Electrically enhanced internal anaerobic zero-valent iron reactor

An anaerobic reactor and zero-valent iron technology, applied in the field of water treatment, can solve the problems of long start-up period of anaerobic reactor, poor treatment performance, and easy to be interfered by other environmental factors, so as to overcome the deactivation of zero-valent iron phenomenon, promotion of redox process, acceleration of aggregation and metabolism

Inactive Publication Date: 2010-12-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the shortcomings of the anaerobic reactor such as long start-up period, being easily disturbed by other environmental...

Method used

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  • Electrically enhanced internal anaerobic zero-valent iron reactor
  • Electrically enhanced internal anaerobic zero-valent iron reactor
  • Electrically enhanced internal anaerobic zero-valent iron reactor

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Experimental program
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Embodiment 1

[0024] The above reactor was started and acclimatized with synthetic glucose wastewater see image 3 and Figure 4. It can be seen that under the condition of no voltage, the first 23 days of the reactor start-up, when the influent COD concentration is 1500 to 2500mg / L, the COD removal rate is basically lower than 60%. On the 24th day, the applied voltage of 1.4V was applied to the reactor, and the sewage treatment efficiency was rapidly increased to more than 90%. After running for 36 days, the influent COD is 7500mg / L, and the COD removal rate reaches over 95%, which realizes the rapid start-up of the reactor.

Embodiment 2

[0026] The situation of this reactor treating synthetic printing and dyeing wastewater under the condition of applied voltage is shown in Figure 5 During the period, it maintained stable operation. When the COD concentration in the influent water was around 5500mg / L, and when the dye concentration reached 800mg / L, the COD removal rate remained above 85%. Figure 6 It was shown that the average color removal rate remained above 80%.

Embodiment 3

[0028] From Figure 7 It can be seen that with the operation of the reactor, the particle size of the sludge in the reactor increases significantly, from the initial particle size of 152 microns to 381 microns on the 41d, indicating that the electro-enhanced anaerobic reactor can granulate the sludge The effect is obvious. At this time, the sedimentation rate of the sludge reaches 60m / h, and the iron content is about 3.5%.

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Abstract

The invention discloses an electrically enhanced internal anaerobic zero-valent iron reactor, belonging to the technical field of water treatment. Two graphite electrodes are arranged inside an anaerobic reactor and connected with an external direct current regulated power supply through a wire to simulate growth of microorganisms; meanwhile, the oxidation reduction process of the graphite electrodes also strengthens reductive decoloration of azo dyes. The graphite electrodes are arranged in the anaerobic internal biological zero-valent iron reactor, dissolution of iron is regulated by applying micro-voltage, and the buffer capacity of the reactor to acidification is strengthened. Coupling of an external power supply and zero-valent iron can also accelerate sludge granulation, efficiently enhance the decomposition capacity to organic compounds and realize rapid starting and high-efficiency running of the anaerobic reactor. A bench scale experiment shows that after the micro-voltage is applied, the rapid starting and the sludge granulation of the anaerobic reactor can be realized within 41 days, and the electrically enhanced internal anaerobic zero-valent iron reactor has stronger shock resistance.

Description

technical field [0001] The invention relates to an electrically enhanced built-in anaerobic zero-valent iron reactor, which belongs to the technical field of water treatment. Background technique [0002] Anaerobic reactor technology and its treatment system have become an attractive water treatment technology due to its advantages of saving investment, reducing energy consumption and operating costs, and good treatment effects. From the second-generation wastewater anaerobic biological treatment reactor (UASB) that came out in the 1970s, it has developed to the third-generation anaerobic reactor that is considered to be the most promising today. Oxygen expanded granular bed reactor (EGSB), internal circulation anaerobic reactor (IC) and anaerobic composite bed (UBF). The key to obtaining high treatment efficiency of the third-generation anaerobic reactor is to form granulated sludge suitable for the wastewater to be treated, so sludge granulation is considered to be a sign...

Claims

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Application Information

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IPC IPC(8): C02F3/28
Inventor 张耀斌刘轶文全燮
Owner DALIAN UNIV OF TECH
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