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Method using disc-tube reverse osmosis integration technology for treating landfill leachate

A disc tube type reverse osmosis and landfill leachate technology, which is applied in the field of water treatment, can solve the problems of no further treatment of the concentrated liquid, no recovery of useful substances in the concentrated liquid, etc., and achieve the effect of avoiding re-pollution

Inactive Publication Date: 2019-01-15
烟台金正环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems in the prior art that the concentrated solution of landfill leachate separated by membrane is not further processed, and useful substances in the concentrated liquid are not recovered, etc., and provides a method for treating landfill leachate by adopting disc tube type reverse osmosis integration technology, Including the following steps:

Method used

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  • Method using disc-tube reverse osmosis integration technology for treating landfill leachate
  • Method using disc-tube reverse osmosis integration technology for treating landfill leachate

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The leachate of a domestic waste landfill is turbid and has a large amount of suspended solids. Its conductivity is 20,000 μS / cm, and its COD cr : 5680 mg / L. Permeate treatment capacity is 150 m 3 / d. Its processing includes the following steps:

[0026] Add acid to adjust the pH of the landfill leachate stock solution, and then enter the quartz sand filter with a filtration accuracy of 50 μm. The sand filter backwash cycle is 80 hours. Add 5 ppm antiscalant to the sand filtered water, and then enter the core filter (accuracy: 10μm). The filtered effluent enters the two-stage DTRO system, and the effluent of the two-stage DTRO reaches the standard discharge, the pH of the effluent: 6.8, COD cr : 16 mg / L, the conductivity was not detected, and the recovery rate: 80%. The two-stage DTRO concentrate enters the three-effect forced circulation evaporator for further concentration, removes 75% of the water, and obtains high-concentration waste liquid and miscellaneous s...

Embodiment 2

[0031] A landfill leachate, raw water quality indicators: pH: 7.84, total hardness: 3000 mg / L, calcium hardness: 1400 mg / L, alkalinity: 11600 mg / L, conductivity: 38000 us / cm. Chromaticity: 1800~2000. Permeate treatment capacity is 300 m 3 / d. Its processing includes the following steps:

[0032] Add acid to adjust the pH of the landfill leachate stock solution, and then pass through sand filter + core filter. The sand filter has a filtration accuracy of 100 μm, and the core filter accuracy: 10 μm. The sand filter backwash cycle is about 120 hours. Add 10 ppm antiscalant to sand filter water. The filtered effluent enters the two-stage DTRO system, the operating pressure is 65 bar, the effluent of the two-stage DTRO reaches the standard discharge, and the recovery rate is 70%. The two-stage DTRO concentrate is sprayed into the combustion furnace, and natural gas is used as the auxiliary fuel for combustion treatment at a temperature of 900-1000 degrees Celsius to remove org...

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Abstract

The invention belongs to the field of water treatment, and in particular relates to a method using a disc-tube reverse osmosis integration technology for treating landfill leachate. The method comprises the following steps: pre-treating, allowing filter-effluent to enter two-stage DTRO for concentrating and filtering, incineration or submerged combustion, and impurity salt treatment steps. Compared with membrane bioreactor (MBR) + nanofiltration (NF) / reverse osmosis (RO), pretreatment + DTRO and other processes, the method has a more integrated system, simpler pretreatment, smaller land area, higher recovery rate and lower running cost on the premise of effluent reaching standards. The problem that high-concentration waste liquid is difficult to treat after a reverse osmosis concentratedliquid is evaporated is solved, impurity salts can be recycled, and the purpose of near zero discharge and recycling is achieved.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for treating landfill leachate by adopting a disc tube type reverse osmosis integrated technology. Background technique [0002] The water quality of landfill leachate is affected by factors such as waste composition, treatment scale, precipitation, climate, landfill process and service life of the landfill, and usually has the following characteristics: water quality changes greatly, organic matter (proteins, polysaccharides, decay phytic acid, tannic acid, animal and vegetable oils, petroleum, etc.), high concentrations of some heavy metal ions (chromium, nickel, cadmium, lead, arsenic, mercury, etc.), salt (sodium chloride, potassium chloride, sodium sulfate, Potassium sulfate, calcium sulfate, magnesium sulfate, etc.) with high content and imbalanced nutrient ratio, etc., belong to a kind of high-concentration and difficult-to-treat organic wastewater with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D5/16C01D3/14C02F103/06
CPCC01D3/14C01D5/16C02F1/001C02F1/04C02F1/441C02F9/00C02F2103/06C02F2301/08
Inventor 李越彪苗晶林会杰张卓王有柱孙金琨徐会旌彭金山
Owner 烟台金正环保科技有限公司
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