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Method for extracting humus acid from concentrated waste percolate and treating waste water

A technology of landfill leachate and humic acid, applied in chemical instruments and methods, sewage/sludge fertilizer, neutralized water/sewage treatment, etc., can solve the problems of large power consumption and energy waste, and achieve small investment and comprehensive The effect of using resources and process is simple

Active Publication Date: 2010-05-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of concentrated liquid mainly includes incineration, solidification, distillation and drying, and refilling, etc., but this kind of treatment has serious problems such as large power consumption and energy waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Detect the concentrated landfill leachate treated by a reverse osmosis membrane, its TOC and COD are 2584mg / L and 4285mg / L respectively; put 1L of the concentrated landfill leachate into a 2.5L beaker, stir at room temperature, and add 0.15g of polyferric sulfate coagulant, 200-300r / min rapid stirring for 2min, add 1ml 0.05% (weight concentration) coagulation aid polyacrylamide, 200-300r / min rapid stirring for 2min, slow stirring for 1min, settling for 60min ; Centrifuge at 4000r / min for 15min. The measured supernatant TOC and COD were 2196mg / L and 3513mg / L, and the removal rates reached 15% and 18%, respectively.

[0023] (2) Add hydrochloric acid to the supernatant of step (1), adjust the pH to 1.5, settle for 4.0 hours, centrifuge at 4000r / min for 15 minutes, concentrate to semi-solid in a vacuum oven at 50°C, and obtain high-concentration liquid humic acid 6.5g. As determined by the potassium dichromate oxidation method, its content is higher than 90%. After ...

Embodiment 2

[0026] (1) Detect the concentrated landfill leachate treated by a reverse osmosis membrane, its TOC and COD are 2584mg / L and 4285mg / L respectively; put 1L of the waste concentrate into a 2.5L beaker, stir at room temperature, and add 0.25 g of polyaluminum sulfate coagulant (percentage by weight), stir rapidly at 200-300r / min for 2min, add 2ml of 0.05% coagulation aid polyacrylamide, stir rapidly at 200-300r / min for 2min, stir slowly for 1min, settle for 60min ; Centrifuge at 4000r / min for 15min. The measured supernatant TOC and COD were 2158mg / L and 3492mg / L, and the removal rates reached 16.5% and 18.5%, respectively.

[0027] (2) Add hydrochloric acid to the supernatant of step (1), adjust the pH to 3.0, settle for 6.0 hours, centrifuge at 4000r / min for 15 minutes, concentrate to semi-solid in a vacuum oven at 50°C, and obtain high-concentration liquid humic acid 6.2g. As determined by the potassium dichromate oxidation method, its content is higher than 90%. After testi...

Embodiment 3

[0030] (1) Detect the concentrated landfill leachate treated by a reverse osmosis membrane. The TOC and COD are 2584mg / L and 4285mg / L respectively. Put 1L of the concentrated landfill into a 2.5L beaker, stir at room temperature, and add 0.35 g of polyferric sulfate coagulant (by weight percentage), 200-300r / min rapid stirring for 2min, add 2ml 0.05% coagulation aid polyacrylamide, 200-300r / min rapid stirring for 2min, slow stirring for 1min, settling for 60min ; Centrifuge at 4000r / min for 15min. The measured supernatant TOC and COD were 2106mg / L and 3424mg / L, and the removal rates reached 18.5% and 20.1%, respectively.

[0031] (2) Add sulfuric acid to the supernatant of step (1), adjust the pH to 1.0, settle for 8.0 hours, centrifuge at 4000r / min for 15 minutes, concentrate in a vacuum oven at 50°C to semi-solid, and obtain high-concentration liquid humic acid 10.3g. As determined by the potassium dichromate oxidation method, its content is higher than 90%. After testing...

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Abstract

The invention discloses a method for extracting humus acid from concentrated waste percolate and treating waste water, comprising the steps of adding coagulant into the concentrated waste percolate, stirring uniformly, adding coagulating agent, settling for 40 to 60 min, subsiding, separating to obtain supernatant, adjusting the PH value of supernatant to be 1.0 to 3;.0, settling for 4.0 to 8.0 h, subsiding, separating, concentrating the sediment to acquire high-concentrated liquid humus acid, and discharging after treating with advanced oxidization technique, wherein the coagulant is polymeric aluminum sulfate, polymeric ferric sulfate or polymeric ferric chloride and the coagulating agent is polyacrylamide. Treating the waste water with the method, the overall removing rates of COD and TOC are respectively above 96% and 97%, and the separated humus acid is semi-solid content which can be used as organic fertilizer to realize the comprehensive use of concentrated waste percolate and the treating target of treating pollution and changing waste into valuable.

Description

technical field [0001] The invention relates to an environment-friendly comprehensive treatment method for recycling humic acid from concentrated landfill leachate treated by a reverse osmosis membrane. Background technique [0002] At present, most of the urban waste in my country is disposed of by landfill, which will produce a large amount of landfill leachate. Landfill leachate is a liquid containing high-quality suspended solids and high-quality organic or inorganic components, which contains a considerable amount of toxic substances with high mass concentrations, and is completely discharged into rivers and lakes without treatment. The organic pollution in it Chemicals and inorganic pollutants will pollute aquatic organisms and crops, and cause harm to human health through the food chain and the ecological environment. [0003] The water quality composition and concentration of landfill leachate change with the extension of the landfill period. Generally, the pH value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G99/00C02F9/04C05F7/00C02F1/72C02F1/52C02F1/66
CPCY02A40/20
Inventor 周少奇吴彦瑜
Owner SOUTH CHINA UNIV OF TECH
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