CN206408005U - Pickling waste waters processing system - Google Patents

Abstract

The utility model discloses a treatment system for pickling wastewater, which comprises a regulating pool and an intermediate pool, and the regulating pool and the intermediate pool are sequentially connected with an oxidation pool, a lifting well, a coagulation reaction pool, an inclined plate sedimentation pool and a pH callback pool, and a waste water reuse device is connected behind the intermediate pool, and the waste water reuse device includes at least one manganese sand filter and a water reuse pool connected in sequence. The wastewater from the workshop flows into the adjustment tank and the oxidation tank in sequence, and then is lifted to the coagulation reaction tank by the pump, and then enters the inclined plate sedimentation tank for mud-water separation. The preliminarily treated waste water flows to the PH callback tank, where the PH is adjusted back to 6-9, and then enters the reuse water tank. Part of the water is discharged up to the standard, and the other part of the water is lifted to the manganese sand filter by the booster pump to remove suspended solids in the water. The final treated wastewater flows to the reuse pool and then used by the workshop, which can greatly save water resources and save business costs.

Description

Pickling wastewater treatment system

technical field

The utility model relates to the technical field of waste water treatment, in particular to a pickling waste water treatment system.

Background technique

The pickling process in my country's iron and steel industry and metal products industry needs to remove the oxide scale on the steel surface for pickling treatment. During the pickling process, a large amount of waste acid will be produced. The main components of sulfuric acid pickling waste are: free acid Impurities such as ferrous sulfate, water and suspended solids generally form waste acid when the concentration of ferrous sulfate in the waste acid is greater than 250g/L when the concentration is less than 4%. For waste acid that cannot be used, the national environmental protection department has strict management, and direct discharge is not allowed. The discharge of this kind of waste liquid in our country is astonishing. Generally, about 200kg of pickling waste liquid can be produced per ton of steel produced. At present, the iron and steel industry has become a major user of water consumption and a major producer of waste liquid. Iron and steel enterprises discharge a lot of waste water containing waste acid every year, causing environmental pollution and a serious waste of water resources.

Utility model content

The purpose of the utility model is to provide an efficient and environment-friendly pickling wastewater treatment system.

The above-mentioned technical purpose of the utility model is achieved through the following technical solutions:

A pickling wastewater treatment system, comprising a regulating pond and an intermediate pond, an oxidation pond, a lifting well, a coagulation reaction pond, an inclined plate sedimentation pond and a pH callback pond are sequentially connected between the regulating pond and the intermediate pond, and the intermediate A waste water reuse device is also connected behind the pool, and the waste water reuse device includes at least one manganese sand filter and a reuse water pool connected in sequence.

By adopting the above scheme, the wastewater from the workshop flows into the adjustment tank by itself, and then enters the oxidation tank, where the ferrous ions in the water are oxidized into ferric ions by aeration in the oxidation tank, and then enters the lifting well, and is lifted to the coagulation reaction tank by the pump. Add NaOH to the coagulation reaction tank to adjust the pH value of the water, remove ferric ions in the water, and then add flocculants and coagulants to flocculate the fine ferric hydroxide suspensions in the water and form large particle suspensions and then enter the inclined plate sedimentation tank for mud-water separation. The preliminarily treated waste water flows to the PH callback pool, where the PH is adjusted back to 6-9, and then enters the reuse water pool. Part of the water is discharged up to the standard, and part of the water is lifted to the manganese sand filter by the booster pump to remove suspended solids in the water. The final treated wastewater flows to the reuse pool and then used by the workshop, which can greatly save water resources and save business costs.

As an improvement of the utility model, the inclined plate settling tank is connected with a sludge thickening tank and a plate-and-frame filter press in sequence.

By adopting the above scheme, the sludge separated in the inclined plate sedimentation tank is discharged to the sludge thickening tank for preliminary concentration, and then the wet sludge is dehydrated by the pump to the plate and frame filter press, which can facilitate the transportation of dewatered sludge Proceed to the next step.

