A treatment method for efficient and stable treatment of municipal sludge

A technology for stabilization treatment and municipal sludge, applied in pyrolysis treatment of sludge, fertilizer treatment control, chemical instruments and methods, etc., can solve the loss of easily degradable organic matter, it is difficult to support subsequent heap heating and continuous high temperature, and it is not considered. Excessive temperature, inactivation of functional flora, unfavorable organic matter resources, etc., achieves the effect of reducing heat loss, long duration of high temperature, and cost reduction

Active Publication Date: 2022-06-24
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this invention, the temperature set in the thermal hydrolysis link is relatively high. It is reported that above 160°C is easy to form refractory substances, which is not conducive to subsequent treatment and the utilization of organic resources, and the problem of inactivation of functional flora at too high a temperature is not considered; in addition The press filter dehydration link after the thermal hydrolysis treatment of this invention is very easy to make the loss of easily degradable organic matter difficult to support the subsequent heating up and continuous high temperature of the pile, and this part of the sewage returns to the sewage treatment plant to bring a new load.

Method used

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  • A treatment method for efficient and stable treatment of municipal sludge
  • A treatment method for efficient and stable treatment of municipal sludge
  • A treatment method for efficient and stable treatment of municipal sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The results show that the experimental group 1# has a better stabilization effect. After the experimental group 1# entered the compost, it quickly heated up to above 55 ℃ within 24 hours, and the highest temperature was 65.5 ℃. Compared with the control group, the compost body maintained above 55 ℃ for 1.5 times longer to 5.5 days; the experimental group 1# eventually volatilized The degradation rate of perishable solid organic matter reached 48.75% and the control group 1# was 38.21%; the conductivity of the experimental group changed more drastically and the final conductivity was lower, that is, by reflecting the change of salt content, it indicated that the decomposition of perishable organic matter was more thorough and the final free content The salt content was controlled, and the more significant pH rise of the experimental group further indicated that the conversion of nitrogenous substances was more efficient; the germination index of control group 1# was 53% a...

Embodiment 2

[0041] The results showed that, compared with the control group, the temperature of the 2# pile in the experimental group was more rapid, the time of maintaining above 55 °C was extended by 2 times to 8 days, the highest temperature was 64.6 °C, the degradation rate of volatile organic matter solids increased by 13.6%, and the germination index of the final product was increased. It nearly doubled to 157%, indicating that the phytotoxicity of the finished sludge product was removed and had a certain fertilizer effect.

[0042] Further, compared with the experimental group 1#, the degradation rate of volatile solid organic matter in the experimental group 2# was increased by 10.05%, but the ammonia nitrogen release and biodegradation in the experimental group 2# was still relatively active in the later stage of composting, so the salt content of the final product was Compared with the experimental group 1#, the germination index was lower.

Embodiment 3

[0044] The results showed that the temperature of the experimental group 3# increased rapidly to above 55 °C within 48 hours after entering the compost, and the highest temperature was 62.3 °C. The final volatile solid organic matter degradation rate of 3# was 56.47% and that of control group 1# was 49.01%; the final germination index of control group 3# was 83%, while the germination index of experimental group 3# increased to 123% at the end, and it has an excellent garden. Characteristics of nutrient soils.

[0045] Further, compared with the experimental group 1#, the degradation rate of volatile solid organic matter in the experimental group 3# was increased by 7.72%, and the germination index was increased by 30%; and compared with the experimental group 2#, the final volatile organic matter degradation rate in the experimental group 3# was increased by 7.72%. There is no increase but a decrease of 2.33%, and the germination index decreases by 34%, indicating that the lo...

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Abstract

The invention relates to a treatment method for efficient and stable treatment of urban sludge. The method comprises the following steps: (1) sludge dehydration: adopting mechanical dehydration to make the solid content of the sludge reach 20-25%; (2) hot water Hydrolysis treatment: the dehydrated sludge is subjected to thermal hydrolysis treatment with hot steam in the thermal hydrolysis tank; (3) sludge low-temperature drying: the sludge is dried by hot dry air circulation to form a pile; ( 4) Aerobic composting: Forced ventilation and aeration to the heap to heat up the heap and maintain it for a period of time; then cool down, turn the heap and release the cooling water at the bottom; (5) Collect the finished product. Compared with the prior art, the present invention can carry out the dehydration of sludge without adding any chemical agent. At the same time, during aerobic fermentation, it does not need to use auxiliary materials such as rice husks and sawdust to adjust the water, and uses a fermenter for fermentation. Ultimately realize the reduction, stabilization, harmlessness and resource utilization of sludge.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a treatment method for efficient and stable treatment of municipal sludge. Background technique [0002] At present, with the increasing scale of urban sewage treatment plants, a large amount of municipal sludge is produced. According to incomplete statistics, the annual output of sludge in 2020 will be close to 60 million tons (calculated with a moisture content of 80%). my country's sewage treatment is affected by the tendency of "heavy water and light mud", and the research on sludge pollution control and resource recovery started late, resulting in the problem of sludge treatment and disposal has not been completely solved. In order to prevent secondary pollution to water, soil and atmosphere, sludge stabilization treatment is a necessary link before sludge safe disposal or resource reuse. [0003] The biggest feature of sludge produced by urban sewage treatment plants is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/121C02F11/10C02F11/13C02F11/02C05F7/00C05F17/00C05F17/90C05F17/979C05F17/986C05F17/70
CPCC02F11/121C02F11/10C02F11/13C02F11/02C05F7/00C05F17/00C02F2303/06Y02W30/40
Inventor 戴晓虎唐燕飞
Owner TONGJI UNIV
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