Preparation method of sludge extracellular polymeric substance composite nano zero-valent iron

A technology of extracellular polymers and nano-zero-valent iron, which is applied in the direction of water pollutants, nanotechnology, chemical instruments and methods, etc., can solve the problems of the preparation cost of secondary polluting microbial extracellular secretions, achieve high reduction and adsorption efficiency, Improved removal effect, easy zoom-in effect

Active Publication Date: 2022-01-14
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the surplus sludge produced in the existing sewage treatment process easily causes secondary pollution and the high cost of preparation of microbial extracellular secretions, the present invention proposes a preparation method of sludge extracellular polymer composite nano-zero valent iron

Method used

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  • Preparation method of sludge extracellular polymeric substance composite nano zero-valent iron
  • Preparation method of sludge extracellular polymeric substance composite nano zero-valent iron

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specific Embodiment approach 1

[0019] Specific embodiment one: the preparation method of sludge extracellular polymer composite nano-zero-valent iron in this embodiment is carried out according to the following steps:

[0020] 1. Preparation of sludge extracellular polymer

[0021] The activated sludge is left to settle, the supernatant is removed, and the remaining material is heated to 75-85°C in a water bath, and then anhydrous NaCO is added 3 , to obtain a mixture, stir the mixture, then centrifuge to collect the supernatant and discard the precipitate, the obtained supernatant is the extracted sludge extracellular polymer;

[0022] 2. Preparation of sludge extracellular polymer composite nano-zero valent iron

[0023] Take sludge extracellular polymer, aerate with nitrogen for 25-35 minutes, then add FeCl 3 ·6H 2 O, adjust the pH value of sludge extracellular polymer to FeCl with HCl 3 ·6H 2 O dissolved, then NaBH was added 4 The aqueous solution is stirred for 25 to 35 minutes under the protecti...

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the volume of activated sludge described in step one and anhydrous NaCO 3 The mass ratio is (199~201)mL:0.33g.

specific Embodiment approach 3

[0028] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is: when stirring the mixture in step 1, stir at a speed of 395-405 r / min for 35 minutes.

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Abstract

The invention discloses a preparation method of extracellular polymeric substance composite nano zero-valent iron, and relates to a preparation method of nano zero-valent iron. The invention aims to solve the problems that residual sludge easily causes secondary pollution and the preparation cost of microbial extracellular secretions is high are solved. The method comprises the steps of standing and precipitating the activated sludge, heating in a water bath, adding anhydrous NaCO3, centrifuging to obtain a sludge extracellular polymeric substance, adding FeCl3. 6H2O, adding a NaBH4 aqueous solution, stirring under the protection of nitrogen, and separating a solid product by utilizing a magnet. On the basis of the nano zero-valent iron and the excess sludge, the prepared sludge extracellular secretion composite nano zero-valent iron not only retains the advantages of high efficiency, applicability to treatment of heavy metal wastewater and the like of microbial extracellular secretions, but also has the specific magnetic separation characteristic and high reduction adsorption characteristic of the nano zero-valent iron, is easy to recover and high in flocculation efficiency, the reduction adsorption efficiency is high, and secondary pollution of sludge is avoided. The method is suitable for preparing the extracellular polymeric substance composite nano zero-valent iron.

Description

technical field [0001] The invention relates to a preparation method of extracellular polymer composite nanometer zero-valent iron. Background technique [0002] The rapid development of industry and agriculture in recent years has led to an increase in heavy metal emissions from more and more industries such as smelting, electroplating, chemical industry, and tanning. The increased use of pesticides and fertilizers has also led to frequent occurrence of heavy metal pollution incidents. Heavy metals cannot be biodegraded, and are easily accumulated in large quantities in organisms. Trace amounts of heavy metals in environmental media can be enriched hundreds of times or even hundreds of thousands of times in organisms, and then poison the human body through the food chain. Therefore, how to effectively control heavy metal pollution has become one of the problems to be solved in the field of environmental protection. [0003] Microbial extracellular secretions are macromolec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/28C02F3/34B22F9/24B22F1/054B22F1/102B82Y40/00C02F101/20
CPCC02F1/70C02F1/281C02F3/34B22F9/24B82Y40/00C02F2101/20
Inventor 李昂周璐邢洁杨基先汤爱琪皮姗姗
Owner HARBIN INST OF TECH
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