As an improvement of the utility model, a first return pipe and a second return pipe are connected between the reuse water pool and the intermediate pool and the manganese sand filter respectively.

By adopting the above solution, the reused water pool can discharge excess treated waste water to the intermediate pool through the first return pipe, and then discharge it to the outside from the intermediate pool. Through the second return pipe in the reuse pool, the incompletely filtered waste water in the reuse pool can be re-discharged to the manganese sand filter for re-filtering, so that the waste water can meet the reuse standard.

As an improvement of the utility model, a first pipeline is communicated between the plate and frame filter press and the lifting shaft.

By adopting the above solution, the plate and frame filter press can redischarge the squeezed filtrate from the wet sludge to the lift shaft through the first pipeline, so that the untreated filtrate can be re-treated in the coagulation reaction tank.

As an improvement of the present utility model, a first pH online display device and a second pH online display device are respectively connected to the coagulation reaction tank and the pH callback tank.

By adopting the above scheme, the first PH online display and the second PH online display are respectively connected in the coagulation reaction tank and the PH callback tank, and it can be learned from the implementation of the first PH online display and the second PH online display The PH value of the wastewater can be adjusted in time to the amount of dosing in the coagulation reaction tank and the PH callback tank to ensure that the PH value of the wastewater meets the discharge requirements.

As an improvement of the utility model, the mixing reaction pool includes a neutralization pool, a PAC pool and a PAM pool connected in sequence, the neutralization pool is connected with a NaOH drug dissolving tank, and the PAC pool is connected with a PAC drug dissolving tank , the PAM pool is connected with a PAM drug-dissolving tank, the first pH online display device is set in the neutralization pool, and the pH callback pool is connected with a hydrochloric acid drug-dissolving tank.

By adopting the above scheme, the NaOH dissolved in the neutralization pool can neutralize the acid in the waste water and remove the ferric ions in the water, and then through the action of the PAC dissolved in the PAC pool and the PAM dissolved in the PAM pool , It can flocculate the fine ferric hydroxide suspension in the water and form a large particle suspension, which is convenient for the subsequent separation of the large particle suspension from mud and water. The wastewater after mud-water separation flows into the PH callback tank and reacts with hydrochloric acid to neutralize the excess NaOH dissolved before passing through to ensure that the pH value of the wastewater meets the discharge requirements.

As an improvement of the present utility model, the inclined plate sedimentation tank includes a tank body, the upper end of the tank body is provided with a water inlet and a water outlet, and a baffle is provided behind the water inlet, and the baffle is connected to the tank body. There is a gap between the bottom of the tank, at least one sloping plate filler is provided horizontally in the direction of the baffle away from the water inlet, a number of sludge hoppers are provided at the bottom of the pool body, and sewage pipes are opened at the bottom of the sludge hopper. A second pipeline is connected between the sewage pipe and the sludge thickening tank.

By adopting the above scheme, the waste water entering the tank body of the inclined plate sedimentation tank from the water inlet will first hit the baffle plate, thereby slowing down the flow rate of the waste water, and then slowly flow through the gap between the baffle plate and the bottom of the tank body, and then Enter the sloping plate packing for mud-water separation. The separated sludge will accumulate at the bottom of the sludge hopper due to its own gravity. Finally, the sewage pipe opened at the bottom of the sludge hopper can be opened to directly discharge the sludge to the sludge thickening tank, thereby reducing The total iron concentration in wastewater can achieve the purpose of wastewater treatment.

