Catalytic wet oxidation treatment method of garbage leachate

Abstract

The invention discloses a catalytic wet oxidation treatment method for up-to-standard discharge of garbage leachate. The method comprises adding aluminum-and-magnesium-containing polysilicate compoundflocculating agent into original garbage leachate for pretreatment; adding pretreated garbage leachate into a reaction vessel; putting a RFCL catalyst into the pretreated garbage leachate, wherein 20g of the RFCL catalyst is putting to one liter of garbage leachate; controlling the reaction temperature to be 300 DEG C, heating the reaction vessel to a set temperature, and leading in oxygen; andcontrolling the oxygen partial pressure of oxygen in the reaction vessel to be 3 MPa, and the catalytic wet oxidation reaction time to be 150 min. After treatment, the garbage leachate reaches the national standard GB8978-1996 ''integrated wastewater discharge standard'', CODCr of the treated garbage leachate is no higher than 500 mg / L, the chroma is no higher than 80, and pH is in a range of 7-9.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a catalytic wet oxidation treatment method for discharging landfill leachate up to the standard. Background technique [0002] With the acceleration of urbanization and rapid economic development in China, the problem of garbage disposal has become increasingly prominent. Sanitary landfill is the main waste treatment technology in my country, and the landfill leachate produced is increasingly harmful to the environment. Landfill leachate contains more than 50 kinds of organic substances, of which organic acids account for about 88%, alkanes account for about 4%, and others are heterocyclic organic substances and high concentrations of ammonia nitrogen. Since the landfill leachate has large changes in water volume and water quality, COD Cr , High concentration of ammonia nitrogen, poor biodegradability, high concentration of toxic and harmful substances, and the po...

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Problems solved by technology

[0007] Early research on catalytic wet oxidants mainly focused on homogeneous catalysts. Homogeneous catalysts have the advantages of high activity and fast reaction speed, but because the catalyst dissolves in the waste, it causes secondary pollution and requires subsequent treatment, which increases the cost of wastewater treatment.

In recent years, heterogeneous catalysts have become a research hotspot. There are mainly two types of heterogeneous catalysts: noble metals and metal oxides. Among them, noble metal-supported catalysts have high catalytic activity and stability. At present, most of these catalysts are based on TiO 2 , ZrO 2 , CeO 2 Or the two composite oxides between them are used as carriers, and Ru, Rh, Pd, Ir, Pt, Au are loaded on the above-mentioned carriers, but few of the above-mentioned catalysts are compounded for high-concentration refractory landfill leachate The research on the complete process of treatment, therefore, this application studies the complete process of high-concentration refractory landfill leachate treatment from the perspective of multi-component composite catalyst

And for the COD existing in the traditional and previous technologies of high-concentration refractory landfill leachate treatment Cr To solve the problems of low removal rate, biological bacteria poisoning, complex process, and secondary pollution, a catalytic wet oxidation treatment method for landfill leachate is provided, which has COD Cr The advantages of high removal rate, no biological bacterial poisoning and secondary pollution, and simple process flow make the landfill leachate discharge up to standard after treatment

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