Solid carbon source as well as preparation method and application thereof

A solid carbon source and sewage treatment method technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of low nitrogen removal efficiency, slow release speed, carbon source Insufficient and other problems, to achieve the effect of reducing the cost of sewage treatment, high utilization rate, and long-term stable carbon source

Active Publication Date: 2014-08-27
YUNNAN HEXUN ENVIRONMENTAL TECH CO LTD
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Problems solved by technology

[0004] The invention aims at the problem that the carbon-nitrogen ratio of the tail water of the urban sewage treatment plant is low, and its carbon source is insufficient or unstable, which leads to the problem that the denitrification efficiency is not high during further advanced treatment, and provides a solid carbon source with a slow release rate and rich nutrition. And the preparation method of the solid carbon source; also provide a sewage treatment method using the solid carbon source and high denitrification efficiency

Method used

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  • Solid carbon source as well as preparation method and application thereof
  • Solid carbon source as well as preparation method and application thereof
  • Solid carbon source as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1-16

[0026] Embodiment 1-16 solid carbon source and preparation

[0027] (1) Collect cellulose-rich substances, such as rice husks, corn cobs, straw, rice straw, and rice bran, etc., and then crush them to 400 mesh or below to form powders for later use.

[0028] (2) Weighing each powder substance and water for making solid carbon source respectively, the amount of water is 35-45% of the total mass of each powder substance, and then mixing them uniformly to obtain a mixture. The amount of each substance used is shown in Table 1 below.

[0029] (3) Send the mixture into a granulator for granulation (with a particle size of 10-15 mm) and preliminary drying to obtain pellets; the drying temperature is 70-80° C., and the drying time is 50-70 minutes.

[0030] (4) Put the pellets into an oven at 105-110° C. and bake for 1.5-2.5 hours to obtain raw pellets.

[0031] (5) Preheat the raw meal balls in a rotary kiln at 300-500°C for 30 minutes, then gradually increase the temperature of t...

Embodiment 17

[0036]The amount of each substance used to prepare the solid carbon source in this example is the same as that in Example 11, that is, 39 kg of straw powder, 19 kg of rice bran powder, and 7 kg of rice straw powder. The preparation method of the solid carbon source is different from that in Example 11, and the straw powder, rice bran powder and rice straw powder are uniformly mixed. The uniformly mixed solid carbon source can also be packed into a mesh bag for subsequent use in sewage treatment.

[0037] The sieve particle size of different sizes is tested by the sieving method, and the specific surface area is determined by the BET specific surface area detection method. The specific surface area of ​​each carbon source material used to prepare the solid carbon source affects the release rate of the solid carbon source, and the particle size is small. The specific surface area of ​​the carbon source material is greater than that of the carbon source material with a large part...

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Abstract

The invention relates to the technical field of sewage treatment and in particular relates to a solid carbon source as well as a preparation method and application thereof. The solid carbon source is obtained by uniformly mixing at least three substances rich in cellulose, pelletizing and firing. The solid carbon source is placed in an oxygen-poor tank to supply nutrient substances to microorganisms, sewage which is homogenized and averaged sequentially flows through a pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank to be treated, total nitrogen content of discharged water is equal to or less than 10mg / L, and total phosphorus content is equal to or less than 0.5mg / L. The solid carbon source is made of multiple substances rich in cellulose, fibers of various substances can be easily penetrated and wound, after mixing and firing are carried out, a compact cellulose layer structure can be formed, so that release rate of the solid carbon source is greatly reduced, and a carbon source in the sewage can be stable and sufficient for a long time; besides, the solid carbon source is made of multiple substances, abundant nutrient substances can be supplied to the microorganisms, different functions requirements for metabolism can be met, and utilization ratio of the carbon source is increased.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a solid carbon source and its preparation method and application. Background technique [0002] At present, most urban sewage treatment plants adopt the traditional secondary activated sludge treatment process, which plays a positive role in controlling urban water pollution. However, the traditional activated sludge process has a low nitrogen removal rate and cannot fundamentally solve the problem of "eutrophication" of water bodies. Although the three-stage advanced treatment can further purify the water body and achieve a better denitrification effect, the long treatment process, large footprint, and expensive infrastructure operation costs limit its further large-scale application. In order to slow down the trend of further aggravation of eutrophication in water bodies, the total nitrogen concentration of the tail water of urban sewage treatment plants should be mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F9/14
Inventor 裴廷权李文生黄雪森李健驰黄金秀常金增周洪昌周岗泉
Owner YUNNAN HEXUN ENVIRONMENTAL TECH CO LTD
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