Anaerobic digestion sludge dewatering method

Abstract

The invention discloses an anaerobic digestion sludge dewatering method. By a struvite crystallization method, sludge is adjusted to be weakly alkaline, then magnesium salt is added so as to form insoluble magnesium ammonium phosphate (commonly known as struvite) crystals. On such basis, an organic flocculant is added, and colloidal particles are destabilized through electrical neutralization, collide with one another and re-aggregate into large particles, so that the floc particle size can be effectively increased, and thus the sludge dewatering performance is enhanced. The biodegradable organic flocculant is used, so that the anaerobic digestion sludge dewatering method is an environment-friendly green sludge dewatering treatment scheme; moisture content of sludge can be reduced to 50% or below, the reduction effect of pressure dewatering equipment can be greatly improved, and subsequent disposal and utilization are facilitated; in addition, based on an idea of turning wastes into treasures and recycling, the nitrogen and phosphorus removal rate is high, and the precipitated product struvite in the sludge is a slow-release fertilizer which can form soil-crop-animal-human-soil phosphorus cycle.

Description

technical field

[0001] The invention relates to the field of sewage sludge treatment, in particular to a method for anaerobically digesting sludge dehydration. Background technique

[0002] With the continuous improvement of my country's urbanization level, the construction of sewage treatment facilities has developed rapidly. In the process of urban sewage treatment, the sewage can be discharged up to the standard after a series of treatments, and a large number of pollutants are enriched, concentrated and transferred to the sludge. Sludge is the most important by-product of sewage biological treatment, and it is also considered to be one of the main sources of secondary pollution of water environment. Sludge from urban sewage treatment plants not only has high water content, is perishable, and has a strong odor, but also contains a large number of pathogenic bacteria, parasite eggs, heavy metals such as chromium and mercury, and toxic, harmful and carcinogenic substances ...

Examples

Embodiment Construction

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0021] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0022] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

technical field

[0001] The invention relates to the field of sewage sludge treatment, in particular to a method for anaerobically digesting sludge dehydration. Background technique

[0002] With the continuous improvement of my country's urbanization level, the construction of sewage treatment facilities has developed rapidly. In the process of urban sewage treatment, the sewage can be discharged up to the standard after a series of treatments, and a large number of pollutants are enriched, concentrated and transferred to the sludge. Sludge is the most important by-product of sewage biological treatment, and it is also considered to be one of the main sources of secondary pollution of water environment. Sludge from urban sewage treatment plants not only has high water content, is perishable, and has a strong odor, but also contains a large number of pathogenic bacteria, parasite eggs, heavy metals such as chromium and mercury, and toxic, harmful and carcinogenic substances ...

Examples

Embodiment Construction

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0021] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0022] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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