CN112174461A

CN112174461A - Treatment method of domestic sludge

Info

Publication number: CN112174461A
Application number: CN202010831412.5A
Authority: CN
Inventors: 陈伟峰; 杨锋
Original assignee: FUZHOU ZUNLONG BIOLOGICAL CULTURE TECHNOLOGY CO LTD
Current assignee: FUZHOU ZUNLONG BIOLOGICAL CULTURE TECHNOLOGY CO LTD
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2021-01-05
Anticipated expiration: 2040-08-18
Also published as: CN112174461B

Abstract

The invention provides a treatment method of domestic sludge, which is characterized in that pennisetum hydridum, pennisetum purpureum or pennisetum hydridum is cut and inserted in the sludge, and the roots of the pennisetum hydridum, the pennisetum hydridum or the pennisetum hydridum are utilized to provide oxygen for earthworms, so that the thickness of the domestic sludge is increased from the original 15cm to 40cm, the survival of the earthworms is ensured, and the aim of improving the production efficiency is fulfilled; the stems and leaves of pennisetum hydridum, pennisetum purpureum or pennisetum hydridum are utilized to accelerate the evaporation of water in the sludge, further guarantee the survival of the earthworms, shorten the water evaporation time and further improve the production efficiency. After the sludge is treated, stems and leaves above pennisetum hydridum, pennisetum purpureum or pennisetum hydridum soil are cut off to be used as pasture.

Description

Treatment method of domestic sludge

Technical Field

The invention relates to the technical field of sludge treatment, in particular to a treatment method of domestic sludge.

Background

The sludge contains toxic and harmful substances such as pathogens, heavy metals, persistent organic matters and the like, so that secondary pollution is easily caused to the environments such as underground water, soil, air and the like, and the environmental safety and public health are directly threatened.

The technology of treating domestic sludge by using earthworms has been widely used. The existing method generally adopts: collecting domestic sludge, putting earthworms in the sludge, waiting for 30-60 days, and allowing the earthworms to swallow the sludge for metabolism, so that the purpose of treating the sludge is achieved, and the treated soil can be used as nutrient soil for fields such as landscaping and flower planting. For example, patent application No. 201210036053.X, and publication No. CN102557370B specifically disclose a method for treating biochemical sludge with earthworms, which is to adopt the method.

However, in the actual sludge treatment process, the thickness of the sludge is about 15cm each time the sludge is treated, since the moisture content in the sludge is generally as high as 80%, when the thickness of the spread sludge is more than 15cm, the earthworms are easy to be anaerobic, i.e. lack of oxygen and die in large quantities, and the purpose of treating the sludge cannot be achieved. In order to ensure the survival of the earthworms and achieve the purpose of sludge treatment, the sludge treatment amount is only within 15cm each time, so that the sludge treatment efficiency is not high enough in unit area and unit time, and further improvement and optimization are needed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method for treating domestic sludge, which is characterized in that pennisetum hydridum, elephantopus scaber or pennisetum hydridum is cut and inserted into the sludge, the root part of the pennisetum hydridum is longer, oxygen is provided for earthworms by the root part of the pennisetum hydridum, and evaporation of water in the sludge is accelerated by blades of the pennisetum hydridum, so that the thickness of the sludge treated each time can reach 40cm, and the production efficiency is.

The invention is realized by the following steps: a method for treating domestic sludge comprises the following steps:

step S1, collecting domestic sludge;

step S2, firstly spreading domestic sludge once, then uniformly spreading earthworms, and then spreading domestic sludge until the total thickness of the domestic sludge is 40 cm;

s3, planting pennisetum hydridum, sweet elephant grass or pennisetum hydridum on the domestic sludge in a pruning and cutting mode;

step S4, waiting for 15-25 days;

s5, cutting stems and leaves above the soil of pennisetum hydridum, elephant grass or pennisetum hydridum, and storing the stems and leaves; then, taking out the processed soil, and screening out earthworms and roots of pennisetum hydridum, pennisetum purpureum or pennisetum hydridum left in the soil, wherein the screened soil, earthworms, and roots of pennisetum hydridum, pennisetum hydridum or pennisetum hydridum are respectively and independently stored.

Further, in the step S4, in summer, the method waits for 15 days; when the winter season is winter, waiting for 25 days; waiting for 15-25 days in spring and autumn.

The invention has the following advantages:

(1) pennisetum hydridum, elephant grass or giant-mycorrhiza grass is cut and inserted in the sludge, and the roots of the pennisetum hydridum, elephant grass or giant-mycorrhiza grass are utilized to provide oxygen for the earthworms, so that the thickness of the domestic sludge is increased from the original 15cm to 40cm, the survival of the earthworms is guaranteed, and the purpose of improving the production efficiency is achieved;

(2) the stems and leaves of pennisetum hydridum, pennisetum purpureum or pennisetum hydridum are utilized to accelerate the evaporation of water in the sludge, further guarantee the survival of the earthworms, shorten the water evaporation time and further improve the production efficiency. After the sludge is treated, stems and leaves above pennisetum hydridum, pennisetum purpureum or pennisetum hydridum soil are cut off to be used as pasture.

