System and method for preparing phosphate adsorbent by taking residual sludge and biological shell wastes as raw materials

A phosphate adsorbent and excess sludge technology, which is applied in chemical instruments and methods, water pollutants, adsorbed water/sewage treatment, etc., can solve the problems of inability to prepare high-performance phosphate adsorbents, and shorten the time and operation. procedures, avoid inconsistency of operation, and improve the effect of preparation efficiency

Pending Publication Date: 2020-12-08
DONGGUAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] In order to overcome the defect that the phosphate adsorbent with better performance cannot be prepared as described in the prior art, the present invention provides a phosphate adsorbent preparation system using excess sludge and biological shell waste as raw materials. The salt adsorbent preparation system can use excess sludge and biological shell waste to prepare phosphate adsorbent with better performance. The excess sludge is thoroughly treated, which realizes the resource utilization of waste and obtains environmentally friendly products with economic value. The operation of different devices in the preparation system is coordinated with each other, the preparation efficiency is high, and heat recovery can be realized to avoid energy waste

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  • System and method for preparing phosphate adsorbent by taking residual sludge and biological shell wastes as raw materials

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Embodiment 1

[0056] This embodiment provides a phosphate adsorbent preparation system using excess sludge and biological shell waste as raw materials, such as figure 1 As shown, it includes a crushing device 35 for crushing and drying excess sludge and biological shell waste, a ball milling device 36, a water supply device 37, a collecting and conveying device 38, a drying device 39, a storage tank 28, a carbonization device 40, and a gas purification device 23 and backup combustion device 24. The pulverizing device 35, the ball milling device 36, the collection and conveying device 38, the drying device 39, the storage tank 28 and the carbonization device 40 are set up sequentially according to the material processing sequence of crushing, ball milling, transportation, drying, storage and carbonization.

[0057] The pulverizing device 35 comprises a pulverizing chamber 41 and a discharge chamber 9 arranged from top to bottom; The blade 12 and the first driving part 10 for driving the rot...

Embodiment 2

[0070] This embodiment provides a method for preparing a phosphate adsorbent, using the phosphate adsorbent preparation system in Example 1;

[0071] The biological shell waste is oyster shells, and the dry weight ratio of oyster shells to excess sludge is 1:1; the ball milling time is 3.5 hours; the pyrolysis temperature is 800°C, and the pyrolysis time is 2 hours.

[0072] The high-efficiency phosphorus removal biochar prepared in this example is used as an adsorbent to treat phosphorus-containing wastewater with a concentration of 40 mg / L, and the adsorbent is added to the wastewater according to the ratio of wastewater volume (L) to adsorbent mass (g) ratio of 2:1 , adjust the pH to 7, and adsorb at a constant temperature for 24 hours under the condition of 25±0.5°C.

[0073] Through the above operation steps, the phosphorus concentration in the solution was reduced to 5.27 mg / L, that is, the removal rate reached 86.8%, and the adsorption capacity of the modified biochar w...

Embodiment 3

[0075] This embodiment provides a method for preparing a phosphate adsorbent, using the phosphate adsorbent preparation system in Example 1;

[0076] The biological shell waste is egg shells, and the dry weight ratio of egg shells to excess sludge is 1:1; the ball milling time is 3.5 hours; the pyrolysis temperature is 800°C, and the pyrolysis time is 2 hours.

[0077] The high-efficiency phosphorus removal biochar prepared in this example is used as an adsorbent to treat phosphorus-containing wastewater with a concentration of 40 mg / L, and the adsorbent is added to the wastewater according to the ratio of wastewater volume (L) to adsorbent mass (g) ratio of 2:1 , adjust the pH to 7, and adsorb at a constant temperature for 24 hours under the condition of 25±0.5°C.

[0078] Through the above operation steps, the phosphorus concentration in the solution is reduced to 3.76mg / L, that is, the removal rate reaches 90.6%, and the adsorption capacity of the modified biochar is 72.48m...

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Abstract

The invention discloses a system and a method for preparing a phosphate adsorbent by taking excess sludge and biological shell wastes as raw materials. The phosphate adsorbent preparation system comprises a crushing device for crushing and drying residual sludge and biological shell wastes, a ball milling device, a water supply device, a collecting and conveying device, a drying device, a storagetank, a carbonization device, a gas purification device and a standby combustion device. According to the phosphate adsorbent preparation system provided by the invention, the phosphate adsorbent witha good performance can be prepared by utilizing residual sludge and biological shell wastes, the residual sludge is thoroughly treated, the resource utilization of the wastes is realized, an environment-friendly product with economic value is obtained, and different devices of the preparation system are mutually coordinated in operation. The preparation efficiency is high, regenerative utilization can be achieved, and energy waste is avoided.

Description

technical field [0001] The invention relates to the technical field of adsorbent preparation, and more specifically relates to a preparation system and method for a phosphate adsorbent using excess sludge and biological shell waste as raw materials. Background technique [0002] With the acceleration of urbanization, the treatment of urban domestic sewage has become an urgent problem to be solved by the national government. At present, it is the most common way to use the well-developed activated sludge method as the main process of domestic sewage treatment. However, this leads to the generation of a large amount of excess sludge. The excess sludge has a high moisture content, rich organic matter content, a large amount of nutrients such as nitrogen and phosphorus, and heavy metal elements as well as various pathogenic bacteria and pathogenic microorganisms. It often has a pungent odor and is extremely unstable in chemical properties. On the other hand, for a long time, th...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/20B01J20/041C02F1/281C02F1/283B01J2220/4887B01J2220/4881C02F2101/105
Inventor 黄海明李晶赵宁
Owner DONGGUAN UNIV OF TECH
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