CN201722265U - Leaching device for removing heavy metals from sludge - Google Patents

Abstract

The utility model relates to a leaching device for removing heavy metals from sludge, which comprises a water storage tank and a leaching solution storage tank, and is characterized in that: the water storage tank utilizes a connecting pipe and the input end of the first channel of the first peristaltic pump connected, the eluent storage tank is connected to the input end of the second channel of the first peristaltic pump by a connecting tube; The upper end of the upper leaching column is connected; the lower end of the upper leaching column is connected with the upper end of the lower rinsing column by a connecting pipe; two rubber hose outlets are arranged at the bottom of the lower leaching column, the first rubber hose outlet is connected with the water collection tank, the second The rubber hose outlet is connected with the eluent collection tank. A connecting pipe is used to connect the second peristaltic pump between the eluent collection tank and the upper end of the upper eluent column. A filter membrane is laid on the bottom of the lower washing column. The utility model can thoroughly wash the sludge, can reuse the washing liquid, and can control the poisonous and harmful substances.

Description

Leaching device for removing heavy metals from sludge

technical field

The utility model relates to a washing device for removing heavy metals from sludge, which belongs to the field of repairing heavy metal polluted soil and sludge.

Background technique

Heavy metals are widely used in modern industries, such as electroplating, printing and dyeing, and catalytic industries. However, if it is not properly managed and disposed of, it will cause serious environmental pollution and social nuisance. Heavy metal pollution is universal, irreversible and enriching, known as the contemporary "chemical time bomb". Heavy metals can exist stably in the environment, cannot be decomposed, and are difficult to be reduced. Some can be combined with organic matter to form organic heavy metal compounds, which are absorbed by plants, and some seep into groundwater, and then enter the food chain, enriching at a high multiple in the human body, causing serious harm to the human body.

The leaching method is the most effective treatment method for heavy metal contaminated sludge, and the leaching device is one of the core parts of the leaching method. On the basis that the laboratory has determined the composition, concentration, dosage, solid-liquid ratio, temperature and other process parameters of the eluent, the design of a dynamic elutriation device can lay a solid foundation for the large-scale leaching treatment of sludge rich in heavy metals , so that the sludge can become a new type of sintering material and composting material, which can not only turn waste into treasure, create output value, but also play a positive role in promoting the improvement of the environment.

The dynamic sludge washing device is very different from the ordinary soil washing device. Ensuring its elution efficiency is the main concern. For the elution effect, it is necessary to take regular and quantitative sampling, so as to be able to grasp the influence of time, flow rate, and frequency on the elution amount of heavy metals.

The main body of the traditional sludge washing device is a hollow cylinder, and the lower end is a filter membrane, which is used to prevent the sludge from flowing away with the washing agent. The sludge is injected from the upper port of the column to an appropriate height, the eluent is injected from the upper end of the column, and after flowing through the soil column, the filtrate film at the bottom of the column flows into the liquid storage tank at the lower end, and then the composition of the filtrate is analyzed to detect the leaching. wash effect. However, due to the high content of organic matter in the sludge, the leaching agent is dynamic and directional flow, and the hydrophobic groups on the surface of the sludge will prevent the full contact between water and sludge, and the sludge will form agglomerates due to its surface properties, and the heavy metals contained in it will Difficult to wash out. Before rinsing, let the sludge fully contact with the water phase to change the surface properties of the sludge, which can greatly help to exert the best leaching effect of the eluent.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art and provide a sludge heavy metal removal equipment that can thoroughly rinse the sludge, reuse the rinse solution, and control toxic and harmful substances. Rinsing device.

According to the technical solution provided by the utility model, the leaching device for removing heavy metals from sludge includes a water storage tank and a leaching solution storage tank, and is characterized in that: the water storage tank utilizes the connecting pipe and the first peristaltic pump The input end of a channel is connected, and the eluent storage tank is connected with the input end of the second channel of the first peristaltic pump by a connecting tube; the output ends of the first channel and the second channel of the first peristaltic pump are connected by a connecting tube It is connected with the upper end of the upper leaching pump; the lower end of the upper leaching column is connected with the upper end of the lower rinsing column by a connecting pipe; two rubber hose outlets are provided at the bottom of the lower rinsing column, and the first rubber hose outlet is connected to the water collection The tank is connected, and the outlet of the second hose is connected to the eluent collection tank.

