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A technology of urban sludge recycling, applied in the field of urban sludge resource utilization, can solve the problems of high moisture content in sludge, achieve good fermentation effect, improve fermentation efficiency, and strong vitality
Inactive Publication Date: 2019-03-15
JIANGSU XIANGYU ENVIRONMENTAL PROTECTION EQUIP +1
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However, when sludge and straw are used as raw materials for the production of organic nutrient soil, it is necessary to eliminate or transform harmful substances in sludge and straw, and solve the problems of high moisture content in sludge
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Embodiment 1
[0018] The method for resource utilization of urban sludge comprises the following steps in sequence:
[0019] 1) Add the sludge into the mixing tank. Usually, the moisture content of the selected sludge is preferably 80±5%. Add a certain proportion of clear water to dilute the sludge, so that the moisture content of the sludge can reach more than 90%, and it should not be diluted too much. Generally, the upper limit of the moisture content reaches 93%. Then, add agent A and mix thoroughly. Agent A is compounded by polymer flocculant and inorganic salt. In this embodiment, polymer flocculant adopts polyferric sulfate, and inorganic salt adopts compound minerals such as calcium oxide, magnesium oxide, and the weight ratio of polymer flocculant and inorganic salt is 1:5, and its preparation method is: polysulfuric acid The medicine A can be prepared by mixing and drying iron and inorganic salt oxygen. Experiments have proved that after adding agent A, heavy metals can be bett...
Embodiment 2
[0024] Hereinafter, on the basis of Embodiment 1, a more specific embodiment will be used for further description.
[0025] Take the original sludge with a moisture content of 85%, put it into the mud pool with an excavator, add water to dilute it to a moisture content of more than 90%, and add 1‰ of the total weight of the sludge. Fully mixed for 20 minutes, sent to the integrated belt filter press, and filtered to make the water content 77.5%. Spread the sludge to a thickness of 10 cm, and dry it naturally for 3 days to obtain a loose sludge cake with a moisture content of 60%.
[0026] Take 100kg of loose sludge cake with a moisture content of 60%, add 500g of α-bacillus, 20kg of wheat straw, and 100g of urea, mix well, stack and have a thickness of 100mm, and cover with plastic cloth. Continue to ferment for 3 days, the center temperature reaches 65°C, turn over the pile, and ferment for another 7 days, keep the temperature at 50°C, turn over the pile for the second time,...
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Abstract
The invention discloses a resource utilization method of urban sludge. The resource utilization method sequentially comprises the following steps: adding sludge to a stirring barrel; adding a certainproportion of clean water to dilute the sludge, so that the water content of the sludge reaches 90% or more; then, adding an agent A to be fully mixed and stirred, wherein the agent A is compounded bya polymer flocculant and an inorganic salt; feeding the sludge into an integrated belt filter press; feeding the sludge added with the flocculant into a filter press for filter-pressing to obtain loose sludge cakes; piling up the loose sludge cakes at a ventilated place at room temperature for naturally drying until the water content is 60-65%; then, adding fermentation probiotics, an organic carbon source and a nitrogen source to be fully mixed and stirred; and performing three stages of fermentation until organic nutrient soil having the water content of 25-35% is obtained. The method has the advantage that the organic nutrient soil with better quality can be prepared.
Description
technical field [0001] The invention relates to the technical field of environmental treatment, in particular to a method for resource utilization of urban sludge. Background technique [0002] With the rapid development of industry, more and more solid wastes are generated. Such as slag, sludge, etc. These substances are classified as waste for disposal, which actually wastes a lot of resources. That is to say, sludge is a reusable substance after reasonable utilization. Making full use of sludge not only saves resources but also reduces the pollution caused by these substances to the environment. Organic nutrient soil can be obtained by fermenting sludge and straw by a special method. Such organic nutrient soil has the characteristics of high organic matter content and sufficient nitrogen, phosphorus, and potassium content. It can be used in landscaping and other industries. It is an economical and applicable soil. organic fertilizer. However, when sludge and straw are...
Claims
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