CN209143918U - Waste water treatment system in nitro-chlorobenzene production - Google Patents

Abstract

The utility model proposes nitro-chlorobenzene production in waste water treatment system, including heat exchanger, it is layered tank, first former pond, second former pond, accurate pressure filter, adsorption tower, sedimentation basin, micro cell, oxidative degradation pond, tank is layered to be used to carry out static layering to the waste water after cooling, first partition is set inside sedimentation basin, second partition, third partition, processing space segmentation is independent a Room, two Room, three Room, the utility model is respectively provided with sedimentation basin and micro cell for the processed clean-up performance of raw water, oxidative degradation pond, when the water water turbidity of adsorption tower discharge, when impurity is more, it is handled using sedimentation basin, when the water water quality of adsorption tower discharge is limpid, impurity is few, and content of organics it is more when, using micro cell, the processing of oxidative degradation pond, it then again will be after degradation, contain small organic molecule Three Room that water is again introduced into sedimentation basin carry out flocculating setting removal of impurities.

Description

Waste water treatment system in nitro-chlorobenzene production

Technical field

The utility model relates to waste water in chemical production wastewater processing technology field more particularly to a kind of production of nitro-chlorobenzene Processing system.

Background technique

In nitro-chlorobenzene production process, nitro-chlorobenzene is prepared using Benzene Chloride and nitric acid, sulfuric acid mixture reaction, In the waste water generated in reaction process containing largely have neither part nor lot in the Benzene Chloride of reaction, reaction is completed or intermediate organic matter, Nitro compounds etc., in original art, these waste water are discharged by simple filtering precipitating, wherein untreated clean miscellaneous Confrontation surrounding enviroment and water resource cause seriously to pollute.

Summary of the invention

It is necessary to propose waste water treatment system in a kind of nitro-chlorobenzene production of fine processing.

Waste water treatment system in a kind of production of nitro-chlorobenzene, including heat exchanger, layering tank, the first former pond, the second raw water Pond, accurate pressure filter, adsorption tower, sedimentation basin, micro cell, oxidative degradation pond, heat exchanger is for receiving in nitro-chlorobenzene production The waste water of generation, and heat exchange cooling is carried out to waste water, layering tank is connect with heat exchanger, and layering tank is hollow tank body, for drop Waste water after temperature carries out static layering, and the overflow port for being layered tank top is connect with the first former pond, is layered the outlet of pot bottom For the Benzene Chloride after settling to be discharged, the first former pond is the pond body of open top, and removable top cover is covered at the top of pond body, Means for feeding acid is set above the water inlet at the top of pond body, acidic materials are added to the first former pond, carries out pH value It adjusts, is connect in one end of the pipeline pipeline of the top of the first former pond setting discharge raw water with the outlet of the first former pond, separately One end is connect with accurate pressure filter, and second former pond has identical structure with the first former pond, and accurate filter is inside The closed container for filling filler, in the bottom of accurate filter, setting discharge line is filled out inside adsorption tower with connecting with adsorption tower Discharge line is arranged in the bottom of filling material, adsorption tower, and to connect with sedimentation basin or micro cell, sedimentation basin is open-topped pond Body, is arranged first partition, second partition, third partition inside sedimentation basin, and first partition is set close to a side wall of sedimentation basin It sets, pond body is divided into sediment space and processing space, the volume of sediment space is greater than the volume of processing space, and described second Partition and third partition are set to inside processing space, and processing space segmentation is independent a Room, two Room, three Room, described One Room, two Room, three Room are successively disposed adjacent, and the discharge line for adsorbing tower bottom is connected to a Room, a Room, two Room and three Room bottom Portion is the bottom of taper, and the conical lower portion of two Room is enclosed construction, and the conical lower portion of a Room opens up communication port, the taper of three Room Bottom also opens up communication port, and communicating passage is arranged in the communication port of a Room bottom and between the communication port of three Room bottoms, will One Room is connected to three Room, opens up first through hole on the third partition also between three Room and two Room, and three Room are connected to two Room, The second through-hole is opened up on first partition also between two Room and sediment space, two Room are connected to sediment space, it is described The height of first through hole is lower than the height of the second through-hole, opens up outlet on the side wall of the sediment space, will handle Complete water is sent out, and acid-base accommodation device also is arranged in the top of sediment space, and acidic materials or alkaline matter are added to heavy In the space of shallow lake, to adjust water as neutrality, the micro cell is rectangular pond body, and tetrafluoro sieve plate, tetrafluoro is arranged in the bottom of micro cell Aerated conduit is set in the space below sieve plate, the 4th partition, the 5th partition, the are set gradually in the space above tetrafluoro sieve plate Pond body is divided into and flows into room, left reaction chamber, right reaction chamber, delivery chamber, puts in left reaction chamber and right reaction chamber by six partitions It sets micro cell and raw material occurs, the 4th partition, the 6th partition are connect with tetrafluoro sieve plate, and the top of the 5th partition is lower than pond body side Wall forms overflow port, overflow launder also is arranged on the side wall of delivery chamber, to connect with oxidative degradation pond, oxidative degradation adds in pond Oxidation reinforced dose, the overflow outlet in oxidative degradation pond is connected to three Room of the sedimentation basin, and flocculation is arranged in the top of three Room Agent adding set, to carry out flocculating setting collection to the small organic molecule after degradation.

