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A method of using zero-valent nano-iron to strengthen sludge anaerobic digestion to produce methane

A zero-valent nano-iron and anaerobic digestion technology, applied in the field of solid waste recycling, can solve the problems of incomplete degradation of organic matter, low methane production efficiency, and high energy consumption, achieve low cost, improve energy recovery rate, and reduce consumption. Effect

Active Publication Date: 2018-08-28
TONGJI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to disclose a method of using zero-valent nano-iron to strengthen sludge anaerobic digestion to produce methane, which overcomes the incomplete degradation of organic matter in the traditional anaerobic digestion process, the low efficiency of methane production and the enhanced sludge pretreatment method Existing technical defects of high energy consumption and low efficiency

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  • A method of using zero-valent nano-iron to strengthen sludge anaerobic digestion to produce methane
  • A method of using zero-valent nano-iron to strengthen sludge anaerobic digestion to produce methane
  • A method of using zero-valent nano-iron to strengthen sludge anaerobic digestion to produce methane

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Embodiment 1

[0022] Embodiment 1-6, wherein the zero-valent nano-iron dosage of embodiment 1 and 2 is 0, and the zero-valent nano-iron dosage of embodiment 3,4,5,6 is successively 100 (mg / L), 300 (mg / L), 600 (mg / L) and 1000 (mg / L), the dosage of ethanol is 1 (mL) except that embodiment 1 is 0. Other processes and conditions are the same.

[0023] A. The sludge is anaerobic digested sludge from an anaerobic digester of a sewage treatment plant in Shanghai. According to the standard method, the total suspended solids concentration (SS=14.683g / L), the volatile suspended solids concentration (VSS=6.841g / L), and the total chemical oxygen demand (COD=2263mg / L) of the anaerobic digested sludge were measured. . Adjust pH≈7.

[0024] B, through N 2 When the oxidation-reduction potential (ORP) is less than -300mV (usually 30min). Then, at N 2 Under the protection, the sludge of step A is packed into embodiment 1,2,3,4,5,6 used specification respectively is 500mL, and working volume is 300mL a...

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Abstract

The invention discloses a method for methanogenesis through anaerobic sludge digestion fortified by zero-valent nano-iron and belongs to the technical field of solid waste resource recovery. Firstly, pH of anaerobic digestion sludge is regulated to be 6.8-7.2; the sludge is placed in an anaerobic reaction flask under the protection of N2, N2 is introduced till ORP is smaller than -300 mV, zero-valent nano-iron is added at the same time, the concentration of zero-valent nano-iron is made to be 100-1000 mg / L, the anaerobic reaction flask is placed in a shaking table for anaerobic digestion, the rotating speed of the shaking table is set to be 150-180 rpm, anaerobic digestion reaction lasts 15-20 days, the concentration of methane in the gas phase is measured along the way with the gas chromatographic method, methane gas output is measured with the vapor equilibration method, and then the volume of methane is obtained through calculation. According to the method, input of extract energy is not needed, and use amount is smaller and cost performance ratio is higher compared with ordinary iron powder. The method is suitable for anaerobic digestion sludge and excess sludge.

Description

technical field [0001] The invention relates to a method for using zero-valent nano-iron to strengthen sludge anaerobic digestion to produce methane. The invention belongs to the technical field of solid waste recycling. Background technique [0002] With the implementation of my country's urbanization progress, the amount of sludge generated by sewage treatment has increased sharply. According to statistics, the current annual discharge of dry sludge from urban sewage treatment plants in my country is about 1.5 million tons, and the annual growth rate is greater than 10%, accounting for 3.2% of my country's total solid waste. However, the concept of "heavy water and light mud" makes a large amount of sludge that is not fully stabilized directly discharged, and the direct discharge of sludge not only causes secondary pollution of the environment, but also causes a lot of energy waste. [0003] The sludge anaerobic digestion process is a complex organic matter degradation p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCC02F11/04Y02E50/30
Inventor 王亚宜方慧莹常青龙王晓东
Owner TONGJI UNIV
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