Unlock instant, AI-driven research and patent intelligence for your innovation.

A resource utilization process for simultaneously strengthening sludge anaerobic acid production and phosphorus recovery

A phosphorus recovery and recycling technology, applied in the field of sludge recycling, can solve the problems of low phosphorus release efficiency, limited popularization and application, increase Fe-P, etc., to strengthen the anaerobic fermentation of sludge to produce acid, promote organic hydrolysis, Strengthening the effect of anaerobic phosphorus release from sludge

Active Publication Date: 2022-08-05
TONGJI UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as one of the most commonly used sludge treatment methods in the world, anaerobic digestion technology has the problem of low phosphorus release efficiency
In recent years, studies have found that the sulfur ions generated by sulfate radicals under the action of sulfate-reducing bacteria can effectively increase the dissolution of Fe-P, so the addition of sulfate radicals can significantly improve the anaerobic digestion of sludge. release of phosphorus in the process, but the inhibitory effect on methanogenesis limits the popularization and application of this technology

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A resource utilization process for simultaneously strengthening sludge anaerobic acid production and phosphorus recovery
  • A resource utilization process for simultaneously strengthening sludge anaerobic acid production and phosphorus recovery
  • A resource utilization process for simultaneously strengthening sludge anaerobic acid production and phosphorus recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The sludge used in this example is a mixed sludge of activated sludge for biological phosphorus removal from a sewage treatment plant in Suzhou and chemical sludge for enhanced phosphorus removal by iron salts, and its total solids (TS) and volatile solids (VS) are respectively 2.51% and 1.59%, VS / TS=63.34%; the domesticated inoculum has the ability to stably reduce sulfate, where TS=2.50%, VS / TS=44.51%.

[0036] Add 0.125mmol / gTS sodium persulfate to the sludge, at this time the molar ratio S:Fe=0.5, shake at a high temperature of 80°C for 2h, cool to room temperature, the pH of the sludge is reduced from 6.8 to 5.4, use 1M of sodium hydroxide to adjust the sludge pH to 7.0. The pre-oxidized sludge and inoculated sludge were mixed into the anaerobic fermenter at a TS mass ratio of 2:1, and batch experiments were carried out under the conditions of a 37 °C water bath and 100 r / min stirring.

[0037] The contents of volatile fatty acids (VFAs) and dissolved phosphorus w...

Embodiment 2

[0045] The sludge used in the experiment is the primary sludge of a sewage treatment plant for enhanced phosphorus removal by iron salt, in which TS=2.46%, VS=1.53%, VS / TS=62.20%; the domesticated inoculation sludge has the ability to stably reduce sulfate radicals , where TS=2.50% and VS / TS=44.51%.

[0046] Add 0.3mmol / g TS sodium persulfate to the sludge, at this time the molar ratio S:Fe=2, shake at a high temperature of 80°C for 2h, cool to room temperature, the sludge is reduced from 6.5 to 4.5, use 1M of sodium hydroxide to adjust the sludge pH to 7.0. The pre-oxidized sludge and inoculated sludge were mixed into the anaerobic fermenter according to the TS mass ratio of 2:1, and batch experiments were carried out under the condition of 37 °C water bath and 100 r / min stirring.

[0047] The contents of volatile fatty acids (VFAs) and dissolved phosphorus were measured daily during the experiment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
solid contentaaaaaaaaaa
Login to View More

Abstract

The invention relates to a resource recycling process for simultaneously strengthening sludge anaerobic acid production and phosphorus recovery. The process comprises the following steps: (1) pre-processing excess sludge by adopting a thermally activated persulfate pre-oxidation process; (2) Cool the pretreated sludge obtained in step (1) to room temperature, adjust pH, and perform anaerobic fermentation to produce acid; (3) carry out solid-liquid separation on the anaerobic fermentation sludge obtained in step (2); (4) go to step (3) magnesium salt is added to the obtained filtrate, and pH is adjusted, and the precipitation of struvite crystals is obtained by filtration, and phosphorus is recovered, and the remaining filtrate is returned to the sewage treatment plant as a carbon source. Compared with the prior art, the present invention overcomes that the prior art cannot simultaneously meet the requirements of efficient phosphorus release and high value-added recovery in the process of sludge anaerobic recycling; persulfate pre-oxidation can not only strengthen sludge anaerobicity It can release phosphorus; it can also crack the sludge and strengthen the anaerobic fermentation of sludge to produce acid.

Description

technical field [0001] The invention relates to the technical field of sludge recycling, in particular to a recycling process for simultaneously strengthening sludge anaerobic acid production and phosphorus recovery. Background technique [0002] Phosphorus is one of the essential nutrients for all living things. Global population growth and intensive farming practices have led to an average increase in phosphate rock consumption of more than 2% per year. As a non-renewable resource, the long-term stable supply of phosphate rock has become one of the concerns of all mankind. my country is a country with a large population. By 2020, my country's phosphate rock reserves are only 3.2 billion tons, less than 5% of the world's reserves. However, the annual consumption of phosphate rock reaches 50% of the world level. Uneven distribution of resources and huge mining demand make the shortage of phosphorus resources in my country imminent, and phosphorus recovery has become an imp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/06C02F11/00C02F11/127C02F11/122C01B25/45
CPCC02F11/04C02F11/06C02F11/00C02F11/12C01B25/451C02F2209/18C02F2209/06C02F2209/08
Inventor 戴晓虎丁燕燕武博然
Owner TONGJI UNIV