Magnetite-enhanced biological electrode coupled UASB (upflow anaerobic sludge bed/blanket) apparatus and operation method

A bio-electrode, magnetite technology, applied in biological treatment devices, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problem of insignificant power-on effect, low biomass on the electrode surface, anodic oxidation efficiency, and electron transfer efficiency. It can improve the pollutant removal performance, promote the sludge granulation process, and strengthen the anaerobic sludge granulation process.

Inactive Publication Date: 2016-07-06
ZHEJIANG UNIV
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Problems solved by technology

However, the bioelectrochemical process has problems such as low biomass on the electrode surface, limited anodic oxidation efficiency, and low electron transfer efficiency between microorganisms and the electrode surface, which makes the effect of powering on the reactor in the initial start-up stage not obvious.

Method used

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  • Magnetite-enhanced biological electrode coupled UASB (upflow anaerobic sludge bed/blanket) apparatus and operation method

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preparation example Construction

[0024] The preparation method of described magnetite nanoparticles is as follows: configure 0.3molL with deoxygenated ultrapure water -1 H 2 SO 4 Solution 200mL, add Fe 2 (SO 4 ) 3 ·xH 2 O (6.4g) and FeSO 4 ·7H 2 O (4.45g) was stirred to dissolve. Add the mixed solution drop by drop to 250mL, 1.5mmolL -1 In the sodium hydroxide solution, stir vigorously at the same time to make it fully react, and a black precipitate of magnetite will be produced immediately at this time. Place a magnet near it to speed up the separation of the suspension, then discard the supernatant. The black precipitate was washed with deoxygenated ultrapure water and centrifuged at 4000 rpm, and this operation was repeated three times. Finally, the black precipitate was added to 0.25L deoxygenated ultrapure water to form a magnetite colloidal solution.

[0025] A kind of operation method of described device magnetite strengthening biological electrode coupling type UASB device, comprises the fo...

Embodiment

[0030]Use the above device to start the anaerobic reactor, and run three sets of anaerobic reactors, R1 is a magnetite-bioelectrode coupled UASB reactor, R2 is a bioelectrode coupled UASB reactor, R3 is a conventional UASB reactor, The R1 and R2 reactors were applied with 1.5V voltage, except that other reaction conditions were the same. The inner diameter of the upper part of the UASB reactor is 19cm, the inner diameter of the lower part is 11cm, the height is 50cm, the total volume is 6.6L, and the effective volume is 6.38L.

[0031] The start-up phase of the R1 reactor is as follows:

[0032] 1) Take the anaerobic activated sludge that has been domesticated and cultivated, add 1L nano-magnetite colloidal solution to it, and mix well. Inoculation sludge concentration MLSS is 44.57gL -1 , MLVSS is 16.61gL -1 ; After the reactor was started, the Fe concentration was finally 3.37gL -1 , equivalent to 0.5gFeg -1 MLVSS.

[0033] 2) Inoculate the mixed sludge obtained in ste...

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Abstract

The invention discloses a magnetite-enhanced biological electrode coupled UASB (upflow anaerobic sludge bed/blanket) apparatus and an operation method.The apparatus comprises an upflow anaerobic biological reactor barrel and a biological electrode system, wherein a circular electrode is disposed in a upflow anaerobic biological reactor sludge layer, a graphite fiber brush anode is disposed in the center, and a graphite felt cathode is arranged around; a biological electrode is connected with a direct-current power supply outside a reactor body through a conductive copper wire; circuit current is monitored in real time through a universal meter connected outside the reactor bod.Direct electron transmission between microbes and the electrode is enhanced by adding the magnetite nanoparticles, and finally an anaerobic biological reactor is quickly started, sludge is granulated and productivity is improved.

Description

technical field [0001] The invention relates to the field of sewage treatment, and relates to a magnetite-enhanced biological electrode coupling type UASB device and an operating method. Background technique [0002] Anaerobic biological treatment process is currently one of the effective technical means to treat toxic and refractory organic wastewater. This process has low energy consumption, high volume load, low sludge production, and can generate biogas while removing COD. One of the most widely used techniques. Anaerobic biological treatment processes include upflow anaerobic sludge bed reactor (UASB), anaerobic biological filter, anaerobic contact process, sludge expanded bed, anaerobic fluidized bed and anaerobic biological turntable, etc. However, due to the growth characteristics of anaerobic microbial flora, the anaerobic bioreactor is prone to organic acid accumulation and the start-up period is long, which affects the application of anaerobic technology in sewag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/2846C02F1/46109C02F1/488C02F2203/006
Inventor 朱亮靳捷汪彩琴高心怡徐向阳
Owner ZHEJIANG UNIV
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