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Flocculating agent for simulating composition of microorganism extracellular polymeric substances and application method thereof

A technology of extracellular polymer and application method, which is applied in the field of promoting the formation of non-biological granular sludge in the process of heavy metal wastewater treatment, which can solve the problems of toxicity and high price, and achieve the effects of low cost, improved settling performance and shortened time

Active Publication Date: 2014-05-21
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

However, polyacrylamide is a chemically synthesized polymer, which is expensive and has certain toxicity.

Method used

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  • Flocculating agent for simulating composition of microorganism extracellular polymeric substances and application method thereof
  • Flocculating agent for simulating composition of microorganism extracellular polymeric substances and application method thereof
  • Flocculating agent for simulating composition of microorganism extracellular polymeric substances and application method thereof

Examples

Experimental program
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Embodiment 1～3

[0020] Prepare an aqueous solution of exopolysaccharide (sodium alginate, xanthan gum or pullulan) with a concentration of 1g / L in a container, and prepare an aqueous solution of amino acid (tryptophan, tyrosine or phenylalanine) in water. Then the two aqueous solutions were mixed according to a certain ratio (Table 1), and after uniform stirring, the flocculants in Examples 1-3 were obtained.

[0021] A reaction beaker was placed on a constant temperature magnetic stirring device, and 100 mL of a suspension containing nano-ZnO seed crystals (solid concentration 1.5 g / L) was added to it. The reaction temperature is controlled at 25±1° C., and the rotating speed of the magnetic stirring bar is adjusted to 500 rpm. Then drop sodium hydroxide solution (0.01mol / L) and zinc-containing waste water (1000mg / L) respectively in the beaker simultaneously, control the dropping rate of heavy metal waste water to be 2.5mL / min, by adjusting the precipitating agent sodium hydroxide solution ...

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Abstract

The invention relates to a flocculating agent for simulating composition of microorganism extracellular polymeric substances and an application method thereof. The flocculating agent is formed by compounding microorganism exopolysaccharides (sodium alginate, xanthan gum and pulullan) and hydrophobic amino acid (tryptophan, tyrosine and phenylalanine), the weight ratio (ammonia acid / polysaccharide) is 2-8, the optimal ratio is 8, and the concentration of the flocculating agent in the system when in charging is controlled at 20-40mg / L. The flocculating agent has the characteristics that the bridging attraction effect of the exopolysaccharide and the hydrophobic attraction effect of the hydrophobic amino acid can be adequately played after all components are compounded, so that the formation of non-biological particle sludge in the heavy metal waste water treatment process can be effectively promoted by integrating the bridging attraction effect and the hydrophobic attraction effect. Compared with the flocculent sludge, the flocculating agent has the advantages that the settleability of the non-biological particle sludge can be increased by 2-5 times, and the weakness of the difficulty in solid-liquid separation in the heavy metal waste water treatment process and toxicity and harm of the traditional macromolecular flocculating agent can be overcome.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a flocculant simulating the composition of microbial extracellular polymers and a method for promoting the formation of non-biological granular sludge in the process of heavy metal wastewater treatment. Background technique [0002] In the process of heavy metal wastewater treatment, the sedimentation and separation performance of the sludge is a very important indicator. If the sedimentation and separation effect of the generated sludge is poor, it is easy to cause the sludge to dissolve in the subsequent sedimentation and transportation process, and the heavy metals in the sludge It will return to the supernatant, which will increase the concentration of heavy metals and turbidity in the effluent, seriously affecting the treatment effect. At present, the sludge produced in the process of heavy metal wastewater treatment is generally flocculent, and...

Claims

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Application Information

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IPC IPC(8): C02F1/56C02F1/62
Inventor 柴立元李青竹颜旭王庆伟闵小波杨卫春王海鹰
Owner CENT SOUTH UNIV
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