A connecting pipe is used to connect the second peristaltic pump between the eluent collection tank and the upper end of the upper eluent column.

A filter membrane is laid on the bottom of the lower washing column.

An electric stirrer is arranged on the upper end of the upper leaching column, and a stirring paddle is arranged on the electric agitator, and the stirring paddle extends into the upper rinsing column.

Set the second rubber hose clip on the connecting pipe between the first rubber hose outlet at the bottom end of the lower rinse tank and the water collection tank, and set the third rubber hose on the connecting pipe between the second rubber hose outlet and the eluent collection tank folder.

A eluent spray head is installed at the end of the connecting pipe at the output end of the second channel of the first peristaltic pump.

A first rubber hose clip is arranged on the connecting pipe between the upper and lower rinsing columns.

Buckles are arranged outside the outlets of the two hoses at the bottom of the lower washing column.

The utility model aims at the surface properties of the sludge, which can allow the sludge to fully contact with the eluent, and can investigate the changing trend of the effect of multiple leaching, and the sampling and measurement are simple and convenient; The liquid can be reused and the toxic and harmful substances can be controlled.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Figure 2 is a schematic diagram of the structure of the lower eluting column.

Detailed ways

Below in conjunction with specific accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1 to 2: the leaching device includes a water storage tank 1, an eluent storage tank 2, a first peristaltic pump 3, an electric agitator 4, an eluent nozzle 5, a stirring paddle 6, and an upper elution column 7. The first hose clamp 8, the lower leaching column 9, the filter membrane 10, the second hose clamp 11, the water collection tank 12, the third hose clamp 13, the eluent collection tank 14, the second peristaltic pump 15, the buckle 16 etc.

The utility model comprises a water storage tank 1 and a eluent storage tank 2, the water storage tank 1 is connected to the input end of the first channel of the first peristaltic pump 3 by a connecting pipe, and the eluent storage tank 2 is connected by a connecting pipe and The input end of the second channel of the first peristaltic pump 3 is connected; the output end of the first channel of the first peristaltic pump 3 and the output end of the second channel all utilize connecting pipes to be connected with the upper end of the upper rinsing pump 7, at the output end of the second channel The end of the connecting pipe is equipped with a eluent nozzle 5; the lower end of the upper eluting column 7 is connected to the upper end of the lower eluting column 9 by a connecting pipe, and a first rubber hose clip 8 is arranged on the connecting pipe; The bottom end of the column 9 is provided with two rubber hose outlets, and a buckle 16 is arranged outside the two rubber hose outlets, the first rubber hose outlet is connected to the water collection tank 12, and the second rubber hose outlet is connected to the eluent collection tank 14;

A second rubber hose clamp 11 is set on the connecting pipe between the first rubber hose outlet and the water collection tank 12, and a third rubber hose clamp 13 is arranged on the connecting pipe between the second rubber hose outlet and the eluent collection tank 14;

The bottom of described lower leaching column 9 is laid with filter membrane 10; The upper end of described upper leaching column 7 is provided with electric stirrer 4, is provided with stirring paddle 6 on electric stirrer 4, and described stirring paddle 6 extends into the upper eluting column 7;

A second peristaltic pump 15 is connected between the eluent collection tank 14 and the upper end of the upper eluent column 7 by a connecting pipe.

Working process of the present utility model: a certain amount of water and eluent are respectively injected into the water storage tank 1 and the eluent storage tank 2, and the first peristaltic pump 3 can set up corresponding number of channels. One hose leads below the surface of the water and the other leads below the surface of the eluent. The leaching column is divided into upper and lower two. The upper leaching column 7 is used for muddying the sludge, and the lower leaching column 9 is used for rinsing the sludge. The middle is connected by a hose, and a first rubber hose clamp 8 is provided. An electric stirrer 4 is placed outside the upper leaching column 7, connected to a stirring paddle 6 for mixing water and sludge. Two flexible pipes are connected at the bottom of the lower leaching column 9, leading to the water collection tank 12 and the eluent collection tank 14 respectively, and the flexible pipes are clamped with the second hose clamp 11 and the third hose clamp 13.

