Sludge treatment method

A sludge treatment and sludge technology, which is applied in the fields of sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. Dewatering difficulties and other problems, to achieve the effect of improving thermal hydrolysis efficiency, improving sludge hydrolysis efficiency and reducing energy consumption

Inactive Publication Date: 2018-08-21
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects in the prior art that sludge mechanical dehydration is difficult and sludge products are difficult to be recycled, the present invention

Method used

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  • Sludge treatment method

Examples

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Example Embodiment

[0030] Example 1:

[0031] The sludge with a moisture content of 85%-95% is injected into the reactor through a rotor pump. After closing the feed port of the reactor, saturated steam of 0.8Mpa is introduced into the reactor. When the temperature of the slurry reaches 160°C, the steam injection is stopped. Relieve the pressure of the reactor to 0.2~0.4Mpa and keep it for 15~30min to obtain the sludge after thermal hydrolysis;

[0032] The obtained mud that has not been completely cooled after thermal hydrolysis is quickly transported to a diaphragm filter press by a screw pump for mechanical filtration and dehydration. The feed pressure is 0.1Mpa, the pressing pressure is 3Mpa, and the pressing time is 90min to obtain mud cake and filtrate. , Add magnesium chloride to the filtrate, control n(P):n(Mg)=1:1.2~1.6, control the pH=9~11 through the automatic pH adjustment system, and the obtained solid can be used as a slow-release fertilizer in agriculture. As the carbon source for nit...

Example Embodiment

[0036] Example 2:

[0037] Inject the sludge with a moisture content of 85%-95% into the reactor through a rotor pump, close the feed port of the reactor, and introduce saturated steam of 1.5Mpa into the reactor. When the temperature of the slurry reaches 175℃, stop the steam injection ,Relieve the pressure of the reactor to 0.2~0.4Mpa and keep it for 15~30min to obtain the sludge after thermal hydrolysis;

[0038] The obtained mud that has not been completely cooled after thermal hydrolysis is quickly transported to a diaphragm filter press by a screw pump for mechanical filtration and dehydration. The feed pressure is 0.1Mpa, the pressing pressure is 3Mpa, and the pressing time is 90min to obtain mud cake and filtrate. , Add magnesium sulfate to the filtrate, control n(P):n(Mg)=1:1.2~1.6, and control the pH=9~11 through the automatic pH adjustment system. The solid obtained is used as a slow-release fertilizer in agriculture. As the carbon source for nitrogen and phosphorus remo...

Example Embodiment

[0042] Example 3:

[0043] The sludge with a moisture content of 85%-95% is injected into the reactor through a rotor pump. After closing the reactor feed port, 2Mpa saturated steam is introduced into the reactor. After the temperature of the slurry reaches 190℃, the steam injection is stopped. Relieve the pressure of the reactor to 0.2~0.4Mpa and keep it for 15~30min to obtain thermally hydrolyzed sludge;

[0044] The obtained mud that has not been completely cooled after thermal hydrolysis is quickly transported to a diaphragm filter press by a screw pump for mechanical filtration and dehydration. The feed pressure is 0.1Mpa, the pressing pressure is 3Mpa, and the pressing time is 90min to obtain mud cake and filtrate. , Add magnesium sulfate to the filtrate, control n(P):n(Mg)=1:1.2~1.6, and control the pH=9~11 through the automatic pH adjustment system. The solid obtained is used as a slow-release fertilizer in agriculture. As the carbon source for nitrogen and phosphorus remo...

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Abstract

The invention discloses a sludge treatment method. The method comprises steps as follows: sludge is injected into a reaction kettle, saturated steam is introduced into the reaction kettle, so that thesludge is subjected to a thermal hydrolysis reaction, and mud subjected to thermal hydrolysis is obtained; the obtained mud is injected into a filter press for mechanical filter-pressing dewatering,and a mud cake and filtrate are obtained; the obtained mud cake is put in a carbonization furnace to be carbonized, and biochar, pyrolysis gas and tar are obtained; a part of the obtained biochar is taken as a catalyst for the thermal hydrolysis reaction and back-mixed in the reaction kettle; the obtained pyrolysis gas and tar are subjected to dust removal and introduced into a pyrolysis gas steamboiler, and produced high-temperature steam is returned to the reaction kettle. By means of the method, the bio-char is taken as a raw material for the catalytic thermal hydrolysis reaction, the sludge hydrolysis efficiency can be improved, no chemical addition in the high-dryness dewatering process of sludge can be realized, and a new thought for sludge treatment is further expanded.

Description

technical field [0001] The invention relates to the field of sludge disposal, in particular to a sludge recycling technology. Background technique [0002] Municipal sludge contains high moisture content and rich organic matter, and at the same time, sludge contains a certain amount of heavy metals, pathogenic bacteria, parasite eggs, etc. If it is not disposed of properly, it will inevitably cause secondary pollution and seriously affect the surrounding ecological environment. Municipal sludge is composed of a large number of cellular organic matter. These cells are protected by cells composed of cellulose and peptidoglycan. The water and organic matter in the cells are not easy to be separated and hydrolyzed, making it difficult to dehydrate the sludge. [0003] At present, some sludge treatment methods and devices have been developed in the market in order to reduce the moisture content and harmful components of sludge, and at the same time realize the resource utilizatio...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/12C10B53/00
CPCC02F11/10C02F11/122C02F2103/001C10B53/00Y02W10/40
Inventor 刘军张二杨常邦华戴昕袁建海
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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