CN107487904A - A kind of iron content waste water pretreatment unit - Google Patents

Abstract

The invention relates to a pretreatment device for iron-containing wastewater, comprising a regulating tank, a reducing reaction tank, a crystallization sedimentation tank, a quicksand filter and a water storage tank, and the regulating tank, the reduction reaction tank, the crystallization sedimentation tank, the quicksand filter and the water storage tank are connected in sequence The adjustment tank includes the water inlet pipe of the adjustment tank and the water outlet pipe of the adjustment tank; the upper middle part of the reduction reaction tank is provided with the water inlet pipe of the reduction reaction tank, the upper part is provided with a reducing agent addition metering system, the middle part is provided with a reduction reaction tank agitator, and the bottom is provided with a reduction reaction tank The outlet pipe of the reaction tank; the crystallization sedimentation tank includes an overflow weir connected to the outlet pipe of the crystallization sedimentation tank and an outlet pipe connected to the inlet pipe of the quicksand filter; the quicksand filter is provided with a quicksand filter inlet pipe and a quicksand filter for discharging treated water The water outlet pipe includes the water distribution area, the sand washing area and the sand filter area; the water filtered by the quicksand filter enters the water storage tank.

Description

A pretreatment device for iron-containing wastewater

technical field

The invention relates to the technical field of environmental protection, in particular to an iron-containing wastewater pretreatment device.

Background technique

In my country's current "Industrial "Three Wastes" Discharge Trial Standards", there is no restriction on the content of iron. However, if the iron-containing wastewater is discharged directly, the dissolved iron ions in the wastewater will cause the dissolved oxygen in the water to decrease rapidly, and the drainage will be reddish orange and turbid. Once it enters the ecological cycle, it will cause great harm to ecological security and human health.

In actual engineering, the iron-containing heavy metal wastewater mainly comes from precious metal processing and production drainage, mainly including mine drainage, steel production and processing effluent, some metal etching processing and electroplating production process effluent, etc. Different links in these processing and production processes will produce a large number of High concentrations of iron in different forms belong to a class of wastewater that is difficult to treat.

Chinese patent "A treatment device and method for pickling iron-containing wastewater" (patent number: 201410288531.5) discloses a treatment device and method for pickling iron-containing wastewater, which can treat iron-containing wastewater. In this invention, through oil separation, neutralization and aeration, fine adjustment of pH, primary precipitation and secondary precipitation, block limestone is sent into the neutralization and aeration reaction tank in batches during neutralization and aeration. The device is simple and easy , less sediment, etc.; but this patent has the following disadvantages: massive limestone is sent into the neutralization aeration reaction tank in batches, which increases the treatment cost and operating cost, and increases the burden on the enterprise.

Contents of the invention

The technical problem to be solved by the present invention is: in order to solve the above-mentioned iron-containing wastewater treatment problem, the present invention provides an iron-containing wastewater pretreatment device.

The technical scheme adopted by the present invention to solve the technical problem is: a kind of iron-containing wastewater pretreatment device, including adjustment tank, reduction reaction tank, crystallization sedimentation tank, quicksand filter tank and water storage tank, adjustment tank, reduction reaction tank, crystallization sedimentation tank The pool, the quicksand filter and the storage tank are connected in sequence.

The regulating pond includes a regulating pond inlet pipe and a regulating pond outlet pipe for regulating the water quality and quantity of the waste water.

The middle and upper part of the reduction reaction tank is provided with a reduction reaction tank water inlet pipe, and the upper part of the reduction reaction tank is provided with a reducing agent addition metering system; the middle part of the reduction reaction tank is provided with a reduction reaction tank agitator, and the bottom of the reduction reaction tank is provided with a Restore the outlet pipe of the reaction pool.

The reducing agent added by the reducing agent adding metering system is sodium bisulfite.

The crystallization sedimentation tank includes a crystallization area and a precipitation area.

The upper middle part of the crystallization area is provided with a water inlet pipe for a crystallization sedimentation tank, the upper part of the crystallization area is provided with a crystallization inducer adding metering system; the middle and lower part of the crystallization area is provided with a crystallization area stirrer.

