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Municipal sludge treatment and utilization method

A technology for municipal sludge and sludge, which is applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult recycling, complicated methods, chemical pollution, etc., and achieve significant economic benefits. and social benefits, improve soil fertility, and avoid the effects of enrichment

Pending Publication Date: 2021-02-05
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to provide a municipal sludge treatment and utilization method, which can effectively solve the problems of poor removal of heavy metals in urban sludge, complex methods, chemical pollution, high cost, and difficulty in recycling. The problem of large and reduced sludge fertility

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  • Municipal sludge treatment and utilization method

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Effect test

Embodiment 1

[0030] A kind of municipal sludge treatment utilization method of the present invention comprises the following steps:

[0031] (1), heat treatment:

[0032] In order to eliminate the harm that sludge may cause to the environment, and to avoid the interference of microorganisms in sludge on nitrosifying bacteria and nitrifying bacteria, the municipal sludge was continuously heat-treated at 70°C for 45 minutes to kill the microorganisms in the sludge and improve the quality of sewage. Mud dehydration performance, and then cooled to room temperature 18-25 ℃;

[0033] (2), short-range nitrification reaction:

[0034] Add nitrous bacteria (also known as nitrosative bacteria, nitrosative bacteria agent, commercially available products) to the inactivated sludge, and the amount added is 1.5x10 of the dry sludge. 5 cells / g, when the concentration of dissolved oxygen is controlled at 0.4mg / L, nitrous bacteria can promote the conversion of ammonium nitrogen into nitrite nitrogen, and...

Embodiment 2

[0049] A kind of municipal sludge treatment utilization method of the present invention comprises the following steps:

[0050] (1), heat treatment:

[0051] In order to eliminate the harm that sludge may cause to the environment, and to avoid the interference of microorganisms in sludge on nitrosifying bacteria and nitrifying bacteria, the municipal sludge was continuously heat-treated at 78°C for 32 minutes to kill the microorganisms in the sludge and improve the quality of sewage. Mud dehydration performance, and then cooled to room temperature 18-25 ℃;

[0052] (2), short-range nitrification reaction:

[0053] Add nitrous bacteria (also known as nitrosative bacteria, nitrosative bacteria agent, commercially available products) to the inactivated sludge, the amount added is 1.2x10 of the dry sludge 5 cells / g (dry sludge is the sludge that has dehydrated), and the concentration of dissolved oxygen (DO) is controlled at 0.45mg / L. Nitrite bacteria can promote the conversion ...

Embodiment 3

[0061] A kind of municipal sludge treatment utilization method of the present invention comprises the following steps:

[0062] (1), heat treatment:

[0063] In order to eliminate the harm that sludge may cause to the environment, and to avoid the interference of microorganisms in sludge on nitrosifying bacteria and nitrifying bacteria, the municipal sludge was continuously heat-treated at 68°C for 58 minutes to kill the microorganisms in the sludge and improve the quality of sewage. Mud dehydration performance, and then cooled to room temperature 18-25 ℃;

[0064] (2), short-range nitrification reaction:

[0065] Add nitrous bacteria (also known as nitrosative bacteria, nitrosative bacteria agent, commercially available products) to the inactivated sludge, the amount added is 1.8x10 of the dry sludge 5 cells / g (dried sludge is sludge dehydrated), and the concentration of dissolved oxygen (DO) is controlled at 0.32mg / L. Nitrite bacteria can promote the conversion of ammonium...

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Abstract

The invention relates to a municipal sludge treatment and utilization method which can effectively solve the problems of poor municipal sludge heavy metal removal effect, complex method, chemical pollution, high cost, high recycling difficulty and sludge fertility reduction. The method comprises the following steps: carrying out heat treatment on municipal sludge, adding nitrite bacteria for short-cut nitrification, and centrifuging to realize sludge-water separation, thereby respectively obtaining a water body and sludge; adding the lignin embedded spheres with the diameter of 1-2 mm into thecentrifuged and collected water body, adsorbing heavy metals, recovering the spheres after adsorption equilibrium, realizing recovery of the heavy metals, and purifying the water body; and adding a nitrobacteria inoculant into the sludge obtained by centrifugation, introducing oxygen, and nitrifying to realize sludge reutilization. According to the method, removal and recovery of heavy metals inthe sludge are realized, the treated sludge can be applied as a slow-release nitrogen fertilizer, enrichment of the nitrogen fertilizer in soil can be avoided, the operation is simple, no chemical reagent needs to be added, and the method has the effects of improving the soil fertility and preserving moisture and fertility and does not cause secondary pollution.

Description

technical field [0001] The invention relates to environmental protection, in particular to a method for treating and utilizing urban sludge. Background technique [0002] Municipal sludge is the sediment produced in the process of sewage purification in urban sewage treatment plants. Although its volume only accounts for a relatively small part of the treated sewage volume, the cost of sludge treatment is nearly half of the total operating cost of the sewage plant. With the development of cities and the improvement of people's lives, urban water consumption continues to increase, and the resulting sludge production continues to increase, which not only greatly increases the cost (expenses) of sludge treatment, but also sludge is prone to corruption. Unpleasant odor, due to the high cost of sludge treatment, in order to reduce production costs, most sewage treatment plants use the method of directly discharging wastewater sludge and landfilling it, which makes the sludge har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/127C02F11/02C02F11/18C02F1/28C02F101/20
CPCC02F11/127C02F11/18C02F11/02C02F1/28C02F2101/20
Inventor 李印霞刘碧波曹志林刘帅霞徐晶晶王晓娟史磊范玲
Owner HENAN INST OF ENG
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