CN111592201A - A kind of electrochemical decomposing method of sludge solid waste - Google Patents

Abstract

The invention belongs to the technical field of sludge solid waste environment-friendly treatment, and discloses a sludge solid waste electrochemical decomposition method, which comprises the steps of sending sludge solid waste into a crusher to be treated to obtain crushed sludge solid waste; filling the crushed sludge solid waste into a sludge pit or naturally stacking; sequentially inserting a plurality of anode electrode plates and cathode electrode plates into the sludge solid waste according to the sequence of the anode plates and the cathode plates, and electrifying for a period of time at a certain voltage; and stopping electrifying, taking out the electrode plate, turning over the stack, ventilating, decomposing, airing the storage area to be in a dry soil state, and granulating to obtain the land utilization product. The invention not only enables the sludge solid waste to be treated with high efficiency and harmlessness, but also has artificially controllable rotting and curing conditions, simple treatment facilities, partial heavy metals removal, virus killing and fire extinguishing, effectively improves the efficiency of converting the sludge solid waste into land utilization products, and reduces the secondary environmental pollution caused by other traditional methods to sludge treatment.

Description

A kind of electrochemical decomposing method of sludge solid waste

technical field

The invention belongs to the technical field of sludge environmental protection treatment, and in particular relates to an electrochemical decomposing method for sludge solid waste.

Background technique

Sludge solid waste with a moisture content of 60-80% (sewage plant sludge, anaerobic digested biogas residue, agricultural river sludge, etc.) is often used for land use by the decomposing process. Traditional composting and aerobic fermentation to achieve weight reduction and stabilization requires a long time, high cost of adding auxiliary materials, inability to remove heavy metals, poor fertilizer efficiency, and poor pathogen disinfecting effect.

Through the above analysis, the existing problems and defects in the prior art are: (1) In the prior art, the processing time of the rotting process is too long.

(2) In the prior art, the cost of the added auxiliary materials is too high.

(3) In the prior art, heavy metals cannot be removed.

(4) In the prior art, the fertilizer effect of the obtained land utilization product is not good.

(5) In the prior art, the pathogen elimination effect is not good.

The difficulty of solving the above problems and defects is as follows:

(1) How to reduce the processing time of the rotting process through this technology.

(2) How to add less or even no auxiliary materials through this technology.

(3) How to remove heavy metals by this technology.

(4) How to enhance the fertilizer efficiency of land use products through this technology.

(5) How to disinfect pathogens by this technology.

The significance of solving the above problems and defects is as follows: (1) By reducing the processing time of the rotting process by this technology, the floor space of the processing workshop of the rotting process can be reduced, thereby reducing the cost of land occupation.

(2) By adding less or even no auxiliary materials by this technology, the material cost added in the rotting and aging process can be reduced.

(3) Removing heavy metals by this technology can reduce the potential harm caused by heavy metals to the environment.

(4) The fertilizer efficiency of land use products can be enhanced by this technology, and the potential harm caused by heavy metals to the environment can be reduced.

(5) By eliminating pathogens by this technology, the potential harm caused by pathogens to the environment can be reduced.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention provides a method for electrochemically decomposing sludge solid waste. The electrochemical decomposing technology provided by the present invention can utilize the moisture in the sludge to generate hydroxyl radicals under the catalysis of electrode plates and voltage, and then oxidize and decompose the refractory organic substances, making them into small molecular organic substances that are easy for plants to absorb. Due to the electromigration of water molecules and heavy metals, the sludge solid waste can be dehydrated and heavy metals can be removed. Pathogens can also be disinfected due to the high temperature and strongly oxidizing hydroxyl radicals generated by the electrochemical process. The land use product produced by the method has better nutritional value than the biological compost product, and has the advantages of short time consumption, less odor, easy control of reaction conditions, stable treatment effect, etc. Improved way.

The present invention is achieved in this way, a method for electrochemically decomposing sludge solid waste, comprising the following steps:

Step 1, sending the sludge solid waste into a crusher for processing to obtain the crushed sludge solid waste;

Step 2: Load the crushed sludge solid waste into a sludge pit or stack it naturally;

Step 3: Insert several anode and cathode electrode plates into the sludge in sequence according to the order of anode plate and cathode plate, and energize at a certain voltage for a period of time;

Step 4. Stop the power supply, take out the electrode plate, and then turn the stack for ventilation-decompose for 24-48 hours, air-dry the storage area to dry mud, and granulate it into a land-use product.

