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Method of improving quality of settled water from sludge return process by ultrasonic wave

A sludge return and ultrasonic technology, applied in water/sludge/sewage treatment, sludge treatment, chemical instruments and methods, etc., can solve the problem of increased sedimentation tank load, accumulation of pathogenic microorganisms, and reflocculation floc settlement performance To reduce the treatment load, improve water quality, and improve water supply safety

Inactive Publication Date: 2014-01-08
CHENGDU DUCHENG ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for solving the accumulation of toxic and harmful substances such as organic matter and pathogenic microorganisms in the sludge reflux process of a water purification plant, as well as the increase in the load of the sedimentation tank during the reflux process and the deterioration of the settling performance of reflocculation flocs, etc.

Method used

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  • Method of improving quality of settled water from sludge return process by ultrasonic wave

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Experimental program
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Effect test

Embodiment 1

[0025] The total solid mass concentration of the sludge entering the ultrasonic treatment equipment is 1300mg / L, and the COD in the supernatant Cr The concentration of E. coli and fecal E. coli in the initial sludge were 1.25×10 4 ,407CFU / mL, the particle size of sludge floc is 25.66μm. After the ultrasonic frequency is 25KHz, the sound energy density is 23.3W / L (power is 350W, sludge volume is 15L), after 30 minutes of action, the COD in the supernatant Cr Increased to 67.45mg / L, the dissolution rate reached 539%, which was 6.4 times the initial concentration; the inactivation rates of Escherichia coli and fecal Escherichia coli were 23.5% and 30.2% respectively; up to 20.4%. The sludge after ultrasonic treatment is re-concentrated through the sludge re-concentration device, the re-concentration coefficient is 0.6, the solid content rate is 0.095w / w%, and then the stirring blade is started at a speed of 50rpm, and the volume reflux ratio is 8%. Raw water with an initial tu...

Embodiment 2

[0027] The total solid mass concentration of the sludge entering the ultrasonic treatment equipment is 1300mg / L, and the COD in the supernatant Cr The concentration of E. coli and fecal E. coli in the initial sludge were 1.25×10 4 ,407CFU / mL, the particle size of sludge floc is 25.66μm. After the ultrasonic frequency is 40KHz, the sound energy density is 30W / L (the power is 450W, and the sludge volume is 15L), after 15 minutes of action, the COD in the supernatantCr Increased to 77.45mg / L, the dissolution rate reached 634%, which was 7.3 times the initial concentration; the inactivation rates of Escherichia coli and fecal Escherichia coli were 20.5% and 35.2% respectively; up to 22.7%. The sludge after ultrasonic treatment is re-concentrated through the sludge re-concentration device, the re-concentration coefficient is 0.6, and the solid content rate is 0.12w / w%. For the raw water with an initial turbidity of 3.50NTU, the turbidity of the sinking water increased from 69.69%...

Embodiment 3

[0029] The total solid mass concentration of the sludge entering the ultrasonic treatment equipment is 4500mg / L, and the COD in the supernatant Cr was 27.59mg / L, and the concentrations of E. coli and fecal E. coli in the initial sludge were 2.31×10 4 ,609CFU / mL, the particle size of sludge floc is 22.66μm. After the ultrasonic frequency is 125KHz, the sound energy density is 30W / L (the power is 450W, and the sludge volume is 15L), after 20 minutes of action, the COD in the supernatant Cr Increased to 167.45mg / L, the dissolution rate reached 507%, which was 6.1 times the initial concentration; the inactivation rates of Escherichia coli and fecal Escherichia coli were 24.5% and 39.2% respectively; up to 24.9%. The sludge after ultrasonic treatment is re-concentrated through the sludge re-concentration device, the re-concentration coefficient is 0.75, and the solid content rate is 0.18w / w%. For raw water with an initial turbidity of 20.0NTU, the turbidity of the sinking water ...

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Abstract

The invention relates to a method of improving quality of settled water from the sludge return process by ultrasonic wave, belongs to the field of drinking water treatment and especially applies to enhanced coagulation in urban water treatment plants using lakes and reservoirs as water resources. Equipment comprises a mixing tank, a flocculating tank, a settling tank, a sludge storage tank, an ultrasonic treatment unit and a sludge re-thickening device, wherein all devices are connected in sequence. 10-15% of sludge in the sludge storage tank is used as return sludge entering the ultrasonic treatment unit and is treated with the ultrasonic wave under the ultrasonic frequency 25-160 KHz and sound energy density 23.3-30.0W / L for 15-30 minutes before being thickened by the sludge re-thickening device, under the re-thickening coefficient 0.6-0.8; the ultrasonically-re-thickened sludge 0.095-0.20w / w% in solid content is returned to the flocculating tank to enhance coagulating effect and improve the quality of settled water. The method has the advantages that organics and pathogenic microorganisms dissolved by ultrasonic cracking can be discharged out of a return system effectively; the method is significant to improving the quality of settled water, reducing treatment load of subsequent process, and guaranteeing water supply safety.

Description

Technical field: [0001] The invention belongs to the field of drinking water treatment, and particularly relates to a method for improving the water quality after the sludge reflux process of a water purification plant, specifically refers to the further natural settlement of the sludge after ultrasonic pretreatment, and then reflowing after concentration to strengthen coagulation Effect, improve water quality after sinking. The invention is particularly suitable for enhanced coagulation treatment in urban water purification plants using lakes and reservoirs as water sources. Background technique: [0002] As an effective technology to strengthen the conventional coagulation process of low-turbidity and slightly polluted source water, sludge return in water purification plants has become a research and application hotspot in recent years, and it is also an important form of sludge recycling. The post-sinking water quality of the sludge return process consists of the removal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 杨艳玲周志伟李星王伟强赵荔马长红
Owner CHENGDU DUCHENG ENVIRONMENTAL PROTECTION CO LTD
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