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Method for producing maggot protein and sludge-based soil modifier by treating activated sludge

A technology of soil improver and activated sludge, which is applied in biological sludge treatment, sewage/sludge fertilizer, animal feed, etc., can solve the problems of time-consuming, etc., achieve simplified treatment process, low treatment cost, and realize reduction Effect

Inactive Publication Date: 2011-08-17
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods require sludge pretreatment, which takes a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for processing activated sludge to produce fly maggot protein and sludge-based soil conditioner comprises the following steps:

[0023] (1) Selection of fly maggot species: Lucilia sericata larvae were selected.

[0024] (2) Put the activated sludge with an average moisture content of 65% into a plastic basin with a diameter of 500mm and a height of 150mm. The thickness of the sludge is 70mm, and inoculated with fly maggots. % under environmental conditions, after cultivating for 7 days, separate the fly maggots, dry and pulverize the fly maggots to make fly maggot protein. After 20 experiments, an average of 0.25 kg of fly maggots can be harvested per kg of activated sludge, and 0.06 kg of dry products can be obtained.

[0025] (3) The solid matter after separating the fly maggots was sealed and stacked in an environment of 20-25°C for 6 days to obtain a sludge-based soil conditioner. After the above treatment, the volume of sludge was reduced by an averag...

Embodiment 2

[0027] A method for processing activated sludge to produce fly maggot protein and sludge-based soil conditioner, comprising the following steps:

[0028] (1) Selection of fly maggot species: use the larvae of the fly maggot.

[0029] (2) Put the activated sludge with an average moisture content of 70% into a plastic basin with a diameter of 1000 mm and a height of 150 mm. The thickness of the sludge is 50 mm. Inoculate fly maggots. % under environmental conditions, after cultivating for 6 days, separate the fly maggots, dry and pulverize the fly maggots to make fly maggot protein. After 20 experiments, an average of 0.25 kg of fly maggots can be obtained per kg of activated sludge, and 0.06 kg of dry products can be obtained.

[0030] (3) The solid matter after separating the fly maggots is sealed and composted for 5 days in an environment of 25-30° C. to obtain a sludge-based soil conditioner. After the above treatment, the volume of sludge was reduced by an average of 52%,...

Embodiment 3

[0032] A method for processing activated sludge to produce fly maggot protein and sludge-based soil conditioner, comprising the following steps:

[0033] (1) Selection of fly maggot species: select engineered fly larvae.

[0034] (2) Put the sludge with an average moisture content of 80% into a plastic basin with a diameter of 750 mm and a height of 200 mm. The thickness of the sludge is 60 mm. Inoculate fly maggots at a culture material temperature of 35 ° C and an ambient relative humidity of 80 % Under the environmental conditions of the method, after cultivating for 4 days, the fly maggots are separated, dried and crushed to make fly maggot protein. After 20 experiments, an average of 0.40 kg of fly maggots can be obtained per kg of activated sludge, and 0.12 kg of dry products can be obtained.

[0035] (3) The solid matter after separating the fly maggots is sealed and composted for 3 days in an environment of 25° C. to 35° C. to obtain a sludge-based soil amendment. Af...

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PUM

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Abstract

The invention relates to a method for producing a maggot protein and a sludge-based soil modifier by treating activated sludge, which is characterized by comprising the following steps: (1) selecting the breed of maggots; (2) filling activated sludge in a container, inoculating the maggot, culturing at the culture medium temperature of 20-35 DEG C under the ambient relative humidity of 60-80% for 3-10 days, separating the maggots, drying the maggots to obtain a dried product, and pulverizing the dried product to obtain the maggot protein; and (3) composting the residual solid substance separated from the maggots in a sealed environment at 15-35 DEG C for 3-10 days to obtain the sludge-based soil modifier. The invention effectively overcomes the defects in the fermentation treatment of sludge, simplifies the treatment process of residual sludge, stabilizes and recycles the sludge to change the sludge into harmless substances, can obtain a high-protein feed, and does not produce secondary pollution.

Description

technical field [0001] The invention relates to sludge treatment technology in the field of environmental protection, in particular to a method for producing fly maggot protein and sludge-based soil conditioner by treating activated sludge with ecological technology. Background technique [0002] Activated sludge refers to the product of dehydration treatment of residual sludge in sewage treatment plants. It contains a large amount of nitrogen, phosphorus and other nutrients needed for crop growth and organic matter that can improve soil structure. If not well utilized, it will cause huge pollution to the environment and is also a waste of resources. At present, the sludge anaerobic digestion process and the sludge aerobic digestion process are generally used in the domestic and foreign treatment methods for the remaining sludge of urban sewage treatment plants. Both of these two processes will cause the loss of nitrogen in the sludge, and will also produce bad odors that w...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F11/04C05F7/00A23K1/10
CPCY02A40/20
Inventor 李良关晓彤杨旭鹏于大伟白晓林吴昊
Owner SHENYANG POLYTECHNIC UNIV
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