TWI675009B - Sludge degradation method by using homogenizer and ozone - Google Patents

Abstract

A sludge reduction method using a homogenizer and ozone, including at least the following steps: providing a homogenizer; providing an ozone reactor for generating an ozone; and performing a sludge reduction on a sludge by using the homogenizer and ozone simultaneously. Processing steps. This sludge reduction method can improve sludge treatment efficiency.

Description

Sludge reduction method using homogenizer and ozone

The invention relates to a method for reducing sludge, in particular to a method for reducing sludge by using a homogenizer and ozone.

The amount of sludge produced in Taiwan each year is far greater than the supply that can be buried, resulting in a large increase in the amount of sludge accumulated each year. With the increasingly serious water pollution, it is imperative to carry out economic and effective treatment of various sewage.

Chinese patent application publication CN101481191A discloses a sewage treatment method for sludge reflux digestion and reduction, in which the remaining sludge is returned to the anaerobic sedimentation tank for a long-term accumulation in the sedimentation sludge area at the lower part of the anaerobic sedimentation tank to reduce sludge digestion, After the sewage feed is passed through the anaerobic sedimentation tank, the sewage is treated to obtain purified water and excess sludge. Undigested sludge needs to be removed regularly.

United States Patent Application Publication US2002 / 0030003A1 discloses an activated sludge sewage treatment system and method, in which sewage is treated with sludge in a contact tank, and then sludge and water are separated in a solid-liquid separator, and the separated sludge and parts The sewage is mixed in the digestion tank and aerated to reduce the sludge digestion. The aerated mud-water mixture is partially returned to the contact tank and partially discharged.

The traditional activated sludge method also has the following disadvantages: (1) low biological concentration in the aeration tank; (2) poor water resistance and water shock load capacity, and unstable operation; (3) easy to produce sludge swelling; (4) Large sludge production; (5) High capital construction and operating costs, large area, etc.

In particular, the most striking problem of the existing sewage biological treatment process is the generation of large amounts of residual sludge. The cost of sludge treatment is unusually high, accounting for about 50% to 60% of the total cost of construction and operation of the sewage treatment plant. The remaining sludge requires necessary disposal, which increases the operating cost of sewage treatment, and also limits the choice of sludge treatment methods. Common methods of sludge reduction include digestion (including anaerobic digestion and aerobic digestion), sludge combined with aeration to reduce sludge digestion, and the aerated mud-water mixture is partially returned to the contact tank and partially discharged.

In summary, the sludge in Taiwan is currently the main landfill, but currently the landfill in Taiwan is saturated, and the cost of incineration is too high. Therefore, new sludge treatment methods still need to be developed to solve the above problems.

In view of the problems of the above-mentioned conventional techniques, an object of the present invention is to provide a sludge reduction method using a homogenizer and ozone to solve the lack of existing sludge treatment methods.

In order to achieve the foregoing object, the present invention proposes a method for reducing sludge by using a homogenizer and ozone, including at least the following steps: providing a homogenizer; providing an ozone reactor for generating an ozone; A sludge reduction step is performed.

Among them, in the sludge reduction step, the speed of the homogenizer is between 5,000 rpm and 9,000 rpm.

Among them, in the sludge reduction treatment step, the amount of ozone is substantially 0.05 g / g MLSS.

The treatment time of the sludge reduction treatment step ranges from 15 minutes to 75 minutes.

Among them, the sludge reduction rate of the sludge reduction treatment step is between 31% and 59%.

Among them, in the sludge reduction treatment step, the rotation speed of the homogenizer is substantially 8,000 rpm, the amount of ozone is substantially 0.05g / gMLSS, the treatment time is substantially 60 minutes, and the sludge reduction rate is 57%.

Among them, the organic content of sludge is substantially higher than 87%.

Among them, the organic content of the sludge was substantially 87.2%, and the pH value was 7.13.

As mentioned above, the sludge reduction method using a homogenizer and ozone according to the present invention may have one or more of the following advantages:

(1) The sludge reduction method using a homogenizer and ozone according to the present invention, by performing a sludge reduction treatment step with a homogenizer and ozone, the sludge treatment efficiency can be effectively improved.

