Processing method capable of recycling iron-containing sludge generated in advanced oxidation techniques

A sludge recycling and treatment method technology, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of occupying large land resources, refractory iron-containing sludge, waste of iron resources, etc. problems, to achieve the effect of saving drug costs, reducing costs, and reducing usage

Inactive Publication Date: 2013-11-13
山东申龙水务有限公司
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AI Technical Summary

Problems solved by technology

[0004] In the process of advanced oxidation (Fenton-like process) treatment of sewage, a certain amount of refractory iron-containing sludge will be produced. The traditional treatment method is landfill after dehydration, which will occupy a large amount of land resources, and is also a waste of time. waste of iron resources

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  • Processing method capable of recycling iron-containing sludge generated in advanced oxidation techniques

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Effect test

Embodiment 1

[0016] Example 1: In a pulp and paper enterprise using wood as raw material, the water in the middle section passes through a biochemical system (various forms of anaerobic and aerobic processes) and the COD of the effluent is ≤ 250mg / L.

[0017] (1) The waste water enters the buffer pool by gravity, adding 1000ppm ferrous sulfate, after being mixed evenly by the impeller of the lifting pump, it enters the catalytic oxidation reactor, and at the same time, adds 100ppm hydrogen peroxide, reacts for 6 minutes, flows into the oxidation flocculation tank for 30 minutes, and adjusts the pH value by adding alkali To 7.0, add flocculant to precipitate for 5 hours, the COD of the effluent is 70mg / L, and the COD removal rate is 72%.

[0018] (2) Put the iron-containing sludge in the sludge thickening tank into the sludge dissolving tank, add a certain amount of waste hydrochloric acid, and turn on the mixer to fully dissolve the sludge to form a ferric iron solution. At this time, the p...

Embodiment 2

[0021] Example 2: Man-made fiber enterprises that use α-cellulose extracted from cellulose raw materials such as wood and plant stalks, or cotton linters as raw materials, processed into spinning stock solution, and then wet-spun , The wastewater passes through the biochemical system (various forms of anaerobic and aerobic processes) and the effluent COD≤400mg / L.

[0022] (1) The waste water flows into the buffer pool by itself, and 1500ppm ferrous sulfate is added. After being mixed evenly by the impeller of the lifting pump, it enters the catalytic oxidation reactor, and at the same time, 180ppm hydrogen peroxide is added, reacted for 8 minutes, flows into the oxidation flocculation tank for 40 minutes, and adjusts the pH value To 7.0, add flocculant to precipitate for 5 hours, the COD of the effluent is 100mg / L, and the COD removal rate is 75%.

[0023] (2) Put the iron-containing sludge in the sludge thickening tank into the sludge dissolving tank, add a certain amount of ...

Embodiment 3

[0026] Example 3: In a printing and dyeing factory mainly processing cotton, hemp, chemical fiber and their blended products, the wastewater passes through biochemical systems (various forms of anaerobic and aerobic processes) and the effluent COD≤180mg / L.

[0027] (1) The waste water flows into the buffer pool by itself, and 1200ppm ferrous sulfate is added. After being mixed evenly by the impeller of the lifting pump, it enters the catalytic oxidation reactor, and 130ppm hydrogen peroxide is added at the same time, and reacts for 7 minutes. To 7.0, add flocculant to precipitate for 5 hours, the effluent COD is 60mg / L, and the COD removal rate is 67%.

[0028] (2) Put the iron-containing sludge in the sludge thickening tank into the sludge dissolving tank, add a certain amount of waste hydrochloric acid, and turn on the mixer to fully dissolve the sludge to form a ferric iron solution. At this time, the pH value is 1.3 ;

[0029] (3) Put the ferric iron solution into the sto...

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Abstract

A processing method capable of recycling iron-containing sludge generated in advanced oxidation techniques comprises the following steps: a. putting iron-containing sludge, which is in a sedimentation tank, into a sludge concentrating tank for gravity concentration, so that the volume and water content of the sludge are largely reduced; b. moving the concentrated sludge into a sludge dissolving tank, adding acid into the sludge dissolving tank, adjusting the pH to not greater than 1.5, and stirring at the same time to fully dissolve the sludge; c. moving the sludge-dissolved solution, the main component of which is ferric iron, into a storage tank for storage, leaving a portion of the solution as a flocculant which can substitute aluminum salts, and moving the rest of the solution into a reduction reaction tank; and d. adding single substance of Fe into the reduction reaction tank, so that the ferric iron undergoes reduction reactions to generate ferrous iron and the ferrous iron is moved into a buffer pool to decrease ferrous iron usage. The method has the following advantages: the method reduces the cost of sludge disposal; the flocculant can substitute PAC, so that medicament cost is lowered; and the recovered ferrous ion catalyst reenter reaction processes, so that catalyst usage can be reduced.

Description

[0001] technical field [0002] [0003] The invention relates to a method for recycling sewage and sludge, and belongs to the field of environmental protection, in particular to a method for recycling iron-containing sludge produced by an advanced oxidation process. Background technique [0004] In the process of advanced oxidation (Fenton-like process) treatment of sewage, a certain amount of refractory iron-containing sludge will be produced. The traditional treatment method is landfill after dehydration, which will occupy a large amount of land resources and is also a waste of time. Waste of iron resources. With the widespread use of the current advanced oxidation process, a large amount of such sludge will be produced. How to properly and scientifically treat this type of sludge is a topic of common concern all over the world, and how to realize recycling of iron sludge. Contents of the invention [0005] The object of the present invention is to provide a kind of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 李成江
Owner 山东申龙水务有限公司
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