservoir area is typical high-salt low-COD fly ash leachate, and various heavy metal indexes such as hexavalent chromium, total chromium and the like in the fly ash leachate are removed. And the household garbage leachate needs to be additionally provided with a set of equipment, so that a great deal of cost is consumed. Therefore, if the fly ash landfill can be modified and designed, under the normal condition and the condition that the overhaul of the incineration equipment is normally arranged, the fly ash is mainly buried and solidified, and under the emergency condition, the corresponding household garbage is required to be buried in the fly ash landfill in an emergency mode, two sets of leachate treatment equipment are integrated, part of equipment is used in public, the land is used more efficiently, and the equipment cost is reduced. Disclosure of Invention The invention provides a leachate treatment system for a garbage ecological landfill, which aims to solve the defects of the technology. The technical scheme of the invention is that the leachate treatment system of the garbage ecological landfill comprises a landfill reservoir area, emergency household garbage leachate treatment equipment, fly ash leachate treatment equipment and a common reverse osmosis device, wherein the landfill reservoir area comprises an emergency household garbage reservoir area and a fly ash reservoir area, and a plurality of separation dams are arranged in the emergency household garbage reservoir area at intervals to form a plurality of diversion reservoir areas; The emergency household garbage leachate treatment equipment comprises a household garbage regulating tank, a water quality equalizing tank, a primary denitrification tank, a primary nitrification tank, a secondary denitrification tank, a secondary nitrification tank, a UF ultrafiltration device, an NF nanofiltration device, a coagulating sedimentation device, a first high-efficiency jet ozone reactor, a second high-efficiency jet ozone reactor and a sludge dewatering device; the household garbage regulating tank is communicated with pipelines of all the turning reservoir areas and respectively controls the on-off of the pipelines, the household garbage regulating tank collects household garbage leachate, pumps the household garbage leachate to the water quality balancing tank, and then sequentially flows through the primary denitrification tank, the primary nitrification tank, the secondary denitrification