The layering tank of the utility model setting is first layered raw water, so that the biggish Benzene Chloride sedimentation discharge of specific gravity, It is reacted for circulating repetition, not only reduces the load of raw water postorder processing, also substantially increase the service efficiency of Benzene Chloride, dropped Low cost.

First former pond, the second former pond not only can be each other as stand-by equipments, but also can be used as storage raw water and dry in the air Shine the equipment of aeration, acid-base accommodation can also be carried out from process start, to be suitble to adsorption tower absorption, the density of accurate filter compared with Greatly, to be filtered to remove granule foreign precipitating, resin material is set inside adsorption tower, is inhaled for neutral substance remaining in water Attached removing, sedimentation basin further adjusts acid-base property, aeration, then contamination precipitation is precipitated away.

The utility model is respectively provided with sedimentation basin and micro cell, oxidative degradation for the processed clean-up performance of raw water Pond is handled when the water water turbidity of adsorption tower discharge, impurity are more using sedimentation basin, when the water water quality of adsorption tower discharge It is limpid, impurity is few, and when content of organics is more, handled using micro cell, oxidative degradation pond, then again by it is after degradation, contain Three Room for having the water of small organic molecule to be again introduced into sedimentation basin carry out flocculating setting removal of impurities.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of waste water treatment system in nitro-chlorobenzene production.

Fig. 2 is the top view of the sedimentation basin.

Fig. 3 is the cross-sectional view in Fig. 2 along A-A.

Fig. 4 is the schematic diagram of the another embodiment of Fig. 3.

Fig. 5 is the top view of the first former pond.

Fig. 6 is the internal structure chart of the first former pond main view direction.

Fig. 7 is the internal structure chart of the main view direction of micro cell.

Fig. 8 is the internal structure chart of the overlook direction in oxidative degradation pond.

Fig. 9 is the zigzag schematic diagram of the top edge for the side wall that elongated spout is connect with third oxidizing chamber.

Figure 10 is the internal view of the another embodiment of aeration tube in the first former pond.

Figure 11 is the top view of the another embodiment of aeration tube in the first former pond.

In figure: heat exchanger 10, layering tank 20, the first former pond 30, means for feeding acid 31, the second former pond 40, accurate filters pressing Device 50, adsorption tower 60, upper layer filler 61, lower layer's filler 62, sedimentation basin 70, first partition 71, the second through-hole 711, second partition 72, third partition 73, first through hole 731, a Room 74, two Room 75, three Room 76, communicating passage 761, bending bottom 762, precipitating are empty Between 77, pressure filter 80, micro cell 90, tetrafluoro sieve plate 91, aerated conduit 92, flow into room 93, left reaction chamber 94, right reaction chamber 95, delivery chamber 96, overflow launder 961, the 4th partition 97, the 5th partition 98, the 6th partition 99, oxidative degradation pond 100, elongated inflow Slot 101, the 7th partition 102, the 8th partition 103, the 9th partition 104, elongated spout 105, the first oxidizing chamber 106, the second oxygen Change room 107, third oxidizing chamber 108, surge chamber 109.

Specific embodiment

It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the utility model, for this For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others Attached drawing.

