Method for treating surplus sludge, compost product and application

A technology for excess sludge and composting, applied in the direction of sewage/sludge fertilizer, application, special treatment targets, etc., can solve the problems of limited earthworm function, unsatisfactory compost stabilization effect, and long-term and efficient earthworm composting. Achieve the effect of improving the stabilization effect, improving the degree of humification, and facilitating the treatment

Active Publication Date: 2017-06-20
TONGJI UNIV
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  • 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

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  • Method for treating surplus sludge, compost product and application
  • Method for treating surplus sludge, compost product and application
  • Method for treating surplus sludge, compost product and application

Examples

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Effect test

Embodiment 1

[0085] Example 1: A method for treating excess sludge

[0086] The method for treating excess sludge in this embodiment includes the following steps:

[0087] (1) After adjusting the concentration of the remaining sludge through the adjustment tank, the concentration of the remaining 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), pump into the earthworm biological filter tank, 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 get the earthworm sludge, its moisture content 90%, organic matter content (TOC) is 268g / kg, pH is 6.83, conductivity (EC) is 2150us / cm, and C / N is 7.5;

[0088] (2) After mixing the worm manure sludge with the conditioner cow manure in the composting device for 14 days, the moisture content of the cow manure is 21%, the organic matter content (TOC) is 347g / kg, the pH val...

Embodiment 2

[0093] Example 2: Composting device

[0094] The composting device of this embodiment includes: a lid and an open container which are sequentially arranged from top to bottom, and the lid and the open container are detachably connected. Among them, the open container is a round cone-shaped container made of polyethylene plastic, with an upper mouth diameter of 20cm, a lower mouth diameter of 15cm, and a height of 15cm; the lid is evenly distributed with 6 through holes, and the bottom of the open container is evenly distributed with 4 Through holes, the density of through holes is 1.67 pcs / cm 2 , The hole diameter is 6 mesh; in addition, a layer of gauze is laid on the bottom of the open container after perforation.

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

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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 specifically relates to a method for treating surplus sludge and a compost product and 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 the sludge is higher. However, the scale of rural sewage treatment is small and the output of sludge is small. It is not economical to add special equipment for sludge treatment. Therefore, the treatment of rural sludge needs to combine the characteristics of the rural local natural environment and technical and economic conditions, and use the favorable conditions that the content of heavy metal elements in the sludge is far below the threshold of the national standard to construct sludge agricultural technology to increase fertilizer sources for agricultural and forestry ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/04C05G1/00C05F17/00C02F11/02C02F11/12C05G3/80
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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