Biological drying method for treating dewatered sludge of urban sewage plant

A technology of dewatering sludge and biological drying, which is applied in dehydration/drying/concentrated sludge treatment, biological sludge treatment, etc. It can solve the problems of bulky drying equipment, unsatisfactory drying effect, and poor ventilation effect. , to achieve a wide range of waste heat sources, shorten the biological drying time, and realize the effect of heat energy recovery and utilization

Inactive Publication Date: 2010-06-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are not many application cases of biological drying technology, and there are generally disadvantages such as long drying time (generally 2 to 4 weeks), high...

Method used

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  • Biological drying method for treating dewatered sludge of urban sewage plant
  • Biological drying method for treating dewatered sludge of urban sewage plant
  • Biological drying method for treating dewatered sludge of urban sewage plant

Examples

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Effect test

Embodiment 1

[0027] A biological drying treatment method for dewatered sludge from an urban sewage plant, the flow chart of the biological drying treatment when adding an inoculant for inoculation is as follows figure 1 As shown, the method steps are as follows,

[0028] (1) The moisture content of the dewatered sludge is 85-87%. Add lime with a ratio of 10% of the dry weight of the sludge to the sludge as an alkaline cracking agent, mix well, and the weight of the dewatered sludge added to the cracking agent accounts for the total weight of the mixture. 60% of;

[0029] (2) add broken straw again as conditioner, conditioner weight accounts for 35% of mixed material gross weight, adds compost clinker and inoculates as inoculant, and inoculant weight accounts for 5% of mixed material gross weight, makes mixed material moisture content 58-62%, the initial carbon-nitrogen ratio is 25-30:1;

[0030] (3) Stir the mixture evenly and place it in a biological drying reactor. The reactor volume i...

Embodiment 2

[0034] A small-scale project with a scale of 20t / d was established in a sewage treatment plant in Beijing, using a static warehouse-type biological drying reaction tank, intermittent stirring and turning, and waste heat ventilation pipes on the bottom of the warehouse. The flow chart of backflow inoculation with biological drying products is as follows: figure 2 As shown, the steps of the biological drying treatment method for dewatered sludge in urban sewage plants are as follows:

[0035] (1) The moisture content of the dewatered sludge is 80-85%. Add lime with a ratio of 10% of the dry weight of the dewatered sludge to the dewatered sludge as an alkaline cracking agent, mix well, and the weight of the dewatered sludge added with the cracking agent accounts for 55% of the total weight;

[0036] (2) Add broken stalks and sawdust as conditioners again, the conditioner weight accounts for 25% of the total weight of the mixture, wherein the proportion of broken straws is 15%...

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Abstract

The invention discloses a biological drying method for treating dewatered sludge of an urban sewage plant, and belongs to the technical field of solid waste treatment. The method comprises the following steps: adding an alkaline cracking agent into the dewatered sludge, uniformly mixing, adding a conditioning agent, and adding an inoculating agent for inoculation or utilizing a biological drying finished product for reflux inoculation; after uniformly stirring the mixture, placing the mixture in a biological drying reactor, and introducing residual heat, wherein the temperature of hot wind is between 80 and 120 DEG C, the ventilation amount of each 1kg of mixture is between 15 and 150 L/h, and the temperature of the reactor is between 50 and 60 DEG C; connecting a hot wind outlet to a gas drier, removing moisture, and treating and discharging residual gas; and performing once mechanical stirring for 3 to 5 minutes per hour, and treating 3 to 5 days to obtain the treated sludge. The residual heat adopted by the method has wide source; a drying product can be used for fueling, fertilizing, preparing a soil modifying agent or directly dumped; the drying time is remarkably reduced; and the biological drying method has the advantages of simple technology, low cost, economy and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal, and in particular relates to a biological drying treatment method for dewatered sludge in urban sewage plants. Background technique [0002] The treatment and disposal of sludge from urban sewage treatment plants has become one of the urgent environmental problems to be solved in our country. On the one hand, sludge is the largest by-product produced in the process of urban sewage treatment. It has a high water content, is not easy to dehydrate, contains a lot of organic matter, is unstable in nature, easy to rot and smelly, has a high content of toxic and harmful pollutants, and also contains pathogenic bacteria. and parasite eggs, threatening human health. On the other hand, with the development of the economy, the amount of sewage treatment has increased year by year, and the amount of sludge generated has also increased rapidly. At the end of 2007, the daily treatment capacity ...

Claims

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Application Information

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IPC IPC(8): C02F11/14C02F11/02
Inventor 蒋建国杜雪娟杨世辉李春萍
Owner TSINGHUA UNIV
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