In summary, the utility model has the following beneficial effects:

1. Add a wastewater reuse device after wastewater treatment. The wastewater reuse device includes at least one manganese sand filter and a reuse pool connected in sequence. The wastewater can remove suspended solids in the water through the manganese sand filter, and the finally treated wastewater flows To reuse the water pool and then use it in the workshop, which can greatly save water resources and save enterprise costs;

2. A first return pipe and a second return pipe are respectively connected between the reuse water pool and the intermediate pool and the manganese sand filter. The recycled water pool can discharge excess treated waste water to the intermediate pool through the first return pipe, and then discharge it to the outside from the intermediate pool. In the reuse pool, through the second return pipe, the incompletely filtered wastewater in the reuse pool can be re-discharged to the manganese sand filter for re-filtering, so that the wastewater can meet the reuse standard;

3. Discharge the sludge separated from the inclined plate sedimentation tank to the sludge thickening tank for preliminary concentration, and then take it to the plate and frame filter press through the pump to dehydrate the wet sludge, which can facilitate the transportation of the dewatered sludge to the next step Processing; a first pipeline is communicated between the plate-and-frame filter press and the lifting shaft, and the plate-and-frame filter press can discharge the squeezed filtrate from the wet sludge to the lifting well through the first pipeline, so that no The completely treated filtrate is re-treated in the coagulation reaction tank;

4. The first PH online display and the second PH online display are respectively connected to the coagulation reaction tank and the PH callback tank, and the pH of the wastewater can be obtained from the first PH online display and the second PH online display. Value, so that the amount of medicine added to the coagulation reaction tank and pH callback tank can be adjusted in time to ensure that the pH value of the wastewater meets the discharge requirements.

Description of drawings

Fig. 1 is the flowchart of pickling wastewater treatment system;

Figure 2 is a schematic diagram of the structure of the inclined plate sedimentation tank.

In the figure, 1. The first return pipe; 2. The second return pipe; 3. The first pipeline; 4. The second pipeline; 5. The first PH online display device; 6. The second PH online display device; 7. Pool body; 701, water inlet; 702, water outlet; 8, baffle plate; 9, inclined plate packing; 10, sludge bucket; 1001, sewage pipe; PH callback pool.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Example:

Referring to Fig. 1, a pickling wastewater treatment system includes a regulating tank, an oxidation tank, a lifting well, a coagulation reaction tank 11A, an inclined plate sedimentation tank 11B, a pH callback tank 11C and an intermediate pool connected in sequence. The coagulation reaction pool 11A includes a neutralization pool, a PAC pool, and a PAM pool connected in sequence. The neutralization pool is connected to a NaOH drug-dissolving tank through a dosing pump, the PAC pool is connected to a PAC drug-dissolving tank through a dosing pump, and the PAM pool is connected to a PAC drug-dissolving tank through a dosing pump. The drug pump is connected with a PAM drug dissolving tank, and the pH callback pool 11C is connected with a hydrochloric acid drug dissolving tank through the drug dosing pump.

The intermediate pool is also connected with a waste water reuse device, which includes two manganese sand filters and a reuse water pool connected in sequence, and the first return pipe 1 is connected between the reuse water pool and the middle pool and the manganese sand filter respectively and the second return pipe 2.

1 and 2, the coagulation reaction tank 11A and the pH callback tank 11C are respectively provided with a first PH online display instrument 5 and a second PH online display instrument 6, and the first PH online display instrument 5 is located in the and pool.

The inclined plate sedimentation tank 11B includes a pool body 7, the upper end of the pool body 7 is provided with a water inlet 701 and a water outlet 702, and a baffle plate 8 is provided behind the water inlet 701, and a gap is left between the baffle plate 8 and the bottom of the pool body 7. In the gap, the baffle plate 8 deviates from the direction of the water inlet 701, and a sloping plate filler 9 is arranged horizontally. There are four sludge hoppers 10 at the bottom of the pool body 7, and a sewage discharge pipe 1001 is opened at the bottom of the sludge hopper 10. The sewage discharge pipe 1001 passes through the first The second pipeline 4 communicates with the sludge thickening tank. The sludge thickening tank is connected to the plate and frame filter press through a sludge diaphragm pump, and a first pipeline 3 is also connected between the plate and frame filter press and the lifting shaft.

