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A method for denitrification of landfill leachate

A landfill leachate and denitrification technology, applied in chemical instruments and methods, microbial-based methods, biochemical equipment and methods, etc., can solve the problems of high infrastructure investment costs, large surplus sludge production, and large carbon source dosage and other problems, to achieve the effect of speeding up film formation, strengthening biological removal effect, and reducing CODcr

Active Publication Date: 2022-05-24
HANGZHOU NAXI ECOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole process of nitrification and denitrification has the problems of high aeration energy consumption, large excess sludge output, large carbon source dosage, long residence time, and high infrastructure investment costs

Method used

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  • A method for denitrification of landfill leachate
  • A method for denitrification of landfill leachate
  • A method for denitrification of landfill leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of modified starch:

[0045] The starch was weighed and placed in a three-necked flask, 20 mL of dimethylacetamide (DMAc) was added, stirred and dispersed at room temperature, heated to 130 ° C under nitrogen protection to form a homogeneous solution, and then added DMAP (with a mass ratio of starch of 0.1: 1) Activating the hydroxyl group for 1 h, while mixing 3-nitro-4-methylamino-benzoyl chloride (the molar ratio of 3-nitro-4-methylamino-benzoyl chloride and starch glucose group is 0.6:1) In DMAc, add dropwise to the homogeneous solution after the activated hydroxyl group, react at 100 °C, after the end, add the solution dropwise to 10 times excess ice ethanol to precipitate the product, and wash with ethanol three times to collect the final product, put it in a vacuum The modified starch was obtained by drying in a drying oven for 48 hours, and the yield was 87.4%.

[0046] Preparation of Biofillers:

[0047] Using water-soluble polyurethane (WPU) solu...

Embodiment 2

[0049] The difference between the preparation of modified starch and Example 1 is that the molar ratio of 3-nitro-4-methylamino-benzoyl chloride to starch glucose group is 0.7:1, and the yield is 82.5%.

[0050] The preparation of biofiller was the same as in Example 1.

Embodiment 3

[0052] The difference between the preparation of modified starch and Example 1 is that the molar ratio of 3-nitro-4-methylamino-benzoyl chloride to starch glucose group is 0.65:1, and the yield is 85.1%.

[0053] The preparation of biofiller was the same as in Example 1.

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Abstract

The invention discloses a method for denitrifying landfill leachate and relates to the technical field of landfill leachate treatment. The denitrification method includes: bacterial strain cultivation, performing first-level slope culture and second-level liquid culture on denitrifying Paracoccus, nitrifying bacteria, and Pseudomonas aeruginosa respectively to obtain a microbial bacterial liquid, and then mixing to obtain a composite microbial bacterial liquid, Centrifuge to remove the supernatant to obtain bacteria, and then mix it with the anaerobic sludge before biochemical landfill leachate to obtain strains; strain activation: place the seed strains at the bottom of the biochemical filter and add the above-mentioned fillers; Up-out method passes through the biochemical filter for activation; landfill leachate denitrification: stop passing the activated wastewater, add carbon source to the landfill leachate, and pass the landfill leachate through the bottom-in and top-out way for denitrification treatment. The denitrification method provided by the invention can directly perform rapid biological denitrification on biochemical effluent of landfill leachate with low carbon-to-nitrogen ratio, and can further reduce the CODcr of the effluent at the same time.

Description

technical field [0001] The invention belongs to the technical field of landfill leachate treatment, in particular to a landfill leachate denitrification method. Background technique [0002] Landfill leachate, also known as leachate water or leachate, refers to the sewage produced by fermentation, leaching and scouring of rainwater, and immersion of surface water and groundwater during the process of stacking and landfilling. Landfill leachate treatment is a recognized problem at home and abroad, especially the implementation of the new standard "GB16889-2008" and "Standards for Pollution Control of Domestic Waste Landfills" has put forward higher requirements for the treatment of landfill leachate. Generally speaking, the landfill leachate industry has high COD cr and total nitrogen, where COD cr The total nitrogen is generally more than 1000mg / L. At present, the treatment of leachate at home and abroad is mainly based on biochemical + membrane separation treatment techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/10C02F3/34C02F1/28C08B31/04C12N1/38C12N1/20C02F101/30C02F101/10C02F101/16C12R1/385C12R1/01
CPCC02F3/108C02F3/34C02F1/286C08B31/04C12N1/38C12N1/20C02F2101/30C02F2101/101C02F2101/16C02F2303/02C02F2305/06Y02W10/10
Inventor 徐坚麟付源王振娥邱正庚
Owner HANGZHOU NAXI ECOLOGICAL TECH CO LTD
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