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Method and appts. for reducing excessive mud

A sludge and expansion device technology, applied in the direction of sludge treatment, biological sludge treatment, chemical instruments and methods, etc., can solve problems such as expensive, difficult to obtain dissolution effect, and difficult to achieve

Inactive Publication Date: 2005-07-13
艾伯股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the method described in the Japanese Patent Application No. H11-128975 published for the first time takes into account the neutralization cost required when returning the dissolved excess sludge to the biological treatment. value of 10.5 or less, so it is difficult to obtain the desired dissolution effect using this method
[0006] The method described in the Japanese patent application No. H11-218022 increases the pH value to 12-13 by improving the neutralization process, thereby improving the dissolution effect, but still requires a lot of time for ultrasonic treatment, which requires Very high ultrasonic output, so very expensive
In addition, it is desirable to retain some of the decomposing ability of microorganisms, which is difficult to achieve in reality at this point

Method used

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  • Method and appts. for reducing excessive mud
  • Method and appts. for reducing excessive mud
  • Method and appts. for reducing excessive mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Under the following conditions, a dissolution test was performed on sludge (from an instrument processing plant) generated during organic sewage treatment using aerobic microorganisms.

[0049] Sludge Concentration: 10050 mg / L, pH 6.3

[0050] pH adjuster: sodium hydroxide

[0051] Initial dissolution pH: 12

[0052] Ultrasonic frequency: 19 Hz, output 400 watts, hold time: 1 minute

[0053] (Using equipment manufactured by Seidensha Electronics Co., Ltd.)

[0054] As an indicator of dissolution, the sludge was separated in a centrifuge (4000 rpm, 10 min) and treated with potassium dichromate (COD Cr ) method of measuring the oxygen consumption rate of recovered liquid at 150°C (according to JIS K0102 standard), the judgment is made on the basis of the measurement of the concentration increase of chemical oxygen demand (COD) in the sludge. This measurement was performed using a colorimeter and a chemical oxygen demand (COD) reactor manufactured by HA...

Embodiment 2

[0065] according to figure 1 The flow chart shown conducts a biological treatment experiment to which effluent from the same food processing plant is added. The experiment is carried out in this way, at room temperature and alkaline conditions (initial pH value of 12), the liquid that has been dissolved by ultrasonic waves and a homogenizer is sent into a flow rate adjustment box without adjusting the pH value, and the effect of biological treatment is observed . The results are shown in Table 2.

[0066] The test conditions are as follows:

[0067] Water flow rate: 50 liters / day

[0068] BOD of water: 1050 mg / l

[0069] Water flow adjustment tank: 50 liters

[0070] Total amount of dissolved sludge: 3.2 times of excess sludge

[0071] Dissolving Agent: Sodium Hydroxide

[0072] Ultrasonic action time: 1 minute

[0073] Pass by

Reasonable water

the quality of

O

A

B

C

D

E

F

BOD(mg / L)

7.5

7.5

7.2

...

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Abstract

The present invention provides a method and apparatus for dissolving excess sludge, which has a high dissolving performance, a low overall cost, and can reduce the size of the equipment. A method for reducing excess sludge comprising adding a dissolving agent to excess sludge produced in microbial treatment of organic sewage, using ultrasonic waves, using a decompression expansion step, and then sending the result back to microbial treatment, thereby Reduce the amount of excess sludge. An apparatus for reducing excess sludge comprising means for adding a dissolving agent to excess sludge generated in microbial treatment of organic sewage, an ultrasonic wave using means using ultrasonic waves; and a reducing means downstream of the ultrasonic wave using means The compression expansion device is used to perform a decompression expansion treatment on excess sludge.

Description

technical field [0001] The present invention relates to a method for reducing excess sludge generated in biological treatment of various organic waste liquids, and a device for reducing excess sludge using the method. Background technique [0002] Organic waste liquid discharged in the form of various industrial waste liquids and civil sewage is mainly treated by biological methods, such as using activated mud. Since the microorganisms used proliferate in this process, a large amount of excess sludge is generated which is problematic for disposal. As a treatment method, these excess sludges are used to improve soil or as compost, but fundamental solutions have not been formed, so that in most cases, excess sludge is dehydrated, incinerated or buried as industrial waste. [0003] However, in recent years, such incineration has been considered to be a possible threat to the environment due to the generation of toxic substances including environmental hormones such as phenoxid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/36C02F3/12C02F11/00C02F11/12C02F11/14
CPCC02F1/36C02F3/1221Y02W10/10C02F11/00
Inventor 张书廷吉村敏机三关邦彦
Owner 艾伯股份有限公司