The crystallization inducer added by the added metering system of the crystallization inducer is quartz sand coated with sodium carbonate; the preparation process of the crystallization inducer is:

① Soak the quartz sand in 1mol/L sodium carbonate solution and shake it in a shaker for 24 hours;

② Filter the soaked quartz sand;

③ Wash the filtered quartz sand with deionized water;

④ drying the cleaned quartz to obtain a crystallization inducer.

There is a partition between the crystallization area and the sedimentation area, and the partition and the inner wall of the crystallization sedimentation tank form a waste water flow channel that enters the sedimentation area as wastewater. The upper part of the outlet is equipped with a crystallization sedimentation tank overflow weir, the bottom of the sedimentation area is designed as a conical structure, and a sediment discharge valve is set at the bottom of the conical structure. The overflow weir of the crystallization sedimentation tank is connected to the outlet pipe of the crystallization sedimentation tank, and the outlet pipe of the crystallization sedimentation tank is connected to the water inlet pipe of the quicksand filter.

The quicksand filter includes a quicksand filter inlet pipe and a quicksand filter outlet pipe for discharging treated water, and the quicksand filter includes a water distribution area, a sand washing area and a sand filter area; the water distribution area Located at the lower part of the quicksand filter, the water distribution area is provided with a quicksand filter water distribution pipe, and the quicksand filter water distribution pipe is connected to the quicksand filter water inlet pipe. In order to achieve a better wastewater treatment effect, the quicksand filter water distribution pipes are arranged in concentric circles Shape, the water distribution pipe of the quicksand filter has a downward radiating water outlet; the sand washing area is located in the center of the quicksand filter, and is a cylindrical cylindrical structure, and the lower end opening of the cylindrical cylindrical structure is located at the bottom of the quicksand filter. The upper opening of the cylindrical cylindrical structure is located on the upper part of the quicksand filter, and the middle part of the sand washing area is equipped with an air lift pipe, which is connected to the quick sand filter blower outside the quick sand filter, and the upper part of the sand washing area is equipped with sand and water sedimentation and separation The upper part of the sand-water sedimentation separation area is provided with an overflow weir in the sand washing area, and the overflow weir in the sand washing area is connected to the sand washing water discharge pipe and the water inlet pipe of the crystallization sedimentation tank, and the lower part of the sand-water sedimentation separation area is provided with a sand return channel; The sand filter area is located on the periphery of the sand washing area. The sand filter area is filled with fine sand. The sand filter area is equipped with an overflow weir on the upper part of the sand filter area. The overflow weir in the sand filter area is connected to the outlet pipe of the quicksand filter. water into the storage tank.

A method for wastewater treatment using the above-mentioned iron-containing wastewater treatment device has the following steps:

①The iron-containing wastewater enters the regulating pond through the inlet pipe of the regulating pond to adjust the water quality, water quantity and pH value.

②The adjusted wastewater enters the reduction reaction tank, the reducing agent addition metering system adds the reducing agent sodium bisulfite, and the agitator in the reduction reaction tank stirs the wastewater to reduce the ferric ions in the wastewater to ferric ions that are prone to heterogeneous crystallization. Valence iron ions.

③The waste water after the reduction reaction enters the crystallization area through the water inlet pipe of the crystallization sedimentation tank, the crystallization inducer adding metering system adds the crystallization inducer, and the agitator in the crystallization area stirs and mixes the waste water.

④ Then the wastewater enters the wastewater flow channel in the sedimentation area, and the wastewater undergoes a crystallization reaction. The three-phase separator in the crystallization sedimentation tank realizes the separation of wastewater and solids, and the sediment sinks to the lower part of the sedimentation area under the action of gravity, and passes through the sediment at the bottom The discharge valve is discharged, and the settled wastewater enters the water inlet pipe of the quicksand filter through the overflow weir of the crystallization sedimentation tank and the outlet pipe of the crystallization sedimentation tank.

