Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity

A ferrate, oxidation treatment technology, applied in water/sludge/sewage treatment, oxidation treatment of sludge, biological water/sewage treatment, etc. Sewage treatment efficiency and other issues, to avoid sludge bulking problems, simple equipment, and low prices

Inactive Publication Date: 2012-07-18
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research report describes a ferrate oxidation sludge method, and the final treatment result is that the sludge is oxidized and hydrolyzed, but does not involve related sewage and sludge treatment processes, as well as sludge yield, sewage treatment efficiency, sludge Dehydration etc.

Method used

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  • Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity
  • Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity
  • Novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Example 1: The sewage biological treatment system used in this test is a laboratory-scale fully mixed traditional activated sludge process, which does not have the function of biological nitrogen and phosphorus removal. The effective volume of the aeration tank is 12.5L, and the effective volume of the sedimentation tank is 2.2L. There are 2 sets of test devices, input domestic sewage of the same water quality (COD is 600mg / L, BOD is 600mg / L, BOD 5 is 260mg / L, the total nitrogen concentration is 80mg / L, the ammonia nitrogen concentration is 40mg / L), and the hydraulic retention time is 6 hours. The aeration tank is continuously aerated, the mud-water mixture in the aeration tank enters the sedimentation tank, and all the sludge in the sedimentation tank flows back into the aeration tank, so that the sludge concentration (MLSS) in the aeration tank gradually increases. When the sludge concentration in the aeration tank (mixed liquid suspended solids MLSS) exceeds 4000mg / ...

Embodiment 2

[0024] Embodiment 2: Different from Embodiment 1, the sewage biological treatment system adopts A 2 The / O activated sludge process has the function of biological nitrogen and phosphorus removal. The effective volume of the anaerobic tank and the anoxic tank is 2.5L, the effective volume of the aerobic tank is 7.5L, and the effective volume of the sedimentation tank is 3L. There are 2 sets of test devices in total. Domestic sewage of the same water quality (COD is 600mg / L, BOD is 600mg / L, BOD 5260mg / L, the total nitrogen concentration is 80mg / L, the ammonia nitrogen concentration is 40mg / L), the hydraulic retention time is 2 hours, and the sludge concentration is 2500mg / L. The effluent from the anaerobic tank enters the anoxic tank, the hydraulic retention time is 2 hours, and the sludge concentration is 2500mg / L. The effluent from the anoxic tank enters the aerobic tank, the hydraulic retention time is 6 hours, the sludge concentration is 3500mg / L, the aerobic tank is conti...

Embodiment 3

[0027] Example 3: An urban sewage treatment plant that processes 200,000 tons of domestic sewage a day produces 35 tons of sludge with a moisture content of 78% every day. With the novel sewage treatment process of the present invention, about one-third of the return sludge per day oxidizes with potassium ferrate (the mass ratio of potassium ferrate to sludge is 0.2), and the reacted sludge enters the biological treatment system. The amount of residual sludge can be reduced by 40% compared with the original activated sludge process, and the annual waste sludge production can be reduced by 5,000 tons. The construction cost of adding sludge storage tanks and corresponding pipelines and pumps (about 300,000 yuan) is deducted from the construction cost, and the cost of adding potassium ferrate and the electricity cost of the pump (about 150,000-200,000 yuan / years). If the sludge is treated with anaerobic digestion, the investment cost can be reduced by nearly 8 million yuan, and ...

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Abstract

A novel sewage treatment process utilizing ferrate oxidization to reduce sludge quantity comprises the steps that a emical treatment unit effectively removes and converts organic pollutants into inorganic small molecular substance through microorganism in a biochemical treatment system, and the certain sludge concentration in the biochemical treatment unit is maintained; in a sediment unit, sewage produced after the treatment of the biochemical treatment unit enters a secondary sedimentation tank to perform sludge-water separation, a part of subsided sludge is excess sludge, the rest is returned sludge, and two third of returned sludge directly enters the biochemical treatment unit; in a ferrate oxidization treatment unit, one third of returned sludge enters a sludge reaction tank to react with input ferrate for 10-30 minutes, wherein the mass ratio of the ferrate to the excess sludge is 0.2:1; and a sludge dewatering unit performs filter pressing or centrifugal dewatering of the excess sludge. The novel sewage treatment process can reduce 35-45% of excess sludge quantity, has the advantages of being simple in devices, few in investment, free of pollution, convenient to operate and manage, low in operation cost and the like, and is suitable for application of industrial municipal sewage treatment plants.

Description

technical field [0001] The invention relates to a sewage treatment process for reducing sludge by utilizing ferrate oxidation. The process can effectively reduce the output of excess sludge while purifying sewage, and reduce the subsequent treatment and disposal costs of excess sludge, and can be used in industrial and urban domestic sewage treatment plants (stations). Background technique [0002] The biological sewage treatment method based on activated sludge is currently the most widely used sewage biological treatment technology in the world, but it has always had one of the biggest drawbacks, that is, it will produce a large amount of excess sludge. With the increasing amount of sewage and the continuous improvement of sewage treatment rate, my country's sludge production will increase significantly in the next few years. Although the sludge volume only accounts for 1-2% of the sewage volume, the investment in sludge treatment facilities accounts for about 40-50% of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F3/12
CPCY02W10/10
Inventor 叶芬霞刘新文李颖
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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