Drawings

The invention will be further described with reference to the following examples with reference to the accompanying drawings.

FIG. 1 is a flow chart of the method of the present invention.

Detailed Description

The invention concept of the invention is as follows: on the basis of the prior art, the method is characterized in that the method comprises the steps of pruning and cutting off the sludge, and providing oxygen for earthworms by using roots of pennisetum hydridum, pennisetum purpureum or pennisetum giganteum, so that the thickness of the domestic sludge is increased from the original 15cm to 40cm, the survival of the earthworms is ensured, and the aim of improving the production efficiency is fulfilled; on the other hand, stems and leaves of pennisetum hydridum, pennisetum purpureum or pennisetum hydridum are also utilized to accelerate the evaporation of water in the sludge, further guarantee the survival of earthworms, shorten the water evaporation time and further improve the production efficiency. After the sludge is treated, stems and leaves above pennisetum hydridum, pennisetum purpureum or pennisetum hydridum soil are cut off to be used as pasture.

Please refer to fig. 1.

The invention relates to a treatment method of domestic sludge, which comprises the following steps:

step S1, collecting domestic sludge; operating according to the prior art;

s2, firstly spreading domestic sludge once, then uniformly spreading earthworms, and then spreading domestic sludge until the total thickness of the domestic sludge is 40cm, so that compared with the prior art, the thickness of the domestic sludge can only be 15cm once, the efficiency of sludge treatment in unit time and unit area is doubled; can be spread on the existing sludge treatment device, or a treatment tank is built by the user, and the treatment tank needs to be permeable to air and water.

s4, waiting for 15-25 days, wherein the evaporation area of water in the sludge is greatly increased by stems and leaves of pennisetum hydridum, elephant grass or pennisetum hydridum, and the evaporation of the water in the sludge is accelerated in the process of metabolism of pennisetum hydridum, elephant grass or pennisetum hydridum, so that compared with the prior art that the sludge needs to wait for 30-60 days, the method correspondingly shortens the waiting time, further improves the production efficiency, ensures faster evaporation of the water in the sludge, and further guarantees the survival of earthworms; in step S4, in summer, the time is relatively short, waiting for 15 days, and the temperature is high in summer, so that the water in the sludge evaporates quickly and the metabolism of the earthworms is also vigorous; in winter, the waiting time is 25 days, the temperature in winter is low, the evaporation of water in the sludge is slow, and the metabolism of the earthworms is slow, so the waiting time is relatively long; waiting for 15-25 days in spring and autumn;

step S5, cutting stems and leaves above the soil of pennisetum hydridum, elephant grass or pennisetum hydridum, storing the stems and leaves, and using the stems and leaves as pasture to improve the utilization rate; then, taking out the processed soil, and screening out earthworms and roots of pennisetum hydridum, pennisetum purpureum or pennisetum hydridum left in the soil, wherein the screened soil, earthworms, and roots of pennisetum hydridum, pennisetum hydridum or pennisetum hydridum are respectively and independently stored. Wherein, the treated soil can be used for lawn, flowers, seedling culture medium and landscaping, the earthworms can be recycled, and the roots can be treated harmlessly.

It should be noted that not all plants planted on the sludge can achieve the effect of increasing the thickness to 40cm, but at present, only pennisetum hydridum, elephant grass or pennisetum hydridum is tested successfully by the applicant in the test, and most of the plants have shorter roots and cannot meet the requirement.

Example (b):

0.4 ton of sludge is paved per square, 4-5 kg of earthworms and 80-100 plants of cuttage, pennisetum hydridum, elephantopus scaber and pennisetum hydridum are added.

Summer:

firstly spreading a layer of sludge with the thickness of 15 cm-25 cm in a sludge treatment device, then spreading a layer of earthworms, and finally spreading a layer of sludge until the total sludge thickness is 40 cm; planting pennisetum hydridum on the sludge in a pruning and cutting mode, waiting for 15 days after planting, and finally cutting off stems and leaves of pennisetum hydridum above soil for storage; then screening out soil, earthworms and roots in the soil for classified storage.

The screened soil is used for seed germination, the seed germination rate is 95%, and the requirement is met.

In winter:

firstly spreading a layer of sludge with the thickness of 15 cm-25 cm in a sludge treatment device, then spreading a layer of earthworms, and finally spreading a layer of sludge until the total sludge thickness is 40 cm; planting pennisetum hydridum on the sludge in a pruning and cutting mode, waiting for 25 days after planting, and finally cutting off stems and leaves of pennisetum hydridum above soil for storage; then screening out soil, earthworms and roots in the soil for classified storage.

Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims

1. A method for treating domestic sludge is characterized by comprising the following steps: the method comprises the following steps:

step S1, collecting domestic sludge;

step S4, waiting for 15-25 days;

2. The method for treating domestic sludge according to claim 1, wherein: in step S4, in summer, the method waits for 15 days; when the winter season is winter, waiting for 25 days; waiting for 15-25 days in spring and autumn.