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Anaerobic zero-valent iron sewage treatment method

A sewage treatment method and zero-valent iron technology, applied in water/sewage treatment, anaerobic digestion treatment, reduced water/sewage treatment, etc., can solve problems such as affecting the efficiency of sewage treatment, blocking the passage of water, and short-circuiting local channels. To achieve the effect of increasing the fluidization effect, increasing the water load and slowing down the rate of rust formation

Active Publication Date: 2010-01-13
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] However, the biggest problem of zero-valent iron in practical application is the hardening of the iron filings bed: the rust formed by the iron filings contacting the air causes adhesion between the iron filings, blocks the flow of water, causes local channeling or short circuit, and seriously affects the efficiency of sewage treatment
However, so far, no patents or reports have been found that put zero-valent iron (internal electrolysis) in the anaerobic reactor to realize the coupling of two unit processes and apply it to the treatment of refractory sewage

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Embodiment Construction

[0036] figure 1 A working principle diagram of an anaerobic reactor is shown. The anaerobic reactor mainly includes a cylindrical reactor shell 1, in which a water distributor 6, three zero-valent iron filling layers 4, and a biological filter layer are sequentially arranged in the reactor shell 1 from bottom to top. 3 and a three-phase separator 2, which divide the inner cavity of the reactor shell 1 into a gas-liquid solid separation zone 1a located above the biological filter material layer 3, and a gas-liquid solid separation zone 1a located between the biological filter material layer 3 and the zero-valent iron filling layer 4 There is a suspended sludge zone 1c between them and a sludge bulking zone 1d between the zero-valent iron filling layer 4 and the water distributor 6 . The reactor shell 1 is made of plexiglass or FRP, with an inner diameter of 90cm, a height of 120cm, and an effective volume of 6.36L. The height of the biological filter material layer 3 and the ...

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Abstract

The invention relates to an anaerobic zero-valent iron sewage treatment method, belonging to the sewage treatment technical field. The anaerobic zero-valent iron sewage treatment places zero-valent iron in an anaerobic reactor and utilizes the environmental conditions of the anaerobic isolated air to largely reduce the formation rate of the rust of zero-valent iron and avoid the formation of hardening; meanwhile, the method uses the reducing action of metal iron to increase the anaerobic reductive atmosphere, balance the pH and increase the effect of the anaerobic organism. A circulating pump is adopted for sewage backflow so as to increase the overflow load of an iron / activated carbon layer and the reaction effect of zero-valent iron, improve the fluidization effect of sludge to increase the anaerobic process efficiency. In a sewage treatment system, ferrous iron contained in the discharged sewage is oxidized to Fe(OH)3 with the air and the coagulation generated in the process can further purify the sewage. Long-term experiment research shows that the decolorizing rate of the sewage treatment method for dye wastewater can teach 85%-95%, the COD can be reduced by more than 50% and the biodegradability can be increased to more than 0.3.

Description

technical field [0001] The invention relates to a sewage treatment method for anaerobic zero-valent iron, belonging to the technical field of waste water treatment. Background technique [0002] At present, the treatment methods of industrial wastewater mainly include conventional physical and chemical methods and biochemical methods. Physicochemical methods mainly include coagulation-sedimentation, adsorption, Fenton, photoelectric catalysis, etc.; biochemical methods mainly include aerobic, anaerobic, and hydrolytic acidification-aerobic methods. Coagulation sedimentation is not effective for printing and dyeing wastewater with strong solubility; adsorption method is suitable for the treatment of weakly polar organic substances, and is generally used at the end of the treatment process. Fenton uses the strong oxidizing OH free radicals to decolorize the dye molecules, but strong acidic conditions are required, and the residual H 2 o 2 It has a great impact on the subseq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/70C02F1/461C02F3/28C02F1/52
CPCY02E50/30
Inventor 全燮张耀斌荆彦文
Owner DALIAN UNIV OF TECH
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