Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recovering phosphorus in sewage sludge

A sludge and acid process technology, applied in the preparation of phosphorus, sludge treatment, chemical instruments and methods, etc., can solve the problems of complex process flow, single product, environmental pollution, etc., achieve simple process, realize recycling, consumption low effect

Inactive Publication Date: 2013-07-03
施一飞
View PDF0 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Generally speaking, the above sludge phosphorus recovery process has the advantages of high phosphorus recovery rate and sludge reduction, but there are still some problems: such as ① high cost of energy consumption; ② complex process; ③ relatively single product; ④ possible environmental pollution

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
  • Method for recovering phosphorus in sewage sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be further elaborated below with examples, such as figure 1 Shown.

[0026] As an embodiment of the present invention, first add water to a certain amount of sludge, stir evenly, and adjust the pH to 10 with NaOH. The ultrasonic conditions are: working for 4s, intermittently for 1 second, and working continuously for 60 minutes;

[0027] Then, take the supernatant after sludge digestion and add appropriate amount of CaCl 2 Solution, and stir with a stirrer, adjust the pH to 10, after reacting for 5-10 minutes, stop stirring and let it stand;

[0028] The temperature of phosphorus in the supernatant liquid of the recovered sludge was 25°C.

[0029] The stirring frequency of the aforementioned stirrer is 120 rpm.

[0030] The recovery rate of phosphorus in sludge can reach 80%.

[0031] As another embodiment of the present invention, first add 10% HCl to a certain amount of sludge, stir evenly, and react for 2h; then, take the supernatant after sludge dig...

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

No PUM Login to View More

Abstract

The invention discloses a method for recovering phosphorus in sewage sludge. The method comprises the following steps: digesting a certain amount of the sewage sludge at first so as to allow the phosphorus to be released to a solution from the sewage sludge, wherein a digestion method can be one selected from the group consisting of an ultrasonic method, a heating method and an acid addition method or be a combined method of the heating method and the acid addition method ultrasonic method; and then, recovering the phosphorus resource in supernatant of the sewage sludge having undergone digestion, wherein a recovery method is to recover phosphorus in the supernatant of the sewage sludge through precipitation with a CaCl2 solution or through precipitation with seawater used as a magnesium source. With such a technical scheme, the method provided by the invention has the advantages of a simple process, low energy consumption, economic efficiency and social significance.

Description

Technical field [0001] The invention relates to sewage recovery, in particular to a method for recovering phosphorus in sludge. Background technique [0002] Phosphorus not only has important application value in agricultural production, but also plays a very important role in industry, medicine, and biology. It is used in feed, metal processing, electroplating, building materials, flame retardant fire fighting, petrochemicals, geological prospecting, etc. It has a wide range of applications in all aspects. Therefore, the human demand for it is huge. However, all the current signs indicate that the continuous supply of phosphorus-related products will decline, and the production cost will continue to rise. Phosphorus in the water body mainly comes from feces, detergents and some industrial wastewater, mainly in three forms, polyphosphate and organic phosphorus. Phosphate discharged from detergent accounts for about the total phosphorus pollution load. At present, there are ma...

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
IPC IPC(8): C02F11/00C01B25/02
Inventor 施一飞
Owner 施一飞
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com