⑤Wastewater enters the lower part of the quicksand filter through the water inlet pipe of the quicksand filter and the water distribution pipe of the quicksand filter. The water distribution pipe of the quicksand filter realizes uniform water distribution, and the waste water enters the sand filter area. The sand filter area flows out from the overflow weir of the sand filter area and the outlet pipe of the quicksand filter, and enters the storage tank; the airflow generated by the blower of the quicksand filter drives the sand and water in the sand washing area to flow upwards, and at the same time washes the sand, and the airflow drives the sand washing The sand and water in the zone enter the sand-water sedimentation and separation zone. Due to the different specific gravity of sand and water, the fine sand settles down and flows into the sand filter zone through the sand return channel, so that the fine sand in the sand filter zone moves from top to bottom continuously. , the water in the sand-water sedimentation separation area enters the crystallization sedimentation tank for retreatment through the overflow weir in the sand washing area and the sand washing water discharge pipe.

⑥Reuse or further treatment of the effluent from the storage tank.

⑦ The sediment produced in the crystallization and sedimentation tank is recycled by concentration and dehydration.

The invention has the beneficial effects of adapting measures to local conditions, less infrastructure investment, convenient maintenance, lower energy consumption and better treatment effect on waste water.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In Fig. 1: 1. Reduction reaction tank, 1-1. Reduction reaction tank water inlet pipe, 1-2. Reductant adding metering system, 1-3. Reduction reaction tank agitator, 1-4. Reduction reaction tank outlet pipe.

Fig. 2 is a schematic structural diagram of a crystallization sedimentation tank according to an embodiment of the present invention.

In Fig. 2: 2. crystallization sedimentation tank, 2-1. crystallization area, 2-2. precipitation area, 2-3. crystallization sedimentation tank inlet pipe, 2-4. crystallization inducer adding metering system, 2-5. crystallization Zone agitator, 2-6. Partition plate, 2-7. Three-phase separator of crystallization sedimentation tank, 2-8. Overflow weir of crystallization sedimentation tank, 2-9. Sediment discharge valve.

Fig. 3 is a schematic structural view of a quicksand filter according to an embodiment of the present invention.

Among Fig. 3: 3. quicksand filter, 3-1. quicksand filter inlet pipe, 3-2. quicksand filter cloth water pipe, 3-3. gas lift pipe, 3-4. quicksand filter air blower, 3-5 . Sand washing area overflow weir, 3-6. Sand return channel, 3-7. Sand filter area overflow weir.

Fig. 4 is a process flow diagram of an embodiment of the present invention.

detailed description

The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

Example

As shown in Figures 1 to 4, an iron-containing wastewater pretreatment device of the present invention includes a regulating tank, a reduction reaction tank 1, a crystallization sedimentation tank 2, a quicksand filter tank 3 and a water storage tank, a regulating tank, a reduction reaction tank 1, The crystallization sedimentation tank 2, the quicksand filter tank 3 and the water storage tank are connected in sequence.

The regulating pond includes a regulating pond inlet pipe and a regulating pond outlet pipe for regulating the water quality, water quantity and pH value of the waste water.

The middle and upper part of the reduction reaction tank 1 is provided with a reduction reaction tank water inlet pipe 1-1, and the upper part of the reduction reaction tank is provided with a reducing agent addition metering system 1-2; the middle part of the reduction reaction tank is provided with a reduction reaction tank agitator 1 -3, the bottom of the reduction reaction tank is provided with a reduction reaction tank outlet pipe 1-4.

The reducing agent added by the reducing agent adding metering system 1-2 is sodium bisulfite.

The crystallization sedimentation tank 2 includes a crystallization area 2-1 and a precipitation area 2-2.

The middle and upper part of the crystallization zone 2-1 is provided with a crystallization sedimentation tank water inlet pipe 2-3, the upper part of the crystallization zone is provided with a crystallization inducer addition metering system 2-4, and the lower part of the crystallization zone is provided with a crystallization zone agitator 2- 5.

