Method for treating excess sludge and composting products and applications

A technology for excess sludge and composting, which is applied in the direction of sewage/sludge fertilizer, application, sludge treatment, etc. It can solve the problems of unsatisfactory compost stabilization effect, long-term and efficient composting of earthworms, and limited function of earthworms, etc.

Active Publication Date: 2020-10-27
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] None of the above methods is an ideal biological treatment technology for surplus sludge. However, compared with anaerobic digestion, aerobic digestion and aerobic composting, the above-mentioned shortcomings in the process of earthworm composting lead to limited function of earthworms and unsatisfactory compost stabilization effect. As a result, vermicomposting cannot be carried out efficiently for a long time

Method used

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  • Method for treating excess sludge and composting products and applications
  • Method for treating excess sludge and composting products and applications
  • Method for treating excess sludge and composting products and applications

Examples

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Effect test

Embodiment 1

[0085] Embodiment 1: a kind of method for processing excess sludge

[0086] The method for processing surplus sludge in the present embodiment, it may further comprise the steps:

[0087] (1) After adjusting the concentration of the excess sludge in the regulating tank, the concentration of the excess sludge is 395mg / L, and the hydraulic load is 4.0m 3 / (m 2 ·d), the organic load is 1.19kg·VSS / (m 3 d), pumped into the earthworm biofilter, after treatment, drip filter into the sedimentation tank, the supernatant in the sedimentation tank is returned to the adjustment tank, the sediment is concentrated, filtered and left to stand, and the vermicompost sludge is obtained. 90%, organic matter content (TOC) is 268g / kg, pH value is 6.83, electrical conductivity (EC) is 2150us / cm, C / N is 7.5;

[0088] (2), after mixing vermicompost sludge and conditioner cow dung in a composting device for 14 days, wherein the moisture content of cow dung is 21%, the organic matter content (TOC) i...

Embodiment 2

[0093] Embodiment 2: composting device

[0094]The composting device in this embodiment includes: a cover and an open container arranged in sequence from top to bottom, and the cover and the open container are detachably connected. Among them, the open-top container is a circular platform-shaped container made of polyethylene plastic, with a diameter of 20 cm at the top, a diameter of 15 cm at the bottom, and a height of 15 cm; 6 through holes are evenly distributed on the cover, and 4 holes are evenly distributed on the bottom of the open-top container. through holes, the density of through holes is 1.67 / cm 2 , the aperture is 6 mesh; in addition, spread a layer of gauze after the bottom of the open container is perforated.

[0095] In fact, the diameter of the upper opening of the open container is within 20±3cm, the diameter of the lower opening is within 15±1cm, the height is within 15±5cm, and the density of through holes is 1.67±0.3 / cm 2 Within 6-10 mesh, the aperture ...

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Abstract

The invention provides a method for treating surplus sludge, a compost product and application. The method for treating the surplus sludge comprises the steps that after the concentration of the surplus sludge is regulated, treatment is performed to obtain earthworm excrement sludge; the earthworm excrement sludge and a conditioner are mixed; earthworms are fed to form compost; after 56 to 63d, the compost product is obtained; the compost product is applied in an efficient agricultural fertilizer or a soil conditioner. The prepared compost product has the advantages that the humification degree of the sludge can be effectively improved; the molecular weight, the polycondensation degree and the aromatization degree of humic acid are improved, so that the sludge after earthworm composting is converted into an excellent agricultural fertilizer. In addition, the conditions required by the reaction process are simple; the reaction can be performed at normal temperature and normal pressure; the flow process is simple and convenient; the control is easy; the operation management and the equipment maintenance are convenient; the engineering cost and the operation cost are greatly reduced; natural advantages are realized on rural sludge with low treated sludge yield and wide distribution.

Description

technical field [0001] The invention belongs to the technical field of biological treatment, and in particular relates to a method for treating excess sludge, a compost product and its application. Background technique [0002] Compared with urban sewage and industrial sewage, rural domestic sewage generally does not contain toxic substances, and the content of nutrients such as COD, nitrogen, and phosphorus in sludge is relatively high. However, the scale of rural sewage treatment is small and the sludge output is small, so it is uneconomical to purchase special equipment for sludge treatment. Therefore, the treatment of rural sludge needs to combine the characteristics of the local natural environment and technical and economic conditions in rural areas, and take advantage of the favorable conditions that the content of heavy metal elements in sludge is far below the critical value of the national standard to build sludge agricultural technology and increase fertilizer sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/80C05G1/00C05F17/80C05F17/40C02F11/02C02F11/121
CPCC02F11/02C02F11/12C02F2303/06C05F3/00C05F17/05C05F17/40C05G3/80C05F7/00Y02W30/40
Inventor 邢美燕郑雅丹肖涛蔡芦子彧陆羽凡王寅杨健
Owner TONGJI UNIV
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