Sludge utilization method and application

A silt and silt technology, applied in the silt utilization method and application field, can solve the problems of not very prominent environmental benefit, economic benefit, social benefit, single method, cumbersome silt soil utilization and treatment process, etc., achieving significant economic benefits and protection. Planting environment, the effect of facilitating large-scale promotion and application

Pending Publication Date: 2018-11-20

MEILIGUOTU BEIJING ECOLOGICAL ENVIRONMENT ENG TECH RES INST CO LTD

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Problems solved by technology

[0009] However, at present, the land use and treatment process of silt is cumbersome, and the meth...

Method used

Adopt excavator or bulldozer to disperse and pile up silt to carry out leveling, the silt diameter after leveling and crushing is controlled at≤5cm; After leveling, the field block silt laying thickness is uniform, and the field surface does not stay dead angle, and thickness error is in ± (3~5) cm ;Calculate the amount of silt in combination with the thickness and area of mud paving.

Adopt excavator or bulldozer to disperse and pile up silt to carry out smoothing, smooth and broken rear mud diameter is controlled at≤5cm; After smoothing, field piece silt lays even thickness, field surface does not stay dead angle, and thickness error is in ± (3~5) cm ;Calculate the amount of silt in combination with the thickness and area of mud paving.

Because the silt-soil through selection and harmless treatment has constituted complex and stable and is suitable for the ecological system of microbial growth and reproduction, the addition of silt has increased the fertility of soil, has changed soil structure, is conducive to the growth of plant, by This way of treating the sludge and using it in landscaping has good economic, social and environmental values, and has broad application prospects.

CJ/T 340-2016 is stricter and more comprehensive than GB/T 23486-2009, and by selecting the mud that meets GB/T23486-2009 and CJ/T 340-2016 standards simultaneously, it is possible to reduce the amount of mud used for landscaping environmental risk.

Comparative example 2 sludge does not add microbial inoculum when carrying out detoxification treatment, and the growth situation of planting plant is also bad, and the adding of visible fermented inoculum has important effect to improving soil quality, can be effective by adding fermented inoculum Increase the number of beneficial microorganisms in compost, promote the synergy between microbial communities, and form a complex and stable ecosystem suitable for microbial growth and reproduction in the silt-soil mixture, thereby enhancing the degradation activity of microorganisms and effectively accelerating the sludge-soil mixture. The degradation of organic matter in the medium, and to a large extent control the generation of odor, the soil ecosystem is better after the effect, and it is more condu...

Abstract

The invention discloses a sludge utilization method and application, and relates to the technical field of comprehensive utilization of natural water sludge. The sludge utilization method comprises the following steps: performing harmless treatment on sludge which meets the pollutant index requirements in GB/T 23486-2009 'Sludge Characters for Landscaping in Municipal Sewage Treatment Plant SludgeDisposal' and then using the sludge as greening soil, wherein the harmless treatment comprises plowing and curing the sludge stacked on green belt soil and added with a sludge fermentation microbialinoculum, and using the cured soil for planting landscaping plants. By using the method provided by the invention, the defects of complicated land use treatment process, single mode, and unremarkableenvironmental, economic and social benefits of the existing sludge are relieved; and according to the method provided by the invention, the sludge meeting indexes is used as soil for green belts, effective components in the sludge can be fully utilized, shore soil can be improved, the usage amount of chemical fertilizers and humus soil in garden planting can be reduced, the planting environment can be protected, non-point source pollution can be reduced, and sludge resource utilization can be realized.

Application Domain

Growth substratesCulture media +2

Technology Topic

FertilizerMunicipal sewage +12

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Examples

Experimental program(4)
Comparison scheme(2)

Example Embodiment

[0167] The bacterial agents used in Examples 1 and 2 include Lactobacillus, Lactobacillus helveticus, Lactococcus lactis, Streptococcus thermophilus, Bacillus subtilis, Bacillus licheniformis and Candida utilis, in the sludge fermentation inoculum dilution The number of viable bacteria is 2.5 billion/mL, and the ratio of the number of viable bacteria of Lactobacillus, Lactobacillus helveticus, Lactococcus lactis, Streptococcus thermophilus, Bacillus subtilis, Bacillus licheniformis and Candida utilis is 1:1: 2:2:0.5:3:0.5.

[0168] Example 1

[0169] A sludge utilization method includes the following steps:

[0170] 1. Silt detection: Take mixed silt from 0-20cm in the center of a river with a distance of 200 meters, and send the silt to Inspection Technology Service Co., Ltd. for testing. The silt detection results are shown in Table 2.

[0171] Table 2 Mud detection results

[0172]

[0173] Compare the silt test results with "Green Planting Soil" (CJ/T 340-2016) and "Urban Sewage Treatment Plant Sludge Disposal of Landscaping Mud" (GB/T 23486-2009) and the soil nutrient classification standards in Table 1. It can be seen that the content of heavy metals in the sludge is much lower than the heavy metals in "Green Planting Soil" (CJ/T 340-2016) and "Urban Sewage Treatment Plant Sludge Disposal for Landscaping Mud" (GB/T 23486-2009) Content limit, there is no heavy metal pollution. The pH value of the silt is basically neutral, the organic matter content is high, and the cation exchange capacity is high. It meets the standards of "Soil for Landscaping of Sludge Disposal in Urban Sewage Treatment Plants" (GB/T 23486-2009) for greening and planting "Soil" (CJ/T 340-2016) has a level I standard which is much higher than the level II, III, and IV standards. In addition, according to the nutrient grading standard of the second national soil survey (Table 1), the silt is of good quality. Except for the grade 2 standard of available phosphorus, all other indicators have reached the standard of first grade soil nutrient.