(2) The sludge reduction method using the homogenizer and ozone of the present invention, by setting the homogenizer to an appropriate rotation speed, combined with an appropriate amount of ozone and an appropriate reaction treatment time, the sludge treatment efficiency can be optimally improved .

In order to enable Junshen to have a further understanding and understanding of the technical features and technical effects of the present invention, I would like to refer to the preferred embodiments and the detailed description below.

S10, S20, S30‧‧‧ steps

40‧‧‧ Homogenizer

42‧‧‧Safety Clamp

44‧‧‧Reactor

46‧‧‧Rotating parts

50‧‧‧ozone reactor

52‧‧‧Gas pipeline

60‧‧‧speed controller

FIG. 1 is a schematic flowchart of a sludge reduction method using a homogenizer and ozone according to the present invention.

FIG. 2 is a schematic diagram of equipment used in the sludge reduction method using a homogenizer and ozone according to the present invention.

In order to better understand the technical characteristics, content and advantages of this creation and the effect that it can achieve, we will combine this creation with diagrams and use the expressions of the embodiments to explain in detail below. The main purpose of the diagrams used is only For the purpose of indicating and assisting the manual, the actual scale and precise configuration after the implementation of the creation may not be interpreted and the scope of the rights of the actual implementation of the creation should not be interpreted or restricted in relation to the proportion and configuration of the attached drawings. In addition, in order to facilitate understanding, the same elements in the following embodiments are described with the same symbols.

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic flow chart of a method for reducing sludge by using a homogenizer and ozone according to the present invention, and FIG. 2 is a schematic view of a device using the method of reducing sludge by using a homogenizer and ozone according to the present invention . As shown in FIG. 1 and FIG. 2, the sludge reduction method using a homogenizer and ozone according to the present invention includes at least the following steps S10 to S30. In step S10, a homogenizer 40 is provided. In step S20, an ozone reactor 50 is provided to generate an ozone. In step S30, a sludge reduction treatment step is performed on the sludge simultaneously with the homogenizer 40 and ozone.

The present invention uses a homogenizer 40 and an ozone reactor 50 to carry out sludge reduction treatment. The homogenizer 40 is an example of a homogeneous machine purchased from Shinko Seiki and the model is HM-0025. The operating speed of the homogenizer 40 can be controlled, for example, by the speed controller 60, which can adjust the rotation speed steplessly. The speed (RPM) of the homogenizer 40 can range from 500 rpm to 11,000 rpm, and the rotation speed is preferably Between 5,000 rpm to 9,000 rpm. Since the homogenizer 40 can cause the machine to overheat at more than 8,000 revolutions per minute, it does not increase costs (such as adding cooling equipment) and obtain a good sludge reduction rate, so the rotation speed is more preferably 8,000 revolutions per minute.

The homogenizer 40 may be provided with, for example, safety clamps 42 for holding the reaction vessel 44, the reaction vessel 44 for placing sludge to be reacted, and the rotating part 46 of the homogenizer 40 is The reaction vessel 44 is extended to homogenize the sludge.

The ozone reactor 50 is an example purchased from Deng's Enterprise Co., Ltd. and the model is, for example, OWA-1000 ozone machine, which can adjust the ozone generation amount in a stepless manner, and the ozone generation amount ranges from 0 g / hr to 1 g / hr. The amount of ozone generation is preferably from 0.1 g / hr to 1 g / hr, and the preferred amount of ozone is 0.05 g / g MLSS. The ozone reactor 50 may be in communication with the homogenizer 40, for example. For example, the ozone generated by the ozone reactor 50 can be passed into the reaction vessel 44 through the gas pipeline 52, so that the ozone can uniformly contact the sludge during the sludge reduction process. In the present invention, the properties of the sludge are as follows: Mixed Liquid Suspended Solids (MLSS) is 18,850 mg / L, and Mixed Liquid Volatile Suspended Solids (MLVSS) is 16,433 mg / L, MLVSS / MLSS (%) was 87.2, and the pH was 7.13. Those with an organic matter content of 87% or more are suitable for sludge reduction.

