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Method for treating landfill leachate by using iron flocculant with boron and silicic acid groups

A technology based on landfill leachate and silicic acid, applied in the fields of environmental protection and resources, can solve the problem of high cost of landfill leachate, achieve good economic value and environmental benefits, reduce treatment costs, and reduce burdens

Inactive Publication Date: 2013-01-30
UNIV OF SCI & TECH BEIJING
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of high cost of traditional treatment of landfill leachate, and to provide a kind of pretreatment of landfill leachate after entering the biochemical pool after entering the biochemical pool, so as to improve its biodegradability and reduce toxicity

Method used

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  • Method for treating landfill leachate by using iron flocculant with boron and silicic acid groups

Examples

Experimental program
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Effect test

Embodiment

[0018] Step 1: Add 250mg / L high-efficiency flocculant into the flocculation mixing tank, control the speed of the rapid stirring device to 200r / min, and stir for 2min to fully mix the flocculant and landfill leachate;

[0019] Step 2: For the fully mixed landfill leachate, control the speed of the slow stirring device to 50r / min, and the stirring time to 10min, so that the flocs grow up and better combine with the pollutants in the leachate, and then pass through the inclined tube In the sedimentation tank, the flocs are fully settled. Turbidity, COD and NH of leachate after flocculation treatment 3 -N was 2.093, 576mg / L and 42.22mg / L, and the removal rates were 97%, 48% and 18%, respectively.

[0020] Table 1 The original properties of landfill leachate

[0021]

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Abstract

The invention discloses a method for treating landfill leachate by using iron flocculant with boron and silicic acid groups and belongs to the field of resources and environment friendliness. The method is characterized by comprising the following steps of: 1, feeding iron high-efficiency composite flocculant with boron and silicic acid groups and at the concentration of 10 to 300mg / L into a flocculation and stirring tank, and quickly stirring at the stirring speed of 160 to 220r / min for 1 to 3 minutes to fully mix the flocculant and the landfill leachate; and 2, slowly stirring the landfill leachate which is fully mixed with the flocculant for 8 to 20 minutes at the stirring speed of 30 to 60r / min to ensure that floc grows, fully settling the floc by using an inclined tube settling pond, and allowing supernate to flow for the biochemical treatment process. A flocculation pretreatment step is added between adjustment and biochemical reaction, the toxic and harmful pollutant in the landfill leachate can be greatly reduced under the condition that the conventional process is not changed, the biodegradability is improved, and the load of the subsequent biochemical process is reduced.

Description

technical field [0001] The invention belongs to the field of resources and environmental protection. The method relates to an iron-based high-efficiency composite flocculant with boron and silicic acid groups, which is used in the treatment process of landfill leachate, so that the landfill leachate can be effectively obtained. processing. Background technique [0002] There are many technologies for treating landfill leachate at home and abroad, mainly including: coagulation, adsorption, stripping, biological treatment (aerobic biological treatment, anaerobic biological treatment, anaerobic-aerobic combination), chemical oxidation (catalytic wet Oxidation method, photocatalytic oxidation method, electrochemical oxidation method, Feton reagent oxidation method, etc.), membrane treatment method (reverse osmosis, nanofiltration, etc.), land treatment method (recharge treatment, artificial wetland, etc.) and the combination of corresponding methods . However, from the current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 李素芹房素珍姚娟迪娜尔·叶尔肯何赛郝英君苍大强熊国宏
Owner UNIV OF SCI & TECH BEIJING
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