Method for recycling excess sludge of municipal sewage plant

A technology for excess sludge and municipal sewage, which is applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc. Land resources, economical and reasonable effects of design

Active Publication Date: 2019-11-15
四川省环保产业集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on this, it can be seen that landfill is still the main method of sludge treatment in my country, and the degree of resource utilization is very low. In addition, the disposal capacity of urban sewage treatment enterprises in my country is insufficient and the disposal methods are backward, and a large amount of sludge has not been treated in a standardized manner. Directly caused "secondary pollution" and had a serious impact on the environment
[0003] There are many sewage treatment plants in our country that only carry out simple concentration and dehydration on the sludge and then transport it abroad, and have not explained the final destination of the sludge, but even if the sludge is concentrated and dehydrated, it is often not achieved. requirements, the moisture content of sludge is high, and improper sludge treatment not only increases the difficulty of transportation, but also poses a potential threat to the surrounding environment of the transportation route
What's more serious is that it will bring great inconvenience to the subsequent sludge disposal: during composting treatment, due to the high water content, it cannot meet the requirements of composting treatment, and there may also be problems of excessive heavy metals and secondary pollution, which cannot meet the requirements of composting treatment. Standardized and standardized production; when landfilling, the access conditions for landfills cannot be met, and many landfills refuse to accept sludge; when incinerating, due to inadequate treatment, the calorific value of sludge incineration cannot be reached At the same time, it will consume too much heat, and may also cause serious air pollution and other problems.

Method used

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  • Method for recycling excess sludge of municipal sewage plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the present embodiment, the modified zeolite is prepared, and the steps are as follows:

[0037] Pulverize the natural zeolite, pass it through a 100-mesh sieve, soak the pulverized and sieved natural zeolite in a 1 mol / L sulfuric acid solution for 10 hours, wash it with deionized water to remove the sulfuric acid, dry it at 105 °C, and then place it in a 15 mol / L solution. The hexadecyltrimethylammonium bromide solution was stirred at a constant temperature of 25 ± 2 °C for 6 hours, washed with deionized water to remove the cetyltrimethylammonium bromide, dried at 105 °C, and then placed in 1mol / LCuSO 4 Soak in the solution for 10h, and dry at 105°C to obtain modified zeolite, numbered as 1# modified zeolite.

[0038] The natural zeolite was pulverized and passed through a 200-mesh sieve. The pulverized and sieved natural zeolite was soaked in a 0.5mol / L sulfuric acid solution for 12 hours, washed with deionized water to remove the sulfuric acid, dried at 105°C, a...

Embodiment 2

[0041] In this embodiment, taking the excess sludge produced by an urban domestic sewage treatment plant in a city in Guangdong Province as an example, the method for recycling excess sludge is described. The steps are as follows:

[0042] (1) The excess sludge is sent to the acidification mixing tank, the TS concentration of the sludge in the acidification mixing tank is adjusted to 10%, the pH value is 4.5, and the ultrasonic wave with the energy density of 0.05W / mL is used for 30s, and then the energy density is Microwave treatment at 1.0W / mL for 30s; then add the crushed straw that has passed through a 10-mesh sieve, and the amount of the crushed straw should be such that the dry matter mass of the crushed straw is 5% of the sludge mass in the acidification mixing tank; The 1# modified zeolite prepared in Example 1 was added to the acidification mixing tank, and the dosage of 1# modified zeolite was 0.5% of the mass of the sludge in the acidification mixing tank, and the he...

Embodiment 3

[0049] In this embodiment, taking the excess sludge produced by an urban domestic sewage treatment plant in a certain city in Guizhou Province as an example, the method for recycling excess sludge is described. The steps are as follows:

[0050] (1) The excess sludge is sent to the acidification mixing tank, the TS concentration of the sludge in the acidification mixing tank is adjusted to 10%, the pH value is 5, and the ultrasonic wave with the energy density of 0.5W / mL is used for 20s, and then the energy density is 3.0W / mL microwave treatment for 30s; then add manure residue, the amount of manure residue added should be 25% of the sludge mass in the acidification blending tank as the dry matter mass of the manure residue; then add the prepared by Example 1 to the acidification blending tank. 2# modified zeolite, the dosage of 2# modified zeolite is 1.5% of the sludge mass in the acidification mixing tank, and the heavy metal ions in the sludge are subjected to adsorption and...

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Abstract

The invention provides a method for recycling excess sludge of a municipal sewage plant. The method comprises the following steps: (1) feeding the excess sludge into an acidification and mixing tank to adjust TS concentration and pH value of the sludge, then carrying out ultrasonic wave and microwave treatment, adding crushed straws or/and fecal residues, and then adding a solidification stabilizer to carry out adsorption passivation treatment on heavy metal ions in the sludge; (2) carrying out anaerobic fermentation; (3) dehydrating and desulfurizing biogas generated by anaerobic fermentation, delivering the biogas into a double-membrane gas storage cabinet, and generating electricity by utilizing the biogas; (4) sterilizing the sludge generated by anaerobic fermentation and carrying outsolid-liquid separation to obtain biogas residue mud cakes and biogas slurry; (5) returning part of the biogas slurry to the acidification and mixing tank, and carrying out nitrification and denitrification treatment on the rest biogas slurry to reach the standard and then discharging the biogas slurry; and (6) adding nutrient elements into the biogas residue mud cakes, and drying and granulatingthe biogas residue mud cakes to obtain a granular organic fertilizer. According to the method, the environmental protection property of an existing excess sludge treatment method can be improved, theresource utilization degree of the excess sludge can be improved, and the treatment energy consumption of the excess sludge can be reduced.

Description

technical field [0001] The invention belongs to the field of surplus sludge recycling, and relates to a method for recycling surplus sludge in a municipal sewage plant. Background technique [0002] In 2014, the sludge produced by domestic sewage treatment plants in my country was more than 35 million tons per year, and the annual growth rate was more than 4%. In 2015, the average rate of harmless treatment of wet sludge in various regions of my country was 32%. Relevant data show that the current sludge treatment methods in my country mainly include landfill, composting, natural drying, incineration, etc. The proportion of these four treatment methods is 65%, 15%, 6%, and 3% respectively. According to this, it can be seen that the sludge treatment method in my country is still mainly landfill, and the degree of resource utilization is very low. In addition, the disposal capacity of urban sewage treatment enterprises in my country is insufficient and the disposal methods ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04C02F11/121C02F3/30C02F101/20
CPCC02F11/008C02F11/04C02F11/121C02F3/302C05F3/00C02F2101/20Y02E50/30
Inventor 张忠武刘明刚涂弈州闫志英
Owner 四川省环保产业集团有限公司
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