The table shows a series of results of sludge reduction with different speeds of the homogenizer and ozone. Among them, the amount of sludge was 200 mL, the MLVSS / MLSS (%) of the sludge was 87.2, the pH value was 7.13, and the ozone amount of ozone was 0.05 g / g MLSS. The homogenizer was used to reduce the sludge for 30 minutes at different speeds (5,000 rpm, 6,000 rpm, 7,000 rpm, 8,000 rpm, 9,000 rpm) and ozone. The reduction rates were 24%, 34%, 38%, 43%, and 46%, respectively. As the speed of the homogenizer is too high, the machine is likely to overheat, so the speed of the homogenizer is preferably 8,000 rpm.

Table 2 shows the results of sludge reduction by using a homogenizer with different ozone reaction times. Among them, the amount of sludge is 200mL, the MLVSS / MLSS (%) of the sludge is 87.2, the pH value is 7.13; the ozone amount of ozone is 0.05g / gMLSS; the rotation speed of the homogenizer is 8,000 rpm, which is performed for 15 minutes, 30 Minute, 45 minutes, 60 minutes, and 75 minutes of sludge reduction treatment, the sludge reduction rate was 31%, 43%, 52%, 57%, 59%. From the chart, it can be known that the sludge reduction of 57% can be obtained when the reaction time is 60 minutes, and the sludge reduction rate is only increased from 57% to 59% when the reaction time is 75 minutes, which indicates that the reaction time is preferably 60 minutes.

In addition, the present invention further compares sludge reduction rates for various sludge reduction methods. Among them, the amount of sludge is 200mL, the MLVSS / MLSS (%) of the sludge is 87.2, the pH value is 7.13; the ozone amount of ozone is 0.05g / gMLSS; the speed of the homogenizer is 8,000 rpm; the reaction time is 30 minutes. In detail, when the sludge was treated with ozone alone, the sludge reduction rate was 29%. When using a homogenizer alone to treat sludge, the sludge reduction rate is 18%. However, in the present invention, the sludge reduction rate is 43% by using an ozone homogenizer to jointly treat the sludge. In comparison, the sludge reduction rate obtained by using the homogenizer and ozone sludge reduction method of the present invention can be increased by 1.48 times and 2.39 times compared to the sludge reduction rate of ozone and homogenizer alone. The present invention is undoubtedly Can improve sludge treatment efficiency.

In summary, the sludge reduction method using a homogenizer and ozone according to the present invention, by performing a sludge reduction treatment step with a homogenizer and ozone, can effectively improve the sludge treatment efficiency. According to the sludge reduction method using the homogenizer and ozone of the present invention, by setting the homogenizer to an appropriate rotation speed, combined with an appropriate amount of ozone and an appropriate reaction treatment time, the sludge treatment efficiency can be optimally improved.

The above description is exemplary only, and not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the attached patent application.

Claims (7)

A method for reducing sludge by using a homogenizer and ozone, including at least the following steps: providing a homogenizer; providing an ozone reactor for generating an ozone; and using the homogenizer and the ozone to simultaneously pollute a sludge The sludge reduction processing step, wherein in the sludge reduction processing step, the rotation speed of the homogenizer is between 5,000 rpm and 9,000 rpm, and the homogenizer is a Shinko Seiki HM-0025 homogenizer. The sludge reduction method using a homogenizer and ozone as described in item 1 of the scope of the patent application, wherein in the sludge reduction treatment step, the amount of ozone is substantially 0.05 g / gMLSS. The sludge reduction method using a homogenizer and ozone as described in item 1 of the scope of the patent application, wherein the treatment time of the sludge reduction treatment step ranges from 15 minutes to 75 minutes. The sludge reduction method using a homogenizer and ozone as described in item 1 of the scope of the patent application, wherein the sludge reduction rate in the sludge reduction treatment step is between 31% and 59%. The sludge reduction method using a homogenizer and ozone as described in item 1 of the scope of patent application, wherein in the sludge reduction treatment step, the speed of the homogenizer is substantially 8,000 rpm, and the amount of ozone is substantially 0.05. g / gMLSS, the treatment time is substantially 60 minutes, and the sludge reduction rate is 57%. The sludge reduction method using a homogenizer and ozone as described in item 1 of the scope of the patent application, wherein the organic content of the sludge is substantially higher than 87%. The sludge reduction method using a homogenizer and ozone as described in item 6 of the scope of patent application, wherein the organic matter content of the sludge is substantially 87.2%, and the pH value is 7.13.