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Thermophilic anaerobic digestion treatment method for sludge with high solid holdup

A technology of anaerobic digestion and treatment method, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc. problems, to achieve the effect of good industrial application prospects, high decomposition rate and short fermentation time

Inactive Publication Date: 2016-02-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low solid content of the sludge treated by the existing method, the volume of the sludge to be treated is very large, thereby making the treatment cost very high, increasing the solid content of the sludge to be treated, reducing the volume to be treated, and reducing investment. Cost reduction has become a trend
[0005] However, if the concentration of the treated sludge is increased, that is, the solid content of the sludge is increased, it is difficult to effectively anaerobic digestion with the current method.
At present, there is no report on the treatment of sludge with a solid content greater than 15% by anaerobic fermentation

Method used

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  • Thermophilic anaerobic digestion treatment method for sludge with high solid holdup
  • Thermophilic anaerobic digestion treatment method for sludge with high solid holdup
  • Thermophilic anaerobic digestion treatment method for sludge with high solid holdup

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The anaerobic digestion treatment method of embodiment 1 high solid content sludge

[0037] 1. Raw materials

[0038] Concentrated sludge with a water content of 82.0% (solid content 18.0% w / w) and an organic matter content of 10.6% (by wet weight) comes from Shuangliu County Airport Sewage Treatment Plant in Sichuan Province.

[0039] There is water in the absorption tank.

[0040] 2. Processing method

[0041] (1) Pretreatment: Take the concentrated sludge and heat it at 95°C for 10 minutes;

[0042] (2) Anaerobic digestion:

[0043] Fermentation equipment such as figure 1Shown, comprise reactor (1), gas circulation system, micro-ventilator (8), described gas circulation system comprises absorption tank (2), gas circulation pump (4), flow control meter (7), described reaction The air inlet of the device (1) has an air inlet and two outlets, the inlet and the two outlets are connected by a conversion joint, the outlet a (13) is placed at the bottom of the reactor...

Embodiment 2

[0064] The anaerobic digestion treatment method of embodiment 2 high solid content sludge

[0065] 1. Raw materials

[0066] Concentrated sludge, with a water content of 84.1% (solid content rate of 15.9% w / w) and an organic matter content of 10.8% (by wet weight), comes from the airport sewage treatment plant of Shuangliu County, Sichuan Province.

[0067] 0.01mol / L sodium hydroxide solution in the absorption tank.

[0068] 2. Processing method

[0069] Pretreatment: Take the concentrated sludge and heat it at 120°C for 10 minutes;

[0070] Anaerobic digestion:

[0071] Fermentation device is the same as embodiment 1.

[0072] The processing steps are:

[0073] Reactor start-up is the same as in Example 1.

[0074] Formal operation: (1) Operate in the way of taking and feeding materials every day, the amount of sludge added is 40g / L / d, and the volume of sludge taken out is the same as the volume of added sludge. For example, if the working volume of the reactor is 80% ...

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Abstract

The invention discloses a thermophilic anaerobic digestion treatment method for sludge with high solid holdup. The method for treating the sludge with high solid holdup through a fermentation device comprises steps as follows: (1), pretreatment of to-be-treated sludge; (2), anaerobic digestion: following fermentation devices including a reactor, a gas circulation system and a micro ventilation device are adopted for anaerobic digestion of the to-be-treated sludge treated in the step (1). By means of the method, sludge with high solid holdup up to 15%-20% can be effectively decomposed, the decomposition rate is high, the methane production rate is high, the fermentation time is short, the sludge treatment efficiency is greatly improved, the treatment cost is substantially reduced, and the industrial application prospect is excellent.

Description

technical field [0001] The invention relates to a high-temperature anaerobic digestion treatment method for sludge with high solid content. Background technique [0002] Sludge refers to semi-solid or solid substances produced during sewage treatment. At present, in China, the general technological process of sewage treatment is: anaerobic treatment → denitrification → aerobic treatment. During aerobic treatment, NH 4 + oxidized to NO 3 — , containing NO 3 — The liquid is returned to the denitrification tank, and the NO 3 — Revert to N 2 . Part of the sludge is returned to the anaerobic treatment tank, and the rest is concentrated. In the thickening section, polymer flocculants are added and dewatered with a belt press to obtain concentrated sludge with a water content of about 80%. The concentrated sludge discharge of a sewage treatment plant with a sewage treatment capacity of 100,000 tons / day is 60-80 tons / day (0.06-0.08% of the sewage volume). The annual dis...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F3/30C02F101/30
CPCY02W10/20
Inventor 木田建次谭力程秋石孙照勇汤岳琴
Owner SICHUAN UNIV