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Method for releasing and recovering phosphorus in sludge

A recovery method and sludge technology, applied in chemical instruments and methods, combustion methods, sludge treatment and other directions, can solve the problems of unreasonable utilization of phosphate and shortage of phosphorus resources, and achieve improved utilization value, improved dehydration performance, The effect of improving biodegradability

Pending Publication Date: 2020-09-11
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the incineration ash produced is landfilled, and the recyclable part is used as a sintered brick, a substitute for clay production and a raw material for cement, among which valuable phosphates have not been rationally utilized. The incineration ash from sludge Recovering phosphorus from medium can be used as a source for the production of fertilizers and other phosphate products, which can alleviate the current shortage of phosphorus resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for releasing and recovering phosphorus in sludge, mainly comprising the following steps:

[0024] S1. Select a part of sludge from the sludge treatment plant, add polysilicate iron flocculant to the selected sludge at a ratio of 3kg / t, and stir the sludge added with flocculant to speed up the flocculation speed. The setting is 200r / min, the stirring time is 10min, and the stirred sludge is subjected to ultrasonic pretreatment, the ultrasonic frequency is set to 100Hz, the ultrasonic treatment time is set to 10min, and the sludge after ultrasonic pretreatment is mechanically dehydrated , to remove the interstitial water and capillary water in the sludge, so that the water content in the sludge will be reduced to 65%;

[0025] S2. Dry the dewatered sludge after mechanical dehydration at 105° C. for 12 hours to remove the internal adsorbed water and internal water, and grind it into 100-mesh powder by a grinder to make dry sludge for later use;

[0026] S3. Plac...

Embodiment 2

[0030] The difference from the first embodiment is that this embodiment S3 is:

[0031] Place the prepared dry sludge in a crucible, place it in a muffle furnace, set the temperature to 900 and incinerate for 2 hours to obtain sludge incineration ash, cool the incineration ash to room temperature, take the sludge incineration ash and put it in a container, add 0.2mol · L -1 H 2 SO 4 Extraction agent, at 60mL·g -1 Under the condition of liquid-solid ratio, react at room temperature for 2 hours and then centrifuge to obtain a sludge supernatant rich in phosphorus. Through this example, the PO in the supernatant 4 3- -P concentration was tested, and the data obtained was: 38.43mg·g -1 .

Embodiment 3

[0033] The difference from the second embodiment is that this embodiment S3 is:

[0034] Place the prepared dry sludge in a crucible, place it in a muffle furnace, set the temperature to 900 and incinerate for 2 hours to obtain sludge incineration ash, cool the incineration ash to room temperature, take the sludge incineration ash and put it in a container, add 0.6mol · L -1 H 2 SO 4Extraction agent, at 60mL·g -1 Under the condition of liquid-solid ratio, react at room temperature for 2 hours and then centrifuge to obtain a sludge supernatant rich in phosphorus. Through this example, the PO in the supernatant 4 3- -P concentration was tested, and the obtained data was: 42.01mg·g -1 .

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Abstract

The invention discloses a method for releasing and recovering phosphorus in sludge. The method mainly comprises the following steps: adding a flocculant into the sludge, stirring, carrying out ultrasonic pretreatment, and finally carrying out mechanical dewatering; drying the dewatered sludge, and grinding the dewatered sludge by a grinder to prepare dry sludge for later use; incinerating the prepared dry sludge to obtain sludge incineration ash, putting the incineration ash into a container, adding an extracting agent, and performing centrifugal treatment under a certain liquid-solid ratio condition to obtain a sludge supernatant rich in a large amount of phosphorus; adding the obtained supernatant rich in the large amount of phosphorus into a reactor, and performing refined purificationtreatment; and taking the supernatant subjected to fine purification treatment as a stock solution, putting the stock solution into a container, adjusting the pH value, and adding MgCl2. 6H2O to obtain a phosphatized precipitate. The method improves the recovery and utilization rate of phosphorus in the sludge from the source, and is suitable for wide popularization.

Description

technical field [0001] The invention relates to the technical manufacturing field of sludge recycling, in particular to a method for releasing and recovering phosphorus in sludge. Background technique [0002] Phosphorus is an important non-metallic mineral resource that is difficult to regenerate, and one of the most important elements for life activities. At present, my country has 2.7 billion tons of standard phosphate rock reserves, which is only enough to maintain my country's use for about 70 years, and it also contains more than 90% of non-rich phosphate rock. If it is only calculated based on the phosphorus reserves of rich phosphate rocks, it can only last for 10-15 years in my country. [0003] After the sludge is incinerated at high temperature, about 1.7 million tons of incineration ash are produced globally every year. After the phosphorus-rich sludge is dehydrated and incinerated, the phosphorus content in the incineration ash can reach 8%-10%, which can repla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/15C02F11/14F23G5/04F23G5/00C01B25/01
CPCC01B25/01C02F2101/105C02F11/143C02F11/15F23G5/00F23G5/04
Inventor 刘雪瑜魏健王方舟肖书虎杜丛邓齐玉
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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