The crystallization inducer added by the added metering system of the crystallization inducer is quartz sand coated with sodium carbonate; the preparation process of the crystallization inducer is:

① Soak the quartz sand in 1mol/L sodium carbonate solution and shake it in a shaker for 24 hours;

② Filter the soaked quartz sand;

③ Wash the filtered quartz sand with deionized water;

④ drying the cleaned quartz to obtain a crystallization inducer.

A partition 2-6 is provided between the crystallization zone 2-1 and the precipitation zone 2-2, and the partition plate and the inner wall of the crystallization sedimentation tank form a waste water flow channel that enters the precipitation zone 2-2 as waste water, and the precipitation zone 2-2 The outlet of 2 is provided with a crystallization sedimentation tank three-phase separator 2-7, the upper part of the outlet of the sedimentation area is provided with a crystallization sedimentation tank overflow weir 2-8, the bottom of the sedimentation area is designed as a conical structure, and a sedimentation tank is arranged at the bottom of the conical structure. Material discharge valve 2-9. The overflow weir 2-8 of the crystallization sedimentation tank is connected to the outlet pipe of the crystallization sedimentation tank, and the outlet pipe of the crystallization sedimentation tank is connected to the water inlet pipe of the quicksand filter.

The quicksand filter 3 includes a quicksand filter inlet pipe 3-1 and a quicksand filter outlet pipe for discharging treated water, and the quicksand filter includes a water distribution area, a sand washing area and a sand filter area; The water distribution area is located at the lower part of the quicksand filter, and the water distribution area is provided with a quicksand filter water distribution pipe 3-2, and the quicksand filter water distribution pipe 3-2 is connected to the quicksand filter inlet pipe 3-1, so that the effect of wastewater treatment is better , the quicksand filter water distribution pipe 3-2 is arranged in a concentric circle shape, and the quicksand filter water distribution pipe has a downward radiating water outlet; the described sand washing area is located in the center of the quicksand filter and is a cylindrical tubular structure , the lower opening of the cylindrical cylindrical structure is located at the bottom of the quicksand filter, the upper opening of the cylindrical cylindrical structure is located at the upper part of the quicksand filter, and the middle part of the sand washing area is provided with an air lift pipe 3-3, and an air lift pipe 3-3 Connect the quicksand filter blower 3-4 outside the quicksand filter. The upper part of the sand washing area is provided with a sand-water sedimentation separation area. The upper part of the sand-water sedimentation separation area is equipped with a sand washing area overflow weir 3-5. 3-5 Connect the sand washing water discharge pipe and the water inlet pipe of the crystallization sedimentation tank, and the lower part of the sand water sedimentation separation area is provided with a sand return channel 3-6; the sand filter area is located on the periphery of the sand washing area, and the sand filter area is filled with There is fine sand, and the upper part of the sand filter area is provided with a sand filter area overflow weir 3-7, and the sand filter area overflow weir 3-7 is connected to the outlet pipe of the quicksand filter, and the water filtered by the quicksand filter enters the storage tank for reuse.

A method for wastewater treatment using the above-mentioned iron-containing wastewater treatment device has the following steps:

①The iron-containing wastewater enters the regulating pond through the inlet pipe of the regulating pond to adjust the water quality, water quantity and pH value.

②The adjusted wastewater enters the reduction reaction tank 1, the reducing agent addition metering system 1-2 adds the reducing agent sodium bisulfite, and the reduction reaction tank agitator 1-3 stirs the wastewater to reduce the ferric ions in the wastewater to Divalent iron ions prone to heterogeneous crystallization.

③ The waste water after the reduction reaction enters the crystallization area 2-1 through the water inlet pipe 2-3 of the crystallization sedimentation tank, the crystallization inducer adding metering system 2-4 adds the crystallization inducer, and the agitator 2-5 in the crystallization area stirs and mixes the wastewater.

④ Then the waste water enters the waste water flow channel of the sedimentation area, and the waste water undergoes a crystallization reaction, and the three-phase separator 2-7 of the crystallization sedimentation tank realizes the separation of waste water and solids, and the sediment sinks to the lower part of the sedimentation area under the action of gravity, and passes through the bottom The sediment discharge valve 2-9 discharges, and the waste water after the precipitation enters the quicksand filter tank inlet pipe 3-1 through the crystallization sedimentation tank overflow weir 2-8 and the crystallization sedimentation tank outlet pipe.

