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Method for removing phosphate in sewage by photo-catalytic reduction

A phosphate and photocatalytic technology, which is applied in chemical instruments and methods, light water/sewage treatment, water/sewage treatment, etc., can solve the problem of photocatalytic reduction of phosphate in sewage that has not yet been seen, and achieve low equipment cost and excellent reaction conditions Gentle, process-friendly effect

Inactive Publication Date: 2009-12-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there is no report on the photocatalytic reduction of phosphate in sewage

Method used

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Embodiment 1

[0023] A method for photocatalytic reduction of phosphate in sewage, comprising the steps of:

[0024] 1) Urban sewage is pretreated to remove suspended solids (can remove most suspended solids) to obtain pretreated sewage (urban sewage); first measure the mass content of phosphate in the pretreated sewage; then press the pretreatment The ratio of phosphate and nano-semiconductor photocatalyst in the post-treatment sewage is 1g: 15g, select the pre-treated sewage and nano-semiconductor photocatalyst; and add the pre-treated sewage to the photocatalytic reactor; Add nano-semiconductor photocatalyst into the reactor, and form a mixture in the photocatalytic reactor; the nano-semiconductor photocatalyst is an oxide semiconductor (such as titanium dioxide);

[0025] 2) The mixture in the photocatalytic reactor (consisting of pretreated sewage and nano-semiconductor photocatalyst) is irradiated with a 20W ultraviolet lamp, and stirred with a stirrer for 30 minutes under the conditi...

Embodiment 2

[0029] A method for photocatalytic reduction of phosphate in sewage, comprising the steps of:

[0030] 1) The phosphate-containing industrial wastewater is pretreated to remove suspended solids (most of which can be removed) to obtain pretreated sewage; first measure the mass content of phosphate in the pretreated sewage; then press the pretreatment The ratio of phosphate and nano-semiconductor photocatalyst in the post-treatment sewage is 1g: 15g, select the pre-treated sewage and nano-semiconductor photocatalyst; and add the pre-treated sewage to the photocatalytic reactor; Nano-semiconductor photocatalyst is added in the reactor, and a mixture is formed in the photocatalytic reactor; the nano-semiconductor photocatalyst is doped oxide semiconductor (such as tin oxide);

[0031] 2) The mixture in the photocatalytic reactor (composed of pretreated sewage and nano-semiconductor photocatalyst) is irradiated with a 120W high-pressure mercury lamp, and stirred with nitrogen (the ...

Embodiment 3

[0035]A method for photocatalytic reduction of phosphate in sewage, comprising the steps of:

[0036] 1) The polluted surface water (lake water) sewage is pretreated to remove suspended solids (most of which can be removed) to obtain pretreated sewage; first measure the mass content of phosphate in the pretreated sewage; then According to the ratio of phosphate and nano-semiconductor photocatalyst in the pretreated sewage to be 1g: 15g, select the pretreated sewage and nano-semiconductor photocatalyst; and add the pretreated sewage to the photocatalytic reactor; Add nano-semiconductor photocatalyst to photocatalytic reactor, form mixture in photocatalytic reactor; Described nano-semiconductor photocatalyst is sulfide semiconductor (such as cadmium sulfide etc.);

[0037] 2) The mixture in the photocatalytic reactor (composed of pretreated sewage and nano-semiconductor photocatalyst) is irradiated with natural light, and stirred with a stirrer for 30 minutes under the condition...

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Abstract

The invention relates to a method for removing phosphate in sewage, in particular to a method for removing phosphate in sewage by photo-catalytic reduction; the method is characterized in that: the method comprises the following steps: 1) suspended matters in sewage are removed by pre-treatment; and then the sewage after pre-treatment is added in a photo-catalytic reactor according to the proportion of 1 g : (1 to 100g) of the phosphate in sewage after pre-treatment and nanometer semiconductor photo-catalysts, and then the nanometer semiconductor photo-catalysts are added; 2) the mixture in the photo-catalytic reactor is irradiated by a light source and is stirred for 1 to 480 minutes; the stirring operation is kept and hole trapping agents are added in the e photo-catalytic reactor, and the adding amount of the hole trapping agents is 0.01 to 20 times of the mass of the phosphate in the sewage after the pre-treatment, stirring is carried out for 1 to 60 minutes continuously; 3) the stirring is stopped, and the mixed liquid B formed by sewage, nanometer semiconductor photo-catalysts and the hole trapping agents is precipitated for 10 to 120 minutes, then filtration is carried out, and the filter liquid is discharged or recycled. The method has simple process operation and low cost.

Description

technical field [0001] The invention relates to a method for removing phosphate in sewage. Background technique [0002] The current wastewater phosphorus removal methods mainly include physical methods (such as adsorption), chemical methods (such as coagulation and sedimentation) and biological methods. If it is based on whether the phosphate is reduced to pH 3 It can also be divided into transfer type and reduction type. The characteristic of the transfer type sewage phosphorus removal process is that the valence state of phosphorus has not changed, and most of them are transferred from the liquid phase (sewage) to the solid phase (such as adsorbent, flocculant or activated sludge, etc.), and phosphorus may be produced. secondary pollution. The main feature of the reduction phosphorus removal process is that the phosphate is reduced, even reduced to PH 3 , and escape from the water, enter the biochemical cycle of the earth or be comprehensively utilized. The reduction...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/32C02F1/58C01B25/06
Inventor 夏世斌张义
Owner WUHAN UNIV OF TECH
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