Further, in the first step, the crushing ratio of the crusher is 3-10.

Further, in the second step, the depth of the sludge pit or natural heap is 1-1.5m.

Further, in the third step, the anode plate used is a titanium-based iridium dioxide coated electrode, the cathode plate is a titanium electrode plate, the distance between the plates is 5-15cm, the voltage is 50-200V, and the time is 30-60min.

Combined with all the above technical solutions, the advantages and positive effects of the present invention are as follows: (1) The present invention reduces the processing time of the rotting process. (2) This technology does not need to add auxiliary materials. (3) This technology can remove some heavy metals. (4) The technology enhances the fertilizer efficiency of land use products. (5) This technology can eliminate pathogens.

In the invention, the crushed sludge solid waste is obtained by sending the sludge solid waste into a crusher for processing; the crushed sludge solid waste is put into a sludge pit or stacked naturally; The plate is inserted into the sludge solid waste in the order of anode plate and cathode plate, and energized at a certain voltage for a period of time; stop the energization, take out the electrode plate, and then turn the stack to ventilate - decompose for 24-48 hours, and air dry in the storage area. To dry clay, granulated to become land use products. The invention not only enables efficient and harmless treatment of sludge solid waste, but also artificially controllable decomposing conditions, simple treatment facilities, and removes some heavy metals, eliminates viruses, and effectively improves the conversion of sludge solid waste. For the efficiency of land use products, it reduces the secondary pollution of the environment caused by other traditional methods of sludge treatment.

Compare technical or experimental effects. (1) Compared with the original technology, the present invention reduces the processing time of the rotting process. (2) Compared with the original technology, the present invention does not need to add any auxiliary materials. (3) Compared with the original technology, the present invention can remove part of heavy metals. (4) Compared with the original technology, the present invention enhances the fertilizer efficiency of land utilization products. (5) Compared with the original technology, the present invention can eliminate pathogens.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings that need to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a flow chart of a method for electrochemically decomposing and curing sludge solid waste according to an embodiment of the present invention.

FIG. 2 is a graph showing the results of an experiment of ryegrass seed sowing after the sludge provided by the embodiment of the present invention is treated by the present technology.

FIG. 3 is a diagram of the dehydration situation obtained after the sludge provided by the embodiment of the present invention is processed by the present technology.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In view of the problems existing in the prior art, the present invention provides a method for electrochemically decomposing sludge solid waste. The present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1, a method for electrochemically decomposing sludge solid waste according to the present invention comprises the following steps:

S101 , sending the sludge solid waste into a crusher for processing to obtain the crushed sludge solid waste.

S102. Load the crushed sludge solid waste into a sludge pit or stack it naturally.

S103, insert several anode and cathode electrode plates into the sludge in sequence according to the order of anode plate and cathode plate, and energize for a period of time at a certain voltage.

S104, stop the power supply, take out the electrode plate, then turn the stack for ventilation-decompose for 24-48 hours, air-dry the storage area to dry mud, and granulate it into a land-use product.

This method adopts the electrochemical decomposing method. The electrode plate is placed on the sludge with the initial 60-80% moisture content, and the electricity is started at room temperature, and the electric field strength is 5-30V/cm, so that the sludge is dehydrated, heated, and the filtrate is brought Remove heavy metals for 30-60 minutes until the temperature rises to 60-75°C, and the moisture content drops below 60%, then turn over the stack for ventilation - decompose for 24-48 hours, air dry in the storage area to dry mud, and granulate to become land use product.

The present invention will be further described below in conjunction with specific embodiments.

Example 1

The present invention proposes a method for electrochemical degradation of sludge solid waste, which is characterized in that the steps are:

(1), the sludge is sent to the crusher for processing to obtain the crushed sludge, and the crushing ratio of the crusher is 5.

(2) The crushed sludge is piled up naturally, and the depth of the pile is 1m.