⑤The waste water enters the lower part of the quicksand filter through the water inlet pipe 3-1 of the quicksand filter and the water distribution pipe 3-2 of the quicksand filter. The waste water is further filtered, and then the waste water passes through the sand filter area, flows out from the sand filter area overflow weir 3-7 and the quicksand filter outlet pipe, and enters the storage tank; the air flow produced by the quick sand filter air blower 3-4 drives the sand washing area The sand and water flow upwards and wash the sand at the same time, and then the sand and water enter the sand-water sedimentation and separation area. Due to the different specific gravity of the sand and water, the fine sand settles down and flows into the sand filter area through the sand return channel 3-6 to realize sand filtration. The fine sand in the filter area moves continuously from top to bottom, and the water in the sand-water sedimentation separation area passes through the overflow weir 3-5 in the sand washing area and the sand washing water discharge pipe into the crystallization sedimentation tank for reprocessing.

⑥Reuse or further treatment of the effluent from the storage tank.

⑦ The sediment produced in the crystallization and sedimentation tank is recycled by concentration and dehydration.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (2)

1. A kind of 1. iron content waste water pretreatment unit, it is characterised in that：Including regulating reservoir, reduction reaction pond (1), crystalline deposit pond (2), quicksand filter tank (3) and tank, regulating reservoir, reduction reaction pond (1), crystalline deposit pond (2), quicksand filter tank (3) and water storage Pond is sequentially communicated；

   Described regulating reservoir includes regulating reservoir water inlet pipe and regulating reservoir outlet pipe, for adjusting the water quality, water and pH value of waste water；

   The middle and upper part of described reduction reaction pond (1) is provided with reduction reaction pond water inlet pipe (1-1), and the top of reduction reaction pond is set It is equipped with reducing agent addition metering system (1-2)；Reduction reaction pond agitator (1-3) is provided with the middle part of reduction reaction pond, is reduced The bottom of reaction tank is provided with reduction reaction pond outlet pipe (1-4)；

   The reducing agent of described reducing agent addition metering system (1-2) addition is sodium hydrogensulfite；

   Described crystalline deposit pond (2) includes crystal region (2-1) and settling zone (2-2)；

   The middle and upper part of described crystal region (2-1) is provided with crystalline deposit pond water inlet pipe (2-3), and the top of crystal region is provided with knot Brilliant derivant addition metering system (2-4), the bottom of crystal region is provided with crystal region agitator (2-5)；

   The crystallization derivant of described crystallization derivant addition metering system addition is the quartz sand of coating sodium carbonate；

   The preparation process of described crystallization derivant is：

   Soaked 1. quartz sand is put into 1mol/L sodium carbonate liquor, 24h is vibrated in shaking table；

   2. by the quartz sand filtration after immersion；

   3. the quartz sand after filtering is cleaned with deionized water；

   4. the quartz after cleaning is dried, crystallization derivant is made；

   Dividing plate (2-6), the dividing plate and the inwall shape in crystalline deposit pond are provided between the crystal region (2-1) and settling zone (2-2) Into the waste water runner for entering settling zone (2-2) as waste water, the exit of settling zone (2-2) is provided with crystalline deposit pond three phase separation Device (2-7), the outlet top of settling zone are provided with crystalline deposit pond overfalling weir (2-8), the tapered structure of settling zone bottom design, Pyramidal structure bottom is provided with sediment discharge valve (2-9)；Crystalline deposit pond overfalling weir (2-8) connects crystalline deposit pond water outlet Pipe, crystalline deposit pond outlet pipe connection flow sand filter water inlet pipe；