Referring to Fig. 1 to Fig. 9, the utility model embodiment provides waste water treatment system in a kind of production of nitro-chlorobenzene, packet Include heat exchanger 10, layering tank 20, the first former pond 30, the second former pond 40, accurate pressure filter 50, adsorption tower 60, sedimentation basin 70, Micro cell 90, oxidative degradation pond 100, heat exchanger 10 are used to receive the waste water that generates in nitro-chlorobenzene production, and to waste water into Row heat exchange cooling, layering tank 20 are connect with heat exchanger 10, and layering tank 20 is hollow tank body, quiet for carrying out to the waste water after cooling It is only layered, the overflow port at 20 top of layering tank is connect with the first former pond 30, and the outlet of layering 20 bottom of tank is heavy for being discharged Benzene Chloride after drop, the first former pond 30 are the pond body of open top, removable top cover are covered at the top of pond body, on pond body top Means for feeding acid 31 is set above the water inlet in portion, acidic materials are added to the first former pond 30, carries out pH value adjusting, In the pipeline of the top of the first former pond 30 setting discharge raw water, one end of pipeline is connect with the outlet of the first former pond 30, separately One end is connect with accurate pressure filter 50, and second former pond 40 has identical structure, accurate filter with the first former pond 30 50 be the internal closed container for filling filler, and discharge line is arranged in the bottom of accurate filter 50, to connect with adsorption tower, inhales Filler is filled inside attached tower, discharge line, to connect with sedimentation basin 70 or micro cell 90, sedimentation basin is arranged in the bottom of adsorption tower 70 be open-topped pond body, inside sedimentation basin 70 be arranged first partition 71, second partition 72, third partition 73, first every Plate 71 is arranged close to a side wall of sedimentation basin 70, and pond body is divided into sediment space 77 and processing space, sediment space 77 Volume be greater than processing space volume, the second partition 72 and third partition 73 are set to inside processing space, will locate The segmentation of reason space is independent a Room 74, two Room 75, three Room 76, and a Room 74, two Room 75, three Room 76 are successively disposed adjacent, The discharge line of absorption tower bottom is connected to a Room 74, and the bottom of a Room 74, two Room 75 and three Room 76 is the bottom of taper, and two The conical lower portion of room 75 is enclosed construction, and the conical lower portion of a Room 74 opens up communication port, the conical lower portion of the three Room 76 also company of opening up Communicating passage 761 is arranged in the communication port of 74 bottom of a Room and between the communication port of three Room, 76 bottom, by a Room 74 in port It is connected to three Room 76, first through hole 731 is opened up on the third partition 73 also between three Room 76 and two Room 75, by three Room, 76 He Two Room 75 are connected to, and the second through-hole 711 are opened up on first partition also between two Room 75 and sediment space 77, by two Room 75 It is connected to sediment space 77, the height of the first through hole 731 is lower than the height of the second through-hole 711, in the sediment space 77 Side wall on open up outlet, by the water being disposed send out, also sediment space 77 top be arranged acid-base accommodation device, Being added acidic materials or alkaline matter to sediment space 77, to adjust water as neutrality, the micro cell 90 is rectangular Pond body, the bottom of micro cell are arranged tetrafluoro sieve plate 91, aerated conduit 92, tetrafluoro sieve plate are arranged in the space of 91 lower section of tetrafluoro sieve plate The 4th partition 97, the 5th partition 98, the 6th partition 99 are set gradually in the space of 91 tops, pond body is divided into and flows into room 93, left reaction chamber 94, right reaction chamber 95, delivery chamber 96 place micro cell in left reaction chamber 94 and right reaction chamber 95 and original occur Material, the 4th partition 97, the 6th partition 99 are connect with tetrafluoro sieve plate 91, and the top of the 5th partition 98 is lower than pond body side wall, shape At overflow port, overflow launder 961, to connect with oxidative degradation pond 100, oxidative degradation pond are set also on the side wall of delivery chamber 96 Strong oxidizer is added in 100, the overflow outlet in oxidative degradation pond 100 is connected to three Room 76 of the sedimentation basin 70, in three Room Flocculant adding apparatus is arranged in 76 top, to carry out flocculating setting collection to the small organic molecule after degradation.

Sedimentation basin 70 is divided into sediment space 77 and processing space, and processing space is divided into three rooms again, and a Room 74 is used It is adjusted according to the pH value of water quality, so that water quality meets the requirement of postorder desalination process, aerator is set inside three Room 76, Water is further aerated, and the setting of communicating passage 761, keeps the acid-base accommodation material mixing that a Room 74 is added more uniform, One Room 74, two Room 75 and three Room 76 are connected to the channel for forming tortuous detour, so that the acid-base accommodation material mixing in water is more equal It is even, and two Room 75 are connect eventually as cushion space with sediment space 77, and the water for flowing into sediment space 77 is uniformly mixed, Consistency is good.

