A method of external heating assisted sludge biological drying

A technology of biological drying and external heating, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problems of high energy consumption in equipment operation, difficulty in large-scale promotion and application, high investment and operating costs, etc. Achieve the effect of saving processing cost, saving fermentation time, and rapid biological drying

Active Publication Date: 2022-05-20
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

Although thermal drying has the advantages of small footprint, obvious weight reduction, and flexible product uses, there are still many problems in the thermal drying process, mainly because of high investment and operating costs, high energy consumption for equipment operation, and difficulty in large-scale promotion and application.

Method used

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  • A method of external heating assisted sludge biological drying

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Embodiment 1

[0032] The present invention provides a method of external heating assisted sludge bio-drying, comprising the following steps;

[0033] S1, the sludge to be dried and the auxiliary materials are stirred and mixed in proportion to the high temperature thermophilic fermentation microorganisms are added to form a mixed material, because the moisture content of the mixed material is maintained at 50% to 56% after the auxiliary material is added, the height of the mixed material is 1 to 2m, and the fermentation microorganism in the sludge to be dried makes the mixed material ferment to form a fermentation heap;

[0034]Among them, the initial moisture content of the sludge to be dried in step S1 is 80% to 90%. The excipients are straw powder, rice husks, peanut husks, wheat bran or wood chips, and the quality of the excipients is 50% to 70% of the quality of the sludge to be dried. Since the initial moisture content of the sludge to be dried is relatively high, the auxiliary materials ...

Embodiment 2

[0045]S1, the moisture content of 88.7% to be dried sludge and straw powder according to the weight ratio of 2:1 evenly stirred and mixed, add high temperature thermophilic fermentation microorganisms to form a mixed material, adjust the moisture content of the mixed material so that the moisture content of the mixed material is maintained at 50%; of which, the height of the mixed material is 1m; the fermentation microorganism in the sludge to be dried makes the mixed material ferment to form a fermentation heap;

[0046] S2, aerobic aeration of the primary fermentation reactor, ventilation amount of 3m per cubic meter of reactor 3 / h, at the same time, the use of additional electric auxiliary heat to the primary fermentation reactor for the first thermal auxiliary heating, the ambient temperature of 24 ° C, the heating amount of 6750kJ / h per cubic meter of the reactor, electric auxiliary heating 20min, stop 40min, when the temperature of the primary fermentation reactor reaches...

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Abstract

The invention belongs to the technical field of sludge treatment, and in particular relates to a method for assisting biological drying of sludge by external heating. In this method, the sludge to be dried and auxiliary materials are stirred and mixed in proportion, and then high-temperature thermophilic fermentation microorganisms are added to form a mixture material, and the fermentation microorganisms in the sludge to be dried ferment the mixture material to form a primary fermentation pile; Aerobic aeration is carried out on the body, and at the same time, the temperature of the primary fermentation pile is assisted by intermittent heating through an external heat source; the heat generated by the aerobic fermentation of high-temperature thermophilic fermentation microorganisms makes the second fermentation pile body reheated for 12 to 18 hours; When the temperature of the fermentation pile drops below 50°C, the fermenting microorganisms ferment and continuously heat the three fermentation piles through an external heating source at the same time. When the temperature rises to 65-70°C, the external heating is stopped, and the moisture content is reduced by repeated repetitions. to below 35%. Therefore, the method greatly saves sludge drying time and treatment cost, has low energy consumption, shortens the drying cycle, and realizes rapid biological drying of sludge.

Description

Technical field [0001] The present invention belongs to the field of sludge treatment technology, in particular to a method of external heating auxiliary sludge bio-drying. Background [0002] Municipal sludge is a by-product of urban sewage treatment plants in the process of treating urban domestic sewage, which mainly includes primary sedimentation sludge and residual sludge. Municipal sludge has a high moisture content, easy to form artificial wetlands to affect the local ecological environment, and the municipal sludge has a high content of organic matter, rich in nutrients, is very prone to corruption, releases a large amount of odor and thus pollutes the atmospheric environment; rich in microorganisms, including some parasites and pathogenic bacteria, threatening human health, it is very easy to pollute water resources and soil, endangering the growth of animals and plants, and finally entering the human body through enrichment. Therefore, if the municipal sludge is not pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/02
CPCC02F11/02C02F11/008C02F2301/08Y02W10/37
Inventor 刘铮王有昭朱彤马峰张庆军常铭东
Owner NORTHEASTERN UNIV LIAONING
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