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Process for efficient energy-saving resourceful treatment of polyferric sludge with high organic matter content

A high-efficiency, energy-saving, organic matter technology, applied in pyrolysis treatment of sludge, sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of ineffective extraction of iron ions and rational resource utilization, and achieve the effect of reducing energy consumption

Pending Publication Date: 2020-11-17
南京荟智环境科技合伙企业(有限合伙)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above technical problems of inability to effectively extract iron ions and rational resource utilization, the present invention provides a high-efficiency, energy-saving and resource-based process for treating polyferric sludge with high organic content

Method used

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  • Process for efficient energy-saving resourceful treatment of polyferric sludge with high organic matter content
  • Process for efficient energy-saving resourceful treatment of polyferric sludge with high organic matter content
  • Process for efficient energy-saving resourceful treatment of polyferric sludge with high organic matter content

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a high-efficiency, energy-saving and resource-based process for treating polyferric sludge with high organic content comprises the following steps:

[0031] (1) Grinding: Polyferric sludge with high organic matter content and a moisture content of less than 80% is sent to the pulverizer by the sludge conveyor, pulverized by the pulverizer, separated by a vibrating screen, and the sludge larger than 20 meshes is returned to the pulverizer The crushed sludge smaller than 20 mesh is sent to the screw feeder by the sludge conveyor; among them, the polyferric sludge with high organic content is the sludge obtained by polyferric precipitation in the sewage treatment process. The weight ratio of organic matter in polyferric sludge with high organic matter content accounts for 40%. The heat required for sludge pyrolysis can be met without external supplementary energy.

[0032] (2) Pyrolysis: send the mud powder into the disc pyrolyzer through the s...

Embodiment 2

[0039] This example is basically the same as Example 1, and the difference lies in the pulverization step. In order to make the sludge burn more fully, the following method is used to prepare sludge powder: add water to the pretreated polyferric sludge with high organic content and homogenize Disperse to obtain mud with a concentration of 25 degrees Baume, sieve to remove particulate impurities in the mud; pump the mud into the mixing tank of the spray drying equipment through a slurry pump, and spray the mud through the spray head to form fine droplets , when the fine liquid droplets are ejected, they are opposed to the hot air flow in the drying tower to obtain mud powder. Among them, in the atomization pulverization process: the temperature of the hot air flow is 60°C, the flow rate is 600L / h, the spray head adopts a 30KHZ ultrasonic pulverization atomization nozzle, and the moisture content of the mud powder is 8-12%. Finally, the mud powder is sieved, and the mud powder w...

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Abstract

The invention discloses a process for efficient energy-saving resourceful treatment of polyferric sludge with a high organic matter content. The process comprises the following steps: crushing; pyrolysis; preparation of dilute sulphuric acid; preparation of polyferric; and the like. The invention provides the novel process for efficient energy-saving resourceful treatment aiming at the characteristics of wide sources, lack of treatment method and the like of polyferric sludge with the high organic matter content. The method comprises the following steps: crushing and pretreating the polyferricsludge with the high organic matter content, and pyrolyzing the pretreated polyferric sludge in a disc pyrolyzer so as to allow organic matters to be decomposed into gaseous small-molecular substances and ferric sulfate to be decomposed into ferric oxide and sulfur trioxide; then allowing waste gas containing sulfur trioxide to pass through a cooling tower, recycling dilute sulfuric acid and enabling tail gas to enter a tail gas absorption tower; and finally, concentrating dilute sulfuric acid to 50% and subjecting the concentrated dilute sulfuric acid and Fe2O3 generated through pyrolysis toreacting so as to generate polyferric sulfate which can serve as a flocculating agent to return to a sewage treatment system again. Thus, the process of pollutant recycling circulation is achieved, the production and operation cost of sewage treatment is greatly reduced, and meanwhile, the problem that recycled products are difficult to sell is avoided.

Description

technical field [0001] The invention relates to the technical field of iron-containing sludge treatment, in particular to a high-efficiency, energy-saving and resource-based process for treating iron-containing sludge with high organic content. Background technique [0002] With the continuous development of industry, the increasing discharge of industrial wastewater has caused a serious impact on my country's water resources. The serious pollution of water resources makes water resources dry up, endangers people's health, and even restricts the coordinated development of our country's economy. How to reduce pollution discharge and effectively recycle water resources is the key to solving the shortage of water resources. As one of the important operating units of water treatment technology, coagulation sedimentation method provides an important guarantee for alleviating the water resource crisis. Among them, polyferric sulfate is widely used in industrial water supply, pape...

Claims

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Application Information

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IPC IPC(8): C01G49/14C02F11/00C02F11/10C02F101/20C02F101/30
CPCC01G49/14C02F11/00C02F11/10C02F2101/203C02F2101/30Y02W10/40
Inventor 吕路王林平黄前霖张炜铭潘丙才柏益尧
Owner 南京荟智环境科技合伙企业(有限合伙)
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