CN212504490U

CN212504490U - Landfill leachate treatment device

Info

Publication number: CN212504490U
Application number: CN202021791051.8U
Authority: CN
Inventors: 熊鹰扬
Original assignee: Jiangxi Green Shield Environmental Engineering Co ltd
Current assignee: Jiangxi Green Shield Environmental Engineering Co ltd
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-02-09
Anticipated expiration: 2030-08-25

Abstract

The utility model discloses a landfill leachate treatment device, including decarbonization subassembly, fenton oxidation reactor, deamination device and biochemical reactor, the decarbonization subassembly is collected and dewatering device including acidification device, carbon dioxide collection device, dross, and biochemical reactor includes pH equalizing basin, leading good oxygen pond, oxygen deficiency pond, terminal good oxygen pond, aeration equipment and nitrifies liquid reflux unit. The landfill leachate treatment device recovers humic acid by utilizing the acidification characteristic of the humic acid; recovering ammonia to obtain ammonium sulfate, ammonium chloride or ammonia water as side product; the load of biochemical treatment is effectively reduced and the biodegradability is improved through decarburization, Fenton and deamination; the pH value of the carbon dioxide removed by the decarburization component is adjusted back, and an inorganic carbon source is provided for the aerobic nitrification reaction. Realizes energy conservation, high efficiency and resource utilization, and has good economic benefit and environmental benefit.

Description

Landfill leachate treatment device

Technical Field

The utility model relates to the technical field of waste water, specifically a landfill leachate treatment device.

Background

The sanitary landfill process is simple, the treatment cost is low, the process is the mainstream process of domestic garbage disposal for a long time in the past, due to the fact that land is in short supply and the environmental risk of garbage landfill is increasingly prominent, with the implementation of garbage classified collection, resource utilization technologies such as garbage incineration and the like become the main means of the domestic garbage disposal. However, landfill still has a long-term impact on the environment, either due to the expiration of service or when the landfill is no longer in place. The landfill leachate has the characteristics of aging, alkalinity, high carbonate alkalinity, general pH of 7.5-8.5, high salt content, high ammonia nitrogen content and poor biodegradability. The original treatment facilities can not realize the standard discharge of the landfill leachate.

Common processing techniques are: AO + double-membrane process, high-pressure butterfly membrane process and MVR process. Wherein AO + two membrane technology, improve sludge concentration through the MBR milipore filter, thereby improve biochemical removal effect, hold back through receiving and straining or RO and get rid of organic matter such as humus, biochemical denitrification denitrogenation effect is unstable, the retentivity of membrane to ammonia nitrogen and nitro-nitrogen is limited, ammonia nitrogen and total nitrogen are difficult to stabilize up to standard, butterfly membrane module flow is short, the runner is wide, difficult emergence membrane pollution is handling high concentration pollutant and has obvious advantage, however because dense water recharge landfill, cause difficult degradation organic matter accumulation such as filtration liquid salinity and humus, MVR then need additionally provide the heat source, and evaporation mother liquor is difficult to deal with.

Disclosure of Invention

An object of the utility model is to provide a landfill leachate processing apparatus to the above-mentioned technology that provides in solving above-mentioned background art is difficult to adapt to the problem of the processing demand of old landfill leachate.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a landfill leachate treatment device, includes decarbonization subassembly, fenton oxidation reactor, deamination device and biochemical reactor, the decarbonization subassembly is collected and dewatering device including acidification device, carbon dioxide collection device, dross, fenton oxidation reactor includes that ferrous throws the device, hydrogen peroxide solution throws the device, the oxidation reaction groove, pneumatic stirring and waste gas collection device, lime breast dispenses and charge device, PAM charge device and coagulating sedimentation tank, deamination device includes precision filter, deamination membrane module and ammonia absorption assembly, biochemical reactor includes the pH equalizing basin, leading good oxygen pond, the oxygen deficiency pond, terminal good oxygen pond, aeration equipment and nitration liquid reflux unit.

Preferably, the acid adding device comprises an acid solution tank, a metering pump and a pH meter; the carbon dioxide collection comprises negative pressure suction and blast aeration; the scum collection comprises a filter pressing device and natural drying.

Preferably, the precision filter adopts a tubular ceramic membrane, a plate-type ceramic membrane or a polymer sintered filter element filter.

Preferably, the decarbonization assembly, the Fenton oxidation reactor and the waste gas collecting device are connected with a pH adjusting tank of the biochemical reactor; the water outlet pipe of the decarburization component is connected with a pH adjusting tank of the biochemical reactor.

