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Method for accelerating sludge anaerobic digest speed rate of sewage plant

An anaerobic digestion and sewage plant technology, applied in sludge treatment, biological sludge treatment, etc., can solve the problems of long residence time of sludge anaerobic digestion, troublesome sludge disposal, slow hydrolysis step rate, etc., and achieve reduction Toxicity of small pollutants, good economic benefits and environmental benefits, effects of good economic benefits

Inactive Publication Date: 2005-11-23
NANJING UNIV
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Problems solved by technology

[0004] Anaerobic digestion is divided into four steps: hydrolysis, acidification, acid production, and methane production. Among them, the rate of hydrolysis step is slow, which leads to the disadvantages of long residence time (generally 30-40 days) and low digestibility of sludge anaerobic digestion. , which will inevitably make the sludge digestion unit very large
Expensive fixed investment and large floor area make it impossible for many sewage plants to build sludge digestion plants, which brings great trouble to the subsequent disposal of sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The test sludge is excess sludge from a municipal sewage plant, with a water content of about 98% and an average particle size of 85 μm. After the sludge is mixed, pass through a 50mm sieve to remove impurities with large particle size (such as plastic bags, branches, rotten leaves, bricks, etc.) in the sludge. through 60 Co source (source intensity is 500,000Ci), the sludge is irradiated at a lower irradiation dose (2.48kGy), the soluble chemical oxygen demand increases by 79% after irradiation, and the average particle size decreases to 59.22μm. The irradiated sludge and inoculated sludge enter the mesophilic anaerobic static digestion reactor at a ratio of 1:1, and the volume of the reactor is 500ml. The temperature and stirring intensity of the anaerobic reaction are controlled by a constant temperature water bath oscillator, the reaction temperature is 35±1°C, and the stirring speed is 80±10 rpm. The anaerobic reaction cycle is 20 days, during which in...

Embodiment 2

[0026] Embodiment 2: Change the irradiation intensity in Embodiment 1 to 6.51 kGy, and keep other operating conditions unchanged. The soluble COD increased by 277%, and the average particle size decreased to 60.64μm. After the reaction, compared with the control experiment (0kGy), the gas production increase rates on the 2nd, 5th, 10th, 14th, and 20th day were 21%, 18%, 23%, 19%, and 20%, respectively.

Embodiment 3

[0027] Embodiment 3: Change the irradiation intensity in Embodiment 1 to 11.24kGy, and keep other operating conditions unchanged. The soluble COD increased by 423%, and the average particle size decreased to 55.61 μm. After the reaction, compared with the control experiment (0kGy), the gas production rate of the 2nd, 3rd, 5th, 10th, 14th, 16th, and 20th days were respectively 33%, 40%, 38%, 41%, 35%, 34%, 36%.

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Abstract

The present invention discloses a method for accelerating the anaerobic digestion rate of sewage plant sludge. Aiming at the current difficulty that the anaerobic digestion cycle of sludge is relatively long, it provides a method for accelerating the anaerobic digestion rate of sewage plant sludge. The method reacts The cycle is short, the cost is low, and the gas production can be increased at the same time, which has good economic benefits. The specific steps of the method for accelerating the anaerobic digestion rate of sewage plant sludge are: sieve the remaining sludge from the sewage plant with a sieve with a mesh size of 5-50 mm to remove impurities with larger particles; Irradiate it with high-penetrating γ-rays to control the radiation dose absorbed by the sludge at 2.48-30kGy; the irradiated sludge and the inoculated sludge are inoculated at a ratio of 1-5:1. For anaerobic digestion reaction, the stirring speed is controlled at 70-120 rpm, the reaction temperature is 20-60°C, and the reaction time is 10-20 days. This technology can be used in sludge treatment systems in sewage plants.

Description

technical field [0001] The invention relates to a technique for accelerating the anaerobic digestion rate of sewage plant sludge, which can be widely applied to the sludge treatment system of sewage plant. Background technique [0002] Sewage plant sludge refers to the flocculent substances produced in the water treatment process, mainly composed of organisms, organic matter and a large amount of water. Sludge contains a large amount of organic matter, N, P and other elements, and also contains harmful substances such as heavy metals, refractory organic matter and pathogenic bacteria. If it is allowed to be discharged, it will cause serious environmental pollution. At present, the commonly used methods in many countries including my country mainly include agricultural application, landfill, incineration and so on. [0003] Generally speaking, the sludge output is 1 to 3% of the treated sewage volume. At present, the annual sludge discharge in my country is about 5.0×10 6 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCY02W10/20
Inventor 袁守军郑正牟艳艳于鑫倪利晓严晓明郭照冰李时银胡文勇杨光俊张继彪顾春晖吴文继
Owner NANJING UNIV
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