[0174] 2. Harmless treatment:

[0175] (1) Leveling of the land

[0176] Use an excavator or bulldozer to level the scattered silt. The average thickness of the silt is 20cm, the silt moisture content is 40%, and the soil moisture content is 17%.

[0177] (2) Spraying microbial agents

[0178] Add appropriate amount of sludge fermentation inoculum to water and mix well, then spray the dilution of the inoculant evenly on the sludge. Plowing should be carried out as soon as possible. The amount of inoculum is 10 kg/mu.

[0179] (3) Plowing of the land

[0180] Use a rotary tillage machine with a depth of 30cm to plow the silt laid in the green belt; the water content of the mixed silt in the second rotary tillage is controlled at about 30%, and the water content of the third rotary tillage is controlled below 20%. During the interval between two rotary tillages, the inoculum was sprayed again; the amount of inoculum was 5 kg/mu. In this embodiment, the mixing ratio of silt to soil is 1:2 (volume ratio).

[0181] (4) Soil maturation link

[0182] After the silt was mixed and rotated for 3 times, the mixed soil was left fallow for 2 months to complete the soil maturation work. After the maturation, the area can be used for planting landscaping plants.

[0183] (5) The matured soil is used for planting cockscomb flowers. The original soil without silt was used for the control experiment. The soil was watered every day. After 60 days, the growth indicators were measured. The growth conditions are shown in Table 3 below.

[0184] table 3

[0185]

[0186]

Example Embodiment

[0187] Example 2

[0188] A sludge utilization method includes the following steps:

[0189] 1. Sludge detection: same as Example 1.

[0190] 2. Harmless treatment:

[0191] (1) Leveling of the land

[0192] Use an excavator or bulldozer to level the scattered silt. The average thickness of the silt is 10cm, the silt moisture content is 28%, and the soil moisture content is 19%.

[0193] (2) Spraying microbial agents

[0194] Add appropriate amount of sludge fermentation inoculant to water and mix well, then spray the diluted inocula evenly on the sludge. Plowing should be carried out as soon as possible. The amount of inoculum is 15 kg/mu.

[0195] (3) Plowing of the land

[0196] Use a rotary tillage machine with a depth of 35cm to plow the silt laid in the green belt; the water content of the mixed silt in the second rotary tillage is controlled at about 40%, and the water content of the third rotary tillage is controlled below 20%. During the interval between two rotary tillages, no bacterial agents are sprayed; in this embodiment, the mixing ratio of silt to soil is 1:3.4 (volume ratio).

[0197] (4) Soil maturation link

[0198] After the silt was mixed and rotated for 3 times, the mixed soil was left fallow for 2.5 months to complete the soil maturation work. After the maturation, the area can be used for planting landscaping plants.

[0199] (5) The matured soil was used for planting cockscomb flowers. The original soil without silt was used in the control experiment. The soil was watered every day. After 60 days, the growth indicators were measured. The growth conditions are shown in Table 4 below.

[0200] Table 4

[0201]

[0202]

Example Embodiment

[0203] Example 3

[0204] A sludge utilization method includes the following steps:

[0205] 1. Sludge detection: same as Example 1.

[0206] 2. Harmless treatment:

[0207] (1) Leveling of the land

[0208] Use excavators or bulldozers to level the scattered silt. The average thickness of the silt is 15cm, the silt moisture content is 35%, and the soil moisture content is 15%.

[0209] (2) Spraying microbial agents

[0210] Add appropriate amount of sludge fermentation inoculant to water and mix well, then spray the dilution of the inoculant evenly on the sludge. Plowing should be carried out as soon as possible. The amount of inoculum is 12 kg/mu.

[0211] (3) Plowing of the land

[0212] Use a rotary tiller with a rotary tillage depth of 40cm to plow the silt laid in the green belt; the water content of the mixed silt in the second rotary tillage is controlled at about 35%, and the water content of the third rotary tillage is controlled below 15%. During the interval between two rotary tillages, no bacterial agents are sprayed; in this embodiment, the mixing ratio of silt to soil is 1:5 (volume ratio).

[0213] (4) Soil maturation link

[0214] After the silt was mixed and rotated for 3 times, the mixed soil was left fallow for 3 months to complete the soil maturation. After the maturation, the area can be used for planting landscaping plants.

[0215] (5) The matured soil is used for planting cockscomb flowers. The original soil without adding silt was used in the control experiment. The soil was watered every day. After 60 days, the growth index was measured. The growth conditions are shown in Table 5 below.

[0216] table 5

[0217] Test index

PUM

Property	Measurement	Unit
The average thickness	20.0	cm
The average thickness	10.0	cm
The average thickness	15.0	cm

Description & Claims & Application Information

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easy to use
reduce transportation

Sludge utilization method and application

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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