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Method and system for methane fermentation processing of sludge using hydrothermal reactions

A methane fermentation and hydrothermal reaction technology, applied in water/sludge/sewage treatment, biological sludge treatment, water treatment parameter control, etc., can solve problems such as not reaching economic balance

Inactive Publication Date: 2014-11-12
KAJIMA CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these pre-treatments have not yet reached an economic balance from the perspective of energy consumption.

Method used

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  • Method and system for methane fermentation processing of sludge using hydrothermal reactions
  • Method and system for methane fermentation processing of sludge using hydrothermal reactions
  • Method and system for methane fermentation processing of sludge using hydrothermal reactions

Examples

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Embodiment 1

[0055] figure 1 and figure 2 The embodiment is provided with the cleaning device 40 that carries out water displacement cleaning or chemical cleaning to the interior of the circulation path 14a, 14b of the hydrothermal reaction device 10, and can drive cleaning according to the detection of the scale fixation status by means of the above-mentioned fixation status detection device 30 device 40. As mentioned above, in the circulation type hydrothermal reaction device 10, it is necessary to periodically clean the scale fixed in the circulation path, but by driving the cleaning device 40 according to the detection of the scale fixation state by the detection device 30, it is not necessary to stop and open The need for cleaning of the reaction device 10 can be judged, and the reaction device 10 can be cleaned at an optimal timing.

[0056] The cleaning device 40 of the illustrated example has an injection path connected to the feed path 9 of the hydrothermal reaction device 10 ...

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Abstract

Provided are a method and system which use circulation-type hydrothermal reactions to process sludge by methane fermentation in an energy-efficient manner and stably over a long period of time. In this methane fermentation processing method, after the moisture content of the sludge (S) is adjusted to a prescribed level, the sludge (Sa) with the adjusted moisture content level is pumped into a circulation path (14a, 14b) connecting a hydrothermal reactor (11) and a gas-liquid separator (12) and is reduced in molecular weight by circulation for a prescribed period of time at a prescribed temperature and pressure, and the low molecular weight sludge (Sc) outputted from the circulation path (14a, 14b) is retained in a fermentation tank (20). The scale deposit state in the circulation path (14a, 14b) is continuously detected and the prescribed moisture ratio of the sludge (Sa) pumped into the circulation path (14a, 14b) is adjusted in response to the variation of the scale deposit state. Ideally, a flowmeter (31) and a flow rate control valve (32) are provided to control the circulation flow rate of the sludge (Sa) in the circulation path (14a, 14b) to the prescribed flow rate, the scale deposit state is detected from the opening degree of the flow rate control valve (32), or the scale deposit state is detected from the surface temperature of the circulation path (14a, 14b).

Description

technical field [0001] The present invention relates to a sludge methane fermentation treatment method and system using hydrothermal reaction, and in particular to a method and system for methane fermentation treatment of sludge discharged from a sewage treatment field or a wastewater treatment field, etc. . Background technique [0002] In wastewater treatment plants such as sewage treatment plants, chemical plants, food factories, etc., the activated sludge method in which organic matter in sewage and wastewater is decomposed by microorganisms is widely used, and solid components such as undecomposed organic matter or multiplied microorganisms are produced. A large amount of raw sludge and excess sludge (hereinafter referred to as sludge for short). Sludge needs to be disposed of as industrial waste. In the past, most sludge was dehydrated or incinerated and then landfilled. However, recently, from the viewpoint of preventing global warming, volume reduction and weight re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/08
CPCY02E50/343C02F2103/32C02F2209/001C02F2209/055C02F11/04Y02E50/30
Inventor 多田罗昌浩菊池茂筱原信之
Owner KAJIMA CORP
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