Landfill leachate treating process

A landfill leachate and treatment process technology, which is applied in the field of sewage treatment, can solve problems such as contradictions, and the difficulty of synchronously improving the effect of nitrogen and phosphorus removal, and achieve the effects of improving treatment capacity, solving the contradiction of mud age, and prolonging the service life

Pending Publication Date: 2020-07-24
杭州康诺环境技术工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since biological denitrification and phosphorus removal are carried out by two types of completely different microorganisms, the biochemical process has different requirements on environmental factors, so A in this invention 2 The / O process is facing contradictions in carbon source, sludge age, etc., and it is difficult to simultaneously improve the effect of nitrogen and phosphorus removal

Method used

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  • Landfill leachate treating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 , using the treatment process of landfill leachate disclosed in the present invention to treat the landfill leachate of a landfill in Hangzhou, the COD of the landfill leachate Cr The concentration is 11802mg / l, BOD 5 The concentration is 6207mg / l, the concentration of ammonia nitrogen is 1689mg / l, the concentration of total nitrogen is 2600mg / l, the concentration of total phosphorus is 79mg / l, and the concentration of heavy metals is within the limit that does not affect biochemistry.

[0043] After the following process:

[0044] 1. Pretreatment unit: (1) Firstly, the above-mentioned landfill leachate is filtered by a grid to remove large particles and then discharged into the coagulation sedimentation tank, and chemicals are added to the leachate. The agent is polyaluminum chloride (PAC) as a flocculant 300g / l, ferrous sulfate 60g / l and 2.0g / l coagulant polyacrylamide (PAM) for coagulation and sedimentation, the hydraulic retention time HRT is 12h, the...

Embodiment 6

[0055](1) First, the above-mentioned landfill leachate is filtered out of large particles with a grid and then discharged into the coagulation sedimentation tank. The pH value of the coagulation sedimentation tank is adjusted to 6.0, and the temperature of the coagulation sedimentation tank is adjusted to 48 ° C. Dosing agent, the agent is polyaluminum chloride (PAC) 100g / l flocculant, ferrous sulfate 100g / l and 2.5g / l coagulant polyacrylamide (PAM) for coagulation and sedimentation, the hydraulic retention time HRT is After 12 hours, the sludge after coagulation and sedimentation is passed into the thickening tank and processed by plate and frame pressure filtration to obtain supernatant and sludge, and the sludge is dehydrated and dried.

Embodiment 7

[0057] (1) Firstly, the above-mentioned landfill leachate is filtered out of large particles with a grid and then discharged into the coagulation sedimentation tank. The pH value of the coagulation sedimentation tank is adjusted to 6.4, and the temperature of the coagulation sedimentation tank is adjusted to 30°C. Dosing agent, the agent is polyaluminum chloride (PAC) 125g / l flocculant, ferrous sulfate 84g / l and coagulant polyacrylamide (PAM) 1.7g / l for coagulation and sedimentation, the hydraulic retention time HRT is After 12 hours, the sludge after coagulation and sedimentation is passed into the thickening tank and processed by plate and frame pressure filtration to obtain supernatant and sludge, and the sludge is dehydrated and dried.

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Abstract

A landfill leachate treating process comprises the following steps: (1) filtering out suspended solids and impurities from landfill leachate, discharging the landfill leachate into a coagulative precipitation tank, carrying out coagulative precipitation on the leachate, and introducing sludge into a sludge concentration tank to obtain supernatant; (2) injecting the supernatant into a hydrolysis acidification pool to obtain a treating liquid I; (3) conveying the treating liquid I to a first-stage A / O pool, and controlling the DO to be 0.01-4.0 mg / l to obtain a treating liquid III; (4) enablingthe treating liquid III to enter a secondary sedimentation tank to obtain a treating liquid IV; (5) enabling the treating liquid IV to enter a secondary A / O pool, and controlling the DO to be 0.02-5mg / l so as to obtain a treating liquid VI; (6) enabling the treating liquid VI to enter an MBR membrane tank to realize cement separation to obtain ultrafiltrate, and enabling part of the ultrafiltrateto flow back to the secondary sedimentation tank; and (7) sequentially treating the ultrafiltrate obtained in the step (6) through a nanofiltration system and a reverse osmosis system, carrying out efficient denitrification treating to obtain a nanofiltration solution and a concentrated solution, sending the concentrated solution to a Fenton advanced oxidation system, and discharging the nanofiltration solution and the concentrated solution after reaching the standard. Nitrogen and phosphorus removal is more efficient, and the service life of the process is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a process for treating landfill leachate. Background technique [0002] The leachate of urban waste landfill has complex components and is recognized as one of the most difficult to treat high-concentration organic wastewater in the world. It is mainly manifested in high concentrations of BOD and COD, and high contents of heavy metals, ammonia nitrogen and total phosphorus. Leachate is a secondary pollution source in the landfill process. If it is directly discharged into the environment without treatment, it will cause serious environmental pollution. [0003] Chinese invention patent application announcement number is that CN104118969B discloses a kind of A 2 The O-MBR sewage treatment device includes an anaerobic pool, anoxic pool, aerobic pool, and membrane pool that are interconnected in sequence, and the anoxic pool and the membrane pool are also connected. A sew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/06C02F101/30C02F101/16
CPCC02F9/00C02F2103/06C02F1/001C02F1/5236C02F1/56C02F3/302C02F3/1268C02F1/444C02F1/441C02F1/442C02F1/722C02F2305/026C02F2301/08C02F2101/30C02F2101/16
Inventor 卢文中
Owner 杭州康诺环境技术工程有限公司
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