In the specific treatment of wastewater, the workshop wastewater enters the adjustment tank by itself, and then enters the oxidation tank. The ferrous ions in the water are oxidized into ferric ions by aeration in the oxidation tank, and then enter the lifting well, and are lifted to the coagulation reaction tank by the pump. 11A, add NaOH in the coagulation reaction tank, adjust the pH value in the water, remove the ferric ions in the water, and then add flocculant and coagulant to flocculate the fine ferric hydroxide suspension in the water and Large particle suspensions are formed, and then enter the inclined plate sedimentation tank 11B for mud-water separation. The preliminarily treated wastewater flows to the PH callback pool 11C, where the pH is adjusted to 6-9, and then enters the reuse pool, part of the water is discharged up to the standard, and part of the water is lifted to the manganese sand filter by the booster pump to remove suspended solids in the water. The final treated wastewater flows to the reuse tank and then used by the workshop. Discharge the sludge separated in the inclined plate sedimentation tank 11B to the sludge thickening tank for preliminary concentration, and then take it to the plate and frame filter press through the sludge diaphragm pump to dehydrate the wet sludge, which can facilitate the transportation of dewatered sludge Proceed to the next step.

This specific embodiment is only an explanation of the utility model, and it is not a limitation of the utility model. After reading this description, those skilled in the art can make modifications to the embodiment without creative contribution according to needs, but as long as it is within the utility model All new claims are protected by patent law.

Claims (7)

1. a kind of pickling of metal Waste Water Treatment, including regulating reservoir and intermediate pool, it is characterised in that the regulating reservoir is with Between be connected with oxidation pond, winding shaft, coagulation reaction tank in turn between pond（11A）, inclined-plate clarifying basin（11B）Pond is adjusted back with PH （11C）, wastewater recycling device is also associated with after the intermediate pool, wastewater recycling device includes at least one manganese being sequentially connected Sand filter and reuse pool.

2. pickling of metal Waste Water Treatment according to claim 1, the inclined-plate clarifying basin（11B）Also it is connected with turn Sludge concentration tank and plate and frame filter press.

3. pickling of metal Waste Water Treatment according to claim 1, the reuse pool respectively with intermediate pool and manganese The first return duct is communicated between sand filter（1）With the second return duct（2）.

4. pickling of metal Waste Water Treatment according to claim 2, between the plate and frame filter press and the winding shaft It is communicated with the first pipeline（3）.

5. pickling of metal Waste Water Treatment according to claim 1, the coagulation reaction tank（11A）With PH readjustments Pond（11C）Inside it is connected to the first PH Real time displaying instrument（5）With the 2nd PH Real time displaying instrument（6）.

6. pickling of metal Waste Water Treatment according to claim 5, the coagulation reaction tank（11A）Including being sequentially communicated Neutralization pond, PAC ponds and PAM ponds, the neutralization pond is communicated with the molten drug slots of NaOH, and the PAC ponds are communicated with the molten drug slots of PAC, institute State PAM ponds and be communicated with the molten drug slots of PAM, the first PH Real time displaying instrument（5）In the neutralization pond, the PH adjusts back pond （11C）It is communicated with the molten drug slot of hydrochloric acid.

7. pickling of metal Waste Water Treatment according to claim 1, the inclined-plate clarifying basin（11B）Including pond body（7）, Pond body（7）Upper end offer water inlet（701）And delivery port（702）, the water inlet（701）A baffle plate is provided with afterwards（8）, institute State baffle plate（8）With the pond body（7）Bottom between leave space, the baffle plate（8）Away from water inlet（701）Direction level Provided with least one inclined plate packing（9）, the pond body（7）Bottom is provided with some sludge buckets（10）, the sludge bucket（10）Bottom Portion offers blow-off pipe（1001）, the blow-off pipe（1001）Second pipe is communicated between the sludge concentration tank（4）.