   The quicksand filter tank outlet pipe of water after the quicksand filter tank (3) includes quicksand filter tank water inlet pipe (3-1) and handled for discharge, Described quicksand filter tank includes water distribution area, washed-out sand area and sand filtration area；Described water distribution area is located at the bottom in quicksand filter tank, water distribution area Provided with quicksand filter tank water distributor (3-2), quicksand filter tank water distributor (3-2) connection flow sand filter water inlet pipe (3-1), at waste water The effect of reason is more preferable, and described quicksand filter tank water distributor (3-2) is arranged to concentric circles, have on the water distributor of quicksand filter tank to Lower radiation delivery port；Described washed-out sand area is located at the center in quicksand filter tank, is cylindrical barrel structure, under cylindrical barrel structure End opening is located at the bottommost in quicksand filter tank, and cylindrical barrel structure upper end open is located at the top in quicksand filter tank, washed-out sand area Middle part is provided with stripping tube (3-3), the quicksand filter tank air blower (3-4) outside stripping tube (3-3) connection flow sand filter, washed-out sand area it is upper Portion is provided with sand water sedimentation Disengagement zone, and the top of sand water sedimentation Disengagement zone is provided with washed-out sand area overfalling weir (3-5), washed-out sand area overfalling weir (3-5) connects washed-out sand water discharge spout and crystalline deposit pond water inlet pipe, the bottom of sand water sedimentation Disengagement zone are provided with back sand passage (3- 6)；Described sand filtration area is located at the periphery in washed-out sand area, and fine sand is filled with sand filtration area, and sand filtration area top is provided with sand filtration area overfalling weir (3-7), sand filtration area overfalling weir (3-7) connection flow sand filter outlet pipe, the water after the processing of quicksand filter return into tank With.
2. A kind of 2. iron content waste water pretreatment unit according to claim 1, it is characterised in that：It is pre- using above-mentioned iron content waste water The method that processing unit carries out wastewater treatment, has following steps；

   1. iron content waste water enters regulating reservoir, regulating water quality, water and pH value by regulating reservoir water inlet pipe；

   2. the waste water after regulation enters reduction reaction pond (1), reducing agent addition metering system (1-2) addition reducing agent bisulfite Sodium, reduction reaction pond agitator (1-3) are stirred to waste water, the ferric ion in waste water are reduced into out-phase knot easily occurs Brilliant ferrous ion；

   3. the waste water after reduction reaction enters knot by reduction reaction pond outlet pipe (1-4) and crystalline deposit pond water inlet pipe (2-3) Crystalline region (2-1), crystallization derivant addition metering system (2-4) addition crystallization derivant, crystal region agitator (2-5) enter to waste water Row is stirred；

   4. and then waste water enters the waste water runner of settling zone, crystallization reaction, crystalline deposit pond three phase separator (2-7) occur for waste water The separation of waste water and solid is realized, sediment sinks to the bottom of settling zone under gravity, passes through the sediment of bottom Drain valve (2-9) is discharged, and the waste water after precipitation enters to become a mandarin by crystalline deposit pond overfalling weir (2-8) and crystalline deposit pond outlet pipe Sand filter water inlet pipe (3-1)；

   5. waste water enters the bottom in quicksand filter tank, quicksand by quicksand filter tank water inlet pipe (3-1), quicksand filter tank water distributor (3-2) Filter tank water distributor (3-2) realizes water distribution uniformity, and waste water enters sand filtration area, and the pollutant in waste water is further filtered, and is then given up Water passes through sand filtration area, is flowed out by sand filtration area overfalling weir (3-7) and quicksand filter tank outlet pipe, into tank；The air blast of quicksand filter tank Air-flow caused by machine (3-4) drives the Sha Heshui in washed-out sand area to flow up, while sand is rinsed, and then sand and water enter Sand water sedimentation Disengagement zone, because sand is different with the proportion of water, fine deposition goes down and flows into sand filtration by returning sand passage (3-6) Area, realizes the movement of fine sand in sand filtration area constantly from top to bottom, and the water in sand water sedimentation Disengagement zone passes through washed-out sand area overfalling weir (3-5) and washed-out sand water discharge spout are reprocessed into crystalline deposit pond；

   6. the effluent reuse of tank or further processing；

   7. sediment caused by crystalline deposit pond is concentrated, dehydration recycles.