Unlock instant, AI-driven research and patent intelligence for your innovation.

A pretreatment process for landfill leachate

A technology of landfill leachate and pretreatment, applied in filtration treatment, polluted groundwater/leachate treatment, water/sewage treatment, etc., can solve the blockage of DTRO membrane, increase the load of DTRO treatment system, increase sand filter backwash and The frequency of chemical flushing of the DTRO membrane and other issues can reduce the pressure

Active Publication Date: 2020-10-02
NANYANG INST OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a landfill leachate pretreatment process, which solves the problem of COD in the leachate caused by the existing pretreatment process when the content of suspended solids in the landfill leachate is high in the prior art. Cr , NH 3 The overall removal rate of -N, especially SS, is low, which leads to an increase in the load of the subsequent DTRO treatment system. The DTRO membrane, the core component of the DTRO landfill leachate treatment equipment, is clogged, which increases the frequency of sand filter backwash and DTRO membrane chemical flushing, which in turn leads to The problem of increased operating costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A landfill leachate pretreatment process, comprising the following steps:

[0029] Step 1, the raw liquid of the landfill leachate is transported to the screen filter by the lifting pump, and the suspended matter with a particle size of ≥0.5 mm is removed through the screen filter with a screen size of 20 mesh to obtain the screen filter water;

[0030] Step 2, the water from the screen filter flows into the chemical oxidation tank by itself, and the compound chemical reagent is added to the chemical oxidation tank according to the ratio of 1kg of compound chemical reagent per ton of wastewater, and the concentration is added to the chemical oxidation tank after the addition is completed. 10% dilute sulfuric acid, adjust the pH value of the whole system to 3, then stir at a speed of 300r / min for 30min, after the stirring is completed, let stand for 2h and then drain water to obtain the effluent of the chemical oxidation pool;

[0031] Wherein, the composite chemical rea...

Embodiment 2

[0036] A landfill leachate pretreatment process, comprising the following steps:

[0037] Step 1, the raw liquid of landfill leachate is transported to the screen filter by the lifting pump, and the screen filter effluent is obtained after the suspended solids with a particle size of ≥0.5 mm are removed through the screen filter with a screen size of 30 mesh;

[0038] Step 2, the water from the screen filter flows into the chemical oxidation tank by itself, and the compound chemical reagent is added to the chemical oxidation tank according to the ratio of 1.5kg of compound chemical reagent per ton of wastewater, and then added to the chemical oxidation tank after adding Concentration of 10% industrial hydrochloric acid, adjust the pH value of the whole system to 3.5, then stir at a speed of 280r / min for 40min, drain after stirring for 2.5h, and obtain the effluent of the chemical oxidation pool;

[0039] Wherein, the composite chemical reagent is composed of the following comp...

Embodiment 3

[0044] A landfill leachate pretreatment process, comprising the following steps:

[0045] Step 1, the raw liquid of the landfill leachate is transported to the screen filter by the lifting pump, and the suspended matter with a particle size of ≥0.5 mm is removed through the screen filter with a screen size of 20 mesh to obtain the screen filter water;

[0046] Step 2, the water from the screen filter flows into the chemical oxidation tank by itself, and the compound chemical reagent is added to the chemical oxidation tank according to the ratio of 2kg of compound chemical reagent per ton of wastewater, and the concentration is added to the chemical oxidation tank after the addition is completed. 10% dilute sulfuric acid, adjust the pH value of the whole system to 4, then stir at a speed of 250r / min for 60min, after the stirring is completed, let stand for 3h and then drain water to obtain the effluent of the chemical oxidation pool;

[0047] Wherein, the composite chemical rea...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a refuse leachate pretreatment process which comprises the following steps: treating by a mesh filter; treating in a chemical oxidation pool; treating in an adsorption sedimentation tank. The refuse leachate pretreatment process disclosed by the invention specifically comprises the following steps: removing large SS through the mesh filter; removing most of COD (Chemical Oxygen Demand), BOD (Biochemical Oxygen Demand) and NH3-N and one part of SS in refuse leachate by utilizing the chemical oxidation pool; finally, adsorbing the NH3-N and SS in the refuse leachate by utilizing the adsorption sedimentation tank, so that the content of the COD, BOD, NH3-N and SS in the pretreated effluent is controlled to be in a low range, and up-to-standard discharge of the effluent treated by a subsequent two-stage DTRO (Disk Tubular Reverse Osmosis) process is facilitated. In addition, the refuse leachate pretreatment process disclosed by the invention is simple in treatment process and excellent in economic benefits and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a landfill leachate pretreatment process. Background technique [0002] With the rapid development of the economy and the advancement of urbanization, the amount of urban domestic waste is also increasing year by year. The leachate of domestic waste landfills is the main pollutant produced by landfills. Landfill leachate mainly has the following two characteristics: Features: (1) The leachate has a high concentration of organic pollutants, high ammonia nitrogen concentration, high chroma, and emits a certain odor. At the same time, it generally contains a high concentration of heavy metals, relatively high salt content and more of pathogenic microorganisms. (2) The water quality changes greatly. The leachate water quality varies with the garbage composition, landfill process, landfill time, season, etc., and presents obvious non-periodic characteristics. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04B01J20/24B01J20/18B01J20/04B01J20/30C02F103/06
CPCB01J20/043B01J20/18B01J20/24C02F1/001C02F1/281C02F1/286C02F1/5236C02F1/56C02F1/66C02F1/72C02F9/00C02F2103/06
Inventor 张磊刘玉宋建阳张红胡培锋孙广娜鲁晨阳柏红强
Owner NANYANG INST OF TECH