Referring to Fig. 5,6,10,11, further, aerator is also set in the first former pond 30, the aerator is set It is placed in the bottom of the first former pond 30, and is located at center, aerator is round coil, is opened on the side wall of round coil If stomata, entered inside the first former pond 30 with the compressed air that is fed in round coil, the stomata open up direction to Obliquely downward inclination, the bottom of first former pond 30 is intermediate convex bottom of pond high, edge is low, also at the edge of convex bottom of pond Sewage pipe is set.The tubulation that round coil compares with linear, no bending dead angle, gas vent are not easy to plug, convex bottom of pond Setting is conducive to the impurity in raw water or is deposited in water flow and the lower nature of weight effect to edge flowing, flows to sewage pipe, convenient Cleaning, without artificial individually that impurity is mobile to edge, aerator is also disposed on center in addition, as gas emits upwards It drives raw water to float upwards out, the impurity in raw water has also further been pushed to deposit to from center to edge is mobile.Wherein, stomata Open up direction oliquely downward inclined design, it may have special effect, compressed gas is along the stomata opened up diagonally downward Discharge, into inside pond body, the water inside pond body to floating is seethed, and gas can also be used as the power source seethed, make It obtains raw water to seethe from bottom to top, so that the contamination precipitation settled downwards is also blown to suspension, then settle, and gas is also blown To convex bottom of pond, so that the precipitating being deposited among bottom of pond is not blown to suspension yet, then settles, further avoid to edge The deposition in pool bottom middle position also helps collect to edge and precipitate.

Further, the filler inside the adsorption tower includes upper layer filler 61 and lower layer's filler 62, of upper layer filler 61 Granularity and compactness are less than the granularity and compactness of lower layer's filler 62, and the thickness of upper layer filler 61 is greater than lower layer's filler 62 Thickness, upper layer filler 62 are absorption resin, it is preferred that are storng-acid cation exchange resin, lower layer's filler 62 is quartz sand.

Further, the oxidative degradation pond 100 is rectangular pond body, and elongated inflow slot is arranged inside oxidative degradation pond 100 101, the 7th partition 102, the 8th partition 103, the 9th partition 104, elongated spout 105, elongated inflow slot 101 are set to oxidation On one side wall inner wall of degraded pond 100, to be connect with the overflow launder 961 of micro cell 90, the 8th partition 103, the 9th partition 104 are arranged along pond body length direction, and pond body is divided into the first oxidizing chamber 106, the second oxidizing chamber 107, third oxidizing chamber 108, the segmentation of the first oxidizing chamber 106 is formed one and elongated stream with inside the first oxidizing chamber 106 by the setting of the 7th partition 102 Enter the surge chamber 109 of the connection of slot 101, elongated spout 105 is set to another interior of pond body, with third oxidizing chamber 108 are disposed adjacent, and the end of elongated spout 105 is connected to by pipeline with three Room 76 of sedimentation basin 70, surge chamber 109 and first The bottom of oxidizing chamber 106 is connected to, and the top connection of the first oxidizing chamber 106, the second oxidizing chamber 107 forms overflow, the second oxidizing chamber 107, the bottom of third oxidizing chamber 108 is connected to, and is connected at the top of third oxidizing chamber 108 and elongated spout 105, forms overflow, also Hydrogen peroxide adding apparatus is set in the elongated top for flowing into slot 101, hydrogen peroxide is added with stream to elongated inflow slot 101 In water.

Hydrogen peroxide is added by the way of being added with stream, reduces the step of being stirred, and dioxygen can be made by being added with stream The dosage of water is controllable, and flow regime mixes so that hydrogen peroxide mix more uniform with water, and reaction is more sufficiently thorough, improves pair The reaction efficiency and utilization rate of oxygen water.

Surge chamber 109, the first oxidizing chamber 106, the second oxidizing chamber 107, third oxidizing chamber 108, elongated spout 105 are two-by-two Between using S type be connected to, not only elongated liquid flowing distance, flow velocity is slow, and the hydrogen peroxide for being comes into full contact with water, Sufficiently reaction.

