Method for preparing compound fertilizer from sludge produced by treatment of town sewage

A technology for urban sewage and compound fertilizer, applied in sewage/sludge fertilizer, application, organic fertilizer, etc., can solve problems such as odor generation and slow process, and achieve the effect of ensuring safety and eliminating environmental risks.

Inactive Publication Date: 2010-12-15
CHANGSHA JIEXIANG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of composting is that it is a slow process in bad weather and can produce a foul smell

Method used

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  • Method for preparing compound fertilizer from sludge produced by treatment of town sewage
  • Method for preparing compound fertilizer from sludge produced by treatment of town sewage
  • Method for preparing compound fertilizer from sludge produced by treatment of town sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 The sludge sample was taken from a sewage treatment plant in Hunan, with a water content of 82.3% and a solid content of 17.7%. The composition analysis of the sample for analysis after drying to constant weight at 103-110°C is shown in Table 1:

[0018] The component analysis (mg / Kg) of table 1 sludge sample (dry basis)

[0019]

[0020] Take 2.0Kg of sludge and put it in a beaker, add 1.0L of water, add 0.04L of industrial grade acetic acid with a mass concentration of 93%, heat and stir in a water bath, make the temperature of the slurry reach 60°C and maintain it for 40min, and then solidify the slurry Separate the liquid from the sludge and wash it with 2L of water to obtain sludge and slurry. Add an appropriate amount of lime powder to the sludge and stir evenly to adjust the pH value of the sludge to 6.0. Prepare the sludge with a diameter of 4.5 mm of granule, dried to obtain granule compound fertilizer, the moisture content in the dry granule comp...

Embodiment 2

[0028] Example 2 The sludge sample was taken from the sewage treatment plant in Yuelu District, Hunan Province, with a water content of 80.4% and a solid content of 19.6%. Table 5 shows the component analysis of the sample for analysis after drying to constant weight at 103-110°C.

[0029] The component analysis (mg / Kg) of table 5 sludge sample (dry basis)

[0030]

[0031]

[0032] The treatment method is the same as in Example 1, and 2.0 Kg of sludge is also taken for experimentation. The wet weight and dry weight of the sludge slag obtained in three consecutive experiments are shown in Table 6, the average content of heavy metals in the granular compound fertilizer obtained in the three experiments is shown in Table 7, and the average nutrients in the granular compound fertilizer obtained in the three experiments are shown in Table 6. 8.

[0033] The wet weight and dry weight (Kg) of the sludge residue that table 6 successive experiments obtain for 3 times

[0034]...

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Abstract

The invention relates to a method for preparing a compound fertilizer from sludge produced by treatment of town sewage. The method comprises the following steps of: (1) pretreating the sludge by acidifying; (2) heating and reacting the acidified sludge; (3) separating solid from liquid and washing; (4) neutralizing sludge silt; and (5) preparing the compound fertilizer from the sludge silt. In the compound fertilizer prepared by the method, heavy metals are removed from the sludge so that the use safety of the compound fertilizer prepared from the sludge in agricultural production can be ensured, the environmental risk of the resource utilization of the sludge is eliminated and a precondition is created for large-scale agricultural use of the sludge.

Description

technical field [0001] The invention relates to a method for preparing compound fertilizer, in particular to a method for preparing compound fertilizer with treated sludge from urban sewage. Background technique [0002] Municipal sludge contains a large amount of organic matter and nutrients such as N, K, P and other nutrients such as Ca, Mg, Cu, Zn, Fe, etc., which can not only be used as nutrients for plant growth, but also improve soil structure and increase Soil fertility, which promotes the growth of crops, is a fertilizer that works well. [0003] Because organic matter plays an irreplaceable role in other nutrients in soil fertility, it is often used as an index to classify soil fertility. It is generally believed that organic matter greater than 1.7% is high fertility, and less than 1.2% is low fertility. After the founding of new China, my country's chemical fertilizer industry has developed rapidly, and the structure of crop fertilization has also undergone fund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00
CPCY02A40/20
Inventor 唐子君李和平周旋辉陈俊飞熊乐良
Owner CHANGSHA JIEXIANG ENVIRONMENTAL ENG
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