(3) Insert several anode and cathode electrode plates vertically into the sludge in the order of anode plate and cathode plate with a plate spacing of 5cm, and energize it at a voltage of 50V for 60min, at about 70°C, the virus will be killed. 72% of heavy metals are removed, the anode plate used is a titanium-based iridium dioxide coated electrode, and the cathode plate is a titanium electrode plate.

(4) Stop the power supply, take out the electrode plate, and then turn the stack to ventilate - decompose for 30 hours, air-dry the storage area to dry mud, and granulate to become a land use product. The fertilizer efficiency is NPK>3%.

Example 2

The present invention proposes a method for electrochemical degradation of sludge solid waste, which is characterized in that the steps are:

(1) The sludge is sent to the crusher for processing to obtain the crushed sludge, and the crushing ratio of the crusher is 10.

(2) Put the crushed sludge into a container with a specific shape, and the depth of the container is 1.5m.

(3) Insert several anode and cathode electrode plates vertically into the sludge in the order of anode plate and cathode plate with a plate spacing of 10cm, and energize at a voltage of 100V for 60min, at about 70℃, the virus will be killed. 72% of heavy metals are removed, the anode plate used is a titanium-based iridium dioxide coated electrode, and the cathode plate is a titanium electrode plate.

(4) Stop the power supply, take out the electrode plate, and then turn the stack to ventilate - decompose for 40 hours, air-dry the storage area to dry mud, and granulate it into a land-use product with a fertilizer efficiency of NPK>3%.

Example 3

The present invention proposes a method for electrochemical degradation of sludge solid waste, which is characterized in that the steps are:

(1) The sludge is sent to the crusher for processing to obtain the crushed sludge, and the crushing ratio of the crusher is 8.

(2) The crushed sludge is piled up naturally, and the depth of the pile is 1.5m.

(3) Insert several anode and cathode electrode plates vertically into the sludge in the order of anode plate and cathode plate with a plate spacing of 15cm, energize at 150V for 45min, and kill the virus at about 70°C. 72% of heavy metals are removed, the anode plate used is a titanium-based iridium dioxide coated electrode, and the cathode plate is a titanium electrode plate.

(4) Stop the power supply, take out the electrode plate, and then turn the stack to ventilate - decompose for 30 hours, air-dry the storage area to dry mud, and granulate to become a land use product. The fertilizer efficiency is NPK>3%.

The present invention will be further described below in conjunction with specific experiments and effects.

The experimental results of ryegrass seed sowing after the sludge is treated by this technology are shown in Figure 2.

After the sludge is treated by this technology, the dewatering situation obtained is shown in Figure 3.

In the description of the present invention, unless otherwise stated, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer" The orientation or positional relationship indicated by , "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, not An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art is within the technical scope disclosed by the present invention, and all within the spirit and principle of the present invention Any modifications, equivalent replacements and improvements made within the scope of the present invention should be included within the protection scope of the present invention.

Claims (4)

1. A sludge solid waste electrochemical decomposing method, characterized in that the sludge solid waste electrochemical decomposing method comprises the following steps: Step 1, sending the sludge solid waste into a crusher for processing to obtain the crushed sludge solid waste; Step 2: Load the crushed sludge solid waste into a sludge pit or stack it naturally; Step 3: Insert several anode and cathode electrode plates into the sludge in sequence according to the order of anode plate and cathode plate, and energize at a certain voltage for a period of time; Step 4. Stop the power supply, take out the electrode plate, and then turn the stack for ventilation-decompose for 24-48 hours, air-dry the storage area to dry mud, and granulate it into a land-use product. 2 . The electrochemical decomposing method for sludge solid waste according to claim 1 , wherein, in the first step, the crushing ratio of the crusher is 3-10. 3 . 3 . The electrochemical decomposing method for sludge solid waste according to claim 1 , wherein, in the second step, the depth of the sludge pit or the natural pile is 1-1.5 m. 4 . 4. The method for electrochemical degradation of sludge solid waste as claimed in claim 1, wherein in the step 3, the anode plate used is a titanium-based iridium dioxide coated electrode, and the cathode plate is a titanium electrode plate, the distance between the plates is 5-15cm, the voltage is 50-200V, and the time is 30-60min.

Images