Compared with the prior art, the beneficial effects of the utility model are that: the landfill leachate treatment device recovers humic acid by utilizing the acidification characteristic of the humic acid; recovering ammonia to obtain ammonium sulfate, ammonium chloride or ammonia water as side product; the load of biochemical treatment is effectively reduced and the biodegradability is improved through decarburization, Fenton and deamination; the pH value of the carbon dioxide removed by the decarburization component is adjusted back, and an inorganic carbon source is provided for the aerobic nitrification reaction. Realizes energy conservation, high efficiency and resource utilization, and has good economic benefit and environmental benefit.

Drawings

Fig. 1 is the utility model relates to a landfill leachate treatment device flow structure sketch map.

In the figure: 1. decarbonization subassembly, 2, fenton oxidation reactor, 3, deamination device, 4, biochemical reactor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a landfill leachate treatment device comprises a decarburization component 1, a Fenton oxidation reactor 2, a deamination device 3 and a biochemical reactor 4, wherein the decarburization component 1 comprises an acid adding device, a carbon dioxide collecting device and a scum collecting and dehydrating device; the acid adding device comprises an acid solution tank, a metering pump and a pH meter; the decarbonizing component 1 is added with dilute hydrochloric acid and sulfuric acid; adjusting the pH value to 2-3, and collecting carbon dioxide by adopting negative pressure suction and blast aeration; the scum collection comprises a filter pressing device and natural drying, and the Fenton oxidation reactor 2 comprises a ferrous iron feeding device, a hydrogen peroxide feeding device, an oxidation reaction tank, a pneumatic stirring and waste gas collecting device, a lime milk dispensing and dosing device, a PAM dosing device and a coagulating sedimentation tank; the iron salt added in the Fenton oxidation reactor 2 comprises but is not limited to ferrous sulfate, ferrous chloride or zero-valent iron, and hydrogen peroxide is added; adjusting the pH of the coagulating sedimentation to 10-11.5 by using sodium hydroxide or calcium hydroxide, and adding PAM and PAC deamination devices 3 comprising precision filters, deamination membrane components and ammonia absorption components; the precision filter adopts a tubular ceramic membrane, a plate-type ceramic membrane or a polymer sintered filter element filter, wherein the precision filter has the filtering precision of 50-500 nm; the deamination membrane absorbs ammonia nitrogen by adopting sulfuric acid, hydrochloric acid or water, and the biochemical reactor 4 comprises a pH adjusting tank, a front aerobic tank, an anoxic tank, a tail-end aerobic tank, an aeration device and a nitrifying liquid reflux device; wherein the pH adjusting tank adopts carbon dioxide removed by the decarburization component 1 and effluent water obtained in the step S1 to neutralize the pH value to 7-8.5; the effluent of the terminal aerobic tank flows back to the anoxic tank, and the decarburization component 1, the Fenton oxidation reactor 2 and the waste gas collecting device are connected with a pH adjusting tank of the biochemical reactor 4; the water outlet pipe of the decarburization component 1 is connected with a pH adjusting tank of the biochemical reactor 4.

The steps of the landfill leachate treatment device are as follows:

s1: the landfill leachate enters a decarburization component 1, the pH is adjusted to 2-3 by adding dilute hydrochloric acid, the removed carbon dioxide is collected by negative pressure suction, and the gas containing the carbon dioxide is introduced into a pH adjusting tank at the front end of a biochemical reactor 4 in the step S4; separating out scum, collecting and drying the scum, and comprehensively utilizing the scum;

s2: adding ferrous chloride, zero-valent iron and hydrogen peroxide into the effluent obtained in the step S1, and oxidizing and degrading organic matters by utilizing the strong oxidizing property of the Fenton reagent; adding lime milk, PAC and PAM, removing residual ferrous and ferric ions in the wastewater through coagulating sedimentation, and adjusting the pH value to 10-12;

s3: step S2, the effluent enters a deamination device 3, and the residual particles and colloid in the water are removed through a precision filter; entering a deamination membrane component, absorbing ammonia gas by using dilute sulfuric acid, dilute hydrochloric acid and clear water, and recovering ammonium salt or ammonia water;

s4: the effluent water of the step S3 enters a biochemical reactor 4, firstly enters a pH adjusting tank, and is neutralized to pH 7-8.5 by the carbon dioxide removed in the step S1 and the effluent water of the step S1; the sewage enters a preposed aerobic tank, residual ammonia nitrogen and degraded COD are removed by aerobic nitrification, total nitrogen and COD are removed by denitrification of an anoxic tank, and deep nitrification of a tail-end aerobic tank is performed and then the sewage flows back to the anoxic denitrification.

