CN202849189U - Device for removing lead in industrial waste water by utilizing tea leaves - Google Patents

Abstract

The utility model provides a device for removing lead from industrial waste water by using tea dregs, that is, after passing through the thick and thin grids in the first step of the waste water treatment procedure, a rotary filter fine screen device equipped with tea dregs is added thereafter, and the filter is rotated and filtered. The fine screen is composed of a circular frame and a rotating device. The diameter of the screen mesh is 0.2~0.5mm. The screen is a sealing device with an opening that can be opened for changing and washing the tea dregs inside. The device effectively utilizes low-cost organisms to adsorb heavy metals in acidic industrial wastewater, has a simple structure, and these tea dregs are environmentally friendly and easy to recycle.

Description

A device for removing lead from industrial wastewater using tea dregs

technical field

It has a good adsorption effect on lead ions and heavy metals in acidic industrial wastewater, and is suitable for the absorption of acidic industrial wastewater containing a large amount of lead ions. the

technical background

Metal lead is used in electroplating, metal processing, ore processing, battery manufacturing, petroleum refining and other industries. While lead is widely used, it also pollutes the environment to varying degrees. Lead and its compounds enter the human body and can accumulate in the liver and kidneys, resulting in hemoglobin synthesis being blocked and anemia occurring, thus having adverse effects on human health. Traditional lead-containing wastewater treatment technologies include chemical precipitation, electrolysis, adsorption, and ion exchange. The chemical precipitation method consumes a lot of energy for chemical reagents, and there is a possibility of secondary pollution; the electrolysis method consumes a lot of electricity and treats a small amount of wastewater. If biosorption is used in the early stage of wastewater treatment, it can greatly reduce the amount of metal lead. Content, in the following chemical precipitation or electrolysis method can reduce the speculation of chemical agents, and also can not consume a lot of electric energy. the

The carboxyl groups and amino groups contained in the chemical structure of bioabsorbent materials can become the adsorption sites of heavy metals. The use of tea dregs to adsorb lead ions is because tea dregs has not only ion exchange chemical adsorption for lead ions, but also because tea has a reticular porous structure, lead ions have physical adsorption with the cell wall on the surface of tea leaves. However, the dosage of tea dregs, pH value and temperature will all affect the adsorption effect of tea dregs on lead ions in water, and the tea polyphenols in tea can also be removed by adding flocculant PAC later, but the reaction between tea polyphenols and metal ions is limited. Reversibility, the precipitate produced by pretreatment can free tea polyphenols through acid treatment, and the economic value of tea polyphenols is very high, so it is recommended to consider the recycling of tea polyphenols in actual projects, which can Reduce the cost of sewage treatment. the

Utility model content

The utility model is a device for removing lead from industrial waste water by using tea dregs. After passing through the thick and thin grids in the first step of the wastewater treatment procedure, a rotating fine screen filtering device equipped with tea dregs is added thereafter, and the rotating fine screen It is composed of a circular frame and a rotating device. The mesh diameter of the screen is 0.2~0.5mm. The screen is a sealing device with an opening that can be opened for changing and washing the tea dregs inside. the

The original rotating screen is modified, and the original empty shell can be improved to be airtight, and tea residue can be placed in it, so that when the water flows through the inlet and slowly flows into the rotating bucket, most of the lead in the industrial wastewater will be absorbed by the tea. The slag is adsorbed, and the filtered water can be discharged through the lower screen of the drum and enter the next procedure. Fine suspended matter such as fibers and pulp in the water will be intercepted, and the heavy metal lead in the water can also be absorbed by the tea residue. When the tea residue is replaced after a certain period of time, the used tea residue can be washed and dried for reuse. If biosorption is used in the early stage of wastewater treatment, the content of metal lead can be greatly reduced, and in the subsequent chemical precipitation or electrolysis method, it can reduce the speculation of chemical agents, and it can also avoid consuming a lot of electricity. the

Description of drawings

Fig. 1 is the flowchart of industrial wastewater treatment;

In the figure: 1-raw wastewater; 2-coarse and fine grille; 3-tea dregs screen filter; 4-grit chamber; 5-primary sedimentation tank; 6-aeration tank; 7-air; 8-secondary sedimentation tank ;9- Cl ₂ or other disinfectants; 10-contact pool; 11-outlet water; 12-sludge return; 13-sludge return pump room; 14-silt collection well; 15-flocculant; ;17-first-level digester; 18-secondary digester; 19-sludge dewatering machine room; 20-mud cake transport; 21-supernatant backflow

Figure 2 Schematic diagram of centrifugal screen integrated filtration system

In the figure: 22-bracket; 23-flush valve; 24-centrifugal filter tank; 25-water inlet; 26-top cover; 27-exhaust valve; ; 30-sewage chamber; 31-sewage outlet

Detailed ways

Firstly, the tea dregs should be recovered and pretreated;

Then the amount of tea dregs to be added should be determined according to the lead content in the waste water;

It is necessary to properly adjust the temperature and pH of the wastewater to maximize the absorption of lead by the tea residue;

A certain amount of tea dregs is loaded, so that the filtered water of the waste water can be discharged through the screen at the lower part of the drum and enter the next procedure. Fine suspended matter such as fiber and pulp in the water will be intercepted, and the heavy metal lead in the water can also be absorbed by the tea dregs. the

The waste tea dregs should be replaced regularly to recover the heavy metals and tea polyphenols, and the tea dregs can be reused after being washed and dried. the

This device can only remove part of the lead ions, but reduces the workload of subsequent operations, and the tea residue is non-toxic and harmless, environmentally friendly and easy to obtain. the

Claims (1)

1. A device for removing lead from industrial wastewater using tea dregs, which is to pass through the thick and thin grids in the first step of the wastewater treatment process, and then add a rotating and filtering fine screen device equipped with tea dregs, and then rotate and filter the fine sieve The net is composed of a circular frame and a rotating device. The diameter of the screen mesh is 0.2~0.5mm. The screen mesh is a sealing device with an opening that can be opened for changing and washing the tea dregs inside. the