The composition of the eluent used is 50mmol/L gluconic acid, the eluent is stored in the eluent storage tank 2, the number of channels of the first peristaltic pump 3 is 2, one is used for feeding distilled water, and the other is used for feeding Eluent. The water flow rate is not strictly limited, just moderate, and the water volume is about 10 times of the sludge mass. The eluent flow rate was set at 10 mL/min. A certain amount of sludge is put into the upper leaching column 7, and connected with the outlet of the lower leaching column 9 and the first peristaltic pump 3 by a hose. Open the first channel of the first peristaltic pump 3, pass water into the upper leaching column 7, start the electric agitator 4, and stir the sludge and water by the stirring paddle 6, so that the sludge and water are fully mixed. After the mixing is completed, After the sludge forms mud, open the first rubber hose clamp 8 to make the mud flow into the lower washing column 9 from top to bottom. Loosen the second rubber hose clamp 11, and the free water permeates the filter membrane 10 and enters the water collection tank 12. After all the water permeates through the filter membrane 10, the second rubber hose clamp 11 is clamped. The water collection tank 12 is emptied.

Open the third rubber hose clamp 13, let the eluent flow into the upper eluent column 7 at a certain flow rate, and spray it through the nozzle 5, wash the sludge remaining on the upper eluent column 7 and the stirring paddle 6, and pour it from top to bottom The sludge in the lower washing column 9 passes through the filter membrane 10 and flows into the eluent collection tank 14 through the hose. At the same time, the experimenter took samples to measure the heavy metal content. After washing, clamp the third rubber hose clip 13. A sufficient amount of modified bentonite is added to the eluent collection tank 14 to fully absorb the heavy metal ions in the eluent.

The hose at the input end of the second peristaltic pump 15 is immersed below the liquid level of the eluent collection tank 14, and the eluent is passed into the upper eluent column 7 to perform secondary leaching on the sludge. The eluent passes through the filter membrane 10 and flows into the water collection tank 12 through the hose.

Claims (8)

1. elution device that removes sludge heavy-metal, comprise water storage tank (1) and leacheate storage tank (2), it is characterized in that: described water storage tank (1) utilizes pipe connecting to be connected with the input terminus of the first channel of first peristaltic pump (3), and described leacheate storage tank (2) utilizes pipe connecting to be connected with the input terminus of the second passage of first peristaltic pump (3); The first channel of first peristaltic pump (3) and the output terminal of second passage all utilize pipe connecting to be connected with the upper end of last drip washing pump (7); Described lower end of going up drip washing post (7) utilizes pipe connecting to be connected with the upper end of following drip washing post (9); Be provided with two sebific ducts outlets in the bottom of following drip washing post (9), the outlet of first sebific duct is connected with water collecting tank (12), and the outlet of second sebific duct is connected with leacheate holding tank (14).

2. elution device as claimed in claim 1 is characterized in that: utilize pipe connecting to connect second peristaltic pump (15) between the upper end of described leacheate holding tank (14) and last drip washing post (7).

3. elution device as claimed in claim 1 is characterized in that: be equipped with filter membrane (10) in the described bottom of drip washing post (9) down.

4. elution device as claimed in claim 1 is characterized in that: the upper end of drip washing post (7) is provided with electric mixer (4) on described, is provided with stirring rake (6) on electric mixer (4), and described stirring rake (6) stretches in the drip washing post (7).

5. elution device as claimed in claim 1, it is characterized in that: on the pipe connecting between first sebific duct outlet of described down drip washing jar (9) bottom and the water collecting tank (12), second sebific duct folder (11) is set, on the pipe connecting between outlet of second sebific duct and the leacheate holding tank (14), the 3rd sebific duct is set and presss from both sides (13).

6. elution device as claimed in claim 1 is characterized in that: the end at the pipe connecting of the second passage output terminal of described first peristaltic pump (3) is equipped with leacheate shower nozzle (5).

7. elution device as claimed in claim 1 is characterized in that: first sebific duct folder (8) is set on the pipe connecting on described between drip washing post (7) and the following drip washing post (9).

8. elution device as claimed in claim 1 is characterized in that: outside two sebific duct outlets of described drip washing post (9) bottom down hitch (16) is set.

Images