Chlorine dioxide/ultrasonic wave-coupled excess sludge decrement pretreating method

A chlorine dioxide and excess sludge technology, applied in water/sludge/sewage treatment, sludge treatment, sludge oxidation treatment, etc., can solve the problems of high energy consumption and low efficiency of excess sludge, and achieve energy saving. The effect of reducing power consumption, strengthening the degree and effect of cracking, and reducing processing costs

Active Publication Date: 2012-12-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to overcome the shortcomings of low efficiency or high energy consumption of pretreatment of residual sludge with chlorine dioxide or ultrasonic waves alone in the prior art, and provide a chlorine dioxide with high treatment efficiency and relatively low energy consumption. / Ultrasonic coupled excess sludge reduction pretreatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] SBR pilot test system (sequential batch activated sludge process) of a sewage treatment plant in Foshan City, the main device is a 1.5×1.2×0.9m SBR reactor with an effective volume of 1260L, and the operation cycle is 8 hours in total, divided into 5 stages: water inflow (0.5h), aeration (4h), sedimentation (1.5h), drainage (0.5h), idle (1.5h). Discharge mud about 135-200g per cycle. After testing, the properties of the remaining sludge are as follows: the sludge concentration is about 10-20g / L, the soluble COD is 30.02mg / L, the TN is 13.44mg / L, the TP is 2.01mg / L, and the pH is 7.8. Take 1L of sludge liquid in a container, add chlorine dioxide at 2 mg / g of dry sludge, stir with an electromagnetic stirrer, and react for 1 hour under stirring at a speed of 60 r / min, and then perform ultrasonic treatment in an ultrasonic cell pulverizer at an ultrasonic frequency of 20 ~40kHz, ultrasonic sound energy density 0.5W / mL, ultrasonic time 2min. After treatment, the soluble CO...

Embodiment 2

[0023] The SBR pilot system of a sewage treatment plant in Foshan City, the main device is a 1.5×1.2×0.9m SBR reactor, the effective volume is 1260L, the operation cycle is 8 hours, and it is divided into 5 stages: water intake (0.5h), aeration (4h ), sedimentation (1.5h), drainage (0.5h), idle (1.5h). Discharge mud about 135-200g per cycle. After testing, the properties of the remaining sludge are as follows: the sludge concentration is about 10-20g / L, the soluble COD is 25.6mg / L, the TN is 12.5mg / L, the TP is 1.46mg / L, and the pH is 7.05. Take 1L of sludge liquid in a container, add chlorine dioxide at a rate of 4 mg / g dry sludge, stir with an electromagnetic stirrer, and react for 1 hour under stirring at a speed of 80 r / min, and then perform ultrasonic treatment in an ultrasonic cell pulverizer at an ultrasonic frequency of 20 ~40kHz, ultrasonic sound energy density 0.5W / mL, ultrasonic time 6min. After treatment, the soluble COD of the supernatant increased by 787.5%, TN...

Embodiment 3

[0025] The SBR pilot system of a sewage treatment plant in Foshan City, the main device is a 1.5×1.2×0.9m SBR reactor, the effective volume is 1260L, the operation cycle is 8 hours, and it is divided into 5 stages: water intake (0.5h), aeration (4h ), sedimentation (1.5h), drainage (0.5h), idle (1.5h). Discharge mud about 135-200g per cycle. After testing, the properties of the remaining sludge are as follows: the sludge concentration is about 10-20g / L, the soluble COD is 20.15mg / L, the TN is 19.53mg / L, the TP is 3.41mg / L, and the pH is 7.21. Take 1L of sludge liquid in a container, add chlorine dioxide at 2 mg / g of dry sludge, stir with an electromagnetic stirrer, and react for 1 hour under stirring at a speed of 60 r / min, and then perform ultrasonic treatment in an ultrasonic cell pulverizer at an ultrasonic frequency of 20 ~40kHz, ultrasonic sound energy density 1W / mL, ultrasonic time 4min. The soluble COD in the treated sludge increased by 1093.67%, TN increased by 112.6...

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Abstract

The invention discloses a chlorine dioxide / ultrasonic wave-coupled excess sludge decrement pretreating method. The method comprises the following steps of: performing chlorine dioxide treatment on excess sludge produced in the secondary biological sewage treatment process in advance, namely putting chlorine dioxide into sludge solution and stirring by using an electromagnetic stirrer at the rotating speed of 60 to 100r / min, wherein the addition amount of the chlorine dioxide in each gram of dry sludge is 2 to 6 mg and the treatment time is 60 to 90 minutes; and then performing ultrasonication, namely performing ultrasonic treatment on the sludge obtained after the chlorine dioxide treatment, wherein the sound energy density of ultrasound is 0.5 to 1.0W / mL, the action time of the ultrasound is 2 to 6 minutes, and the frequency of an ultrasonic wave is 20 to 40kHz. Compared with a treatment method in which the chlorine dioxide or the ultrasonic wave is independently used, the method hasthe advantages of improving the sludge treatment efficiency, reducing the energy consumption by 3 to 20 percent and reducing the treatment cost and is suitable for sludge decrement treatment in a sewage treatment plant.

Description

technical field [0001] The invention relates to a pretreatment method for reducing the amount of excess sludge in a sewage treatment plant, in particular to a two [0002] Chlorine Oxidation / Ultrasonic Coupled Pretreatment Method for Excess Sludge Reduction. Background technique [0003] Since the activated sludge method was applied to sewage treatment in the early 20th century, it has become the most widely used sewage treatment process in the world. Up to now, more than 90% of the municipal sewage treatment in the world has adopted the activated sludge method. However, the activated sludge method will produce a large amount of excess sludge: due to the metabolism and biosynthesis of microorganisms, the biomass of activated sludge in the aeration tank increases, and part of the sludge settled in the secondary sedimentation tank is returned to the aeration tank. The pool is used for reprocessing sewage, and the excess is discharged out of the system, that is, residual sludg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06
Inventor 胡勇有沈会山王广华梁树焜林嘉添
Owner SOUTH CHINA UNIV OF TECH
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