Example 1

The method adopts the biochemical treatment processes of decarburization, Fenton oxidation, coagulating sedimentation, precise filtration, deamination and OAO, and the treatment scale is designed to be 50 t/d. After being treated by the decarbonization device, the sewage is 1121 mg/L of COD, 912 mg/L of ammonia nitrogen and 1520 mg/L of TN; after Fenton oxidation and precipitation, COD is 326 mg/L, ammonia nitrogen is 896 mg/L, and TN is 1510 mg/L; the ammonia-removing process effluent COD is 304 mg/L, the ammonia nitrogen is 23 mg/L, and TN 620 mg/L; COD of effluent of the OAO biochemical treatment process is 80mg/L, ammonia nitrogen is 10 mg/L, and TN is 30 mg/L. Reaches the discharge standard of the pollution control standard of the domestic refuse landfill (GB 16889-2008).

TABLE 1 quality of percolate from certain refuse landfill

The working principle is as follows: when the landfill leachate treatment device is used, firstly, introducing landfill leachate into the decarburization component 1, adjusting the pH to 2-3 by adding dilute hydrochloric acid, collecting removed carbon dioxide by negative pressure suction, and introducing carbon dioxide-containing gas into a pH adjusting tank at the front end of the biochemical reactor 4 in the step S4; separating out scum, collecting, drying and comprehensively utilizing, wherein COD (chemical oxygen demand) of effluent is 800 mg/L; then adding ferrous chloride and hydrogen peroxide into the effluent of the step S1, and oxidizing and degrading the organic matters by utilizing the strong oxidizing property of the Fenton reagent; adding lime milk PAM to remove residual ferrous and ferric ions in the wastewater through coagulating sedimentation, and adjusting the pH to 10-12, wherein the COD is less than 200-300 mg/L; then the water discharged from the step S2 enters a deamination device 3, and is firstly filtered by a precision filter to remove residual particles and colloid in the water; entering a deamination membrane component, and recovering ammonium chloride by using dilute hydrochloric acid; finally, the effluent water of the step S3 enters biochemical integration, and firstly enters a pH adjusting tank, and the pH is neutralized to 7-8.5 by using the carbon dioxide removed in the step S1 and the effluent water of the step S1; the garbage leachate treatment device enters a preposed aerobic tank, residual ammonia nitrogen and degraded COD are removed by aerobic nitrification, total nitrogen and COD are removed by anoxic tank denitrification, and the tail end aerobic tank is deeply nitrified and then flows back to anoxic denitrification, so that the garbage leachate treatment device is used.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a landfill leachate processing apparatus, includes decarbonization subassembly (1), fenton oxidation reactor (2), deamination device (3) and biochemical reactor (4), its characterized in that: the decarburization component (1) comprises an acid adding device, a carbon dioxide collecting device and a scum collecting and dehydrating device; the Fenton oxidation reactor (2) comprises a ferrous iron feeding device, a hydrogen peroxide feeding device, an oxidation reaction tank, a pneumatic stirring and waste gas collecting device, a lime milk dispensing and dosing device, a PAM dosing device and a coagulating sedimentation tank; the deamination device (3) comprises a precision filter, a deamination membrane component and an ammonia absorption component; the biochemical reactor (4) comprises a pH adjusting tank, a front aerobic tank, an anoxic tank, a tail end aerobic tank, an aeration device and a nitrifying liquid reflux device.

2. The landfill leachate treatment plant of claim 1, wherein: the acid adding device comprises an acid solution tank, a metering pump and a pH meter; the carbon dioxide collection comprises negative pressure suction and blast aeration; the scum collection comprises a filter pressing device and natural drying.

3. The landfill leachate treatment plant of claim 1, wherein: the precision filter adopts a tubular ceramic membrane, a plate-type ceramic membrane or a polymer sintered filter element filter.

4. The landfill leachate treatment plant of claim 1, wherein: the decarbonization component (1), the Fenton oxidation reactor (2) and the waste gas collecting device are connected with a pH adjusting tank of the biochemical reactor (4); the water outlet pipe of the decarburization component (1) is connected with a pH adjusting tank of the biochemical reactor (4).