Further, the top edge for the side wall that elongated spout 105 is connect with third oxidizing chamber 108 is zigzag, to slow down Flow velocity forms current stabilization.

Further, setting drains pipeline below the taper of two Room, 75 bottom of sedimentation basin 70, for sediment to be discharged, puts Although valve is arranged on road, the bottom of the communicating passage 761 between a Room 74 and three Room 76 is bending bottom 762, bends bottom 762 minimum point is arranged close to three Room 76, and setting drains pipeline below the minimum point of bending bottom 762, for precipitating to be discharged Object.Bending bottom 762 can elongate the length of flow that liquid flows to three Room 76 from a Room 74, using precipitate, and with The direction of water flow, forms impact nest close to 762 minimum point of bending bottom of three Room 76 setting, forms choked flow limitation to sediment, And then be conducive to precipitating here sedimentation collect, from drain pipeline discharge.

Further, the processing system further includes pressure filter 80, also sedimentation basin 70 bottom be arranged discharge line, with Pressure filter 80 connects, and then filters again.

Module or unit in the utility model embodiment device can be merged according to actual needs, divide and be deleted Subtract.

Above disclosures are merely preferred embodiments of the utility model, the utility model cannot be limited with this certainly Interest field, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and according to this reality The equivalent variations made by novel claim, still falls within the scope of the utility model.

Claims (7)

1. waste water treatment system in a kind of production of nitro-chlorobenzene, it is characterised in that: including heat exchanger, layering tank, the first former pond, Second former pond, accurate pressure filter, adsorption tower, sedimentation basin, micro cell, oxidative degradation pond, heat exchanger is for receiving nitroxyl chloride The waste water generated in benzene production, and heat exchange cooling is carried out to waste water, layering tank is connect with heat exchanger, and layering tank is hollow tank body, For carrying out static layering to the waste water after cooling, the overflow port for being layered tank top is connect with the first former pond, is layered pot bottom Outlet be used for be discharged sedimentation after Benzene Chloride, the first former pond be open top pond body, be covered at the top of pond body Means for feeding acid is arranged above the water inlet at the top of pond body in removable top cover, and acidic materials are added to the first former pond, into Row pH value is adjusted, and in the pipeline of the top of the first former pond setting discharge raw water, one end of pipeline goes out with the first former pond Mouth connection, the other end are connect with accurate pressure filter, and second former pond has identical structure, secondary filter with the first former pond Device is the closed container of internal filling filler, and discharge line is arranged in the bottom of accurate filter, to be connect with adsorption tower, absorption Filler is filled inside tower, discharge line is arranged in the bottom of adsorption tower, and to connect with sedimentation basin or micro cell, sedimentation basin is top The pond body of opening, inside sedimentation basin be arranged first partition, second partition, third partition, first partition close to sedimentation basin one Pond body is divided into sediment space and processing space by a side wall setting, and the volume of sediment space is greater than the volume of processing space, The second partition and third partition are set to inside processing space, and processing space segmentation is independent a Room, two Room, three Room, a Room, two Room, three Room are successively disposed adjacent, and the discharge line for adsorbing tower bottom is connected to a Room, a Room, two Room and The bottom of three Room is the bottom of taper, and the conical lower portion of two Room is enclosed construction, and the conical lower portion of a Room opens up communication port, and three The conical lower portion of room also opens up communication port, the communication port of a Room bottom and between the communication port of three Room bottoms setting connection it is logical One Room is connected to by road with three Room, first through hole is opened up on the third partition also between three Room and two Room, by three Room and two Room connection, also opens up the second through-hole on first between two Room and sediment space partition, and two Room and sediment space are connected Logical, the height of the first through hole is lower than the height of the second through-hole, and outlet is opened up on the side wall of the sediment space, will The water being disposed is sent out, and acid-base accommodation device also is arranged in the top of sediment space, acidic materials or alkaline matter are added Enter to sediment space, to adjust water as neutrality, the micro cell is rectangular pond body, and the bottom setting tetrafluoro of micro cell sieves Plate is arranged aerated conduit in the space below tetrafluoro sieve plate, sets gradually the 4th partition, the 5th in the space above tetrafluoro sieve plate Pond body is divided into and flows into room, left reaction chamber, right reaction chamber, delivery chamber by partition, the 6th partition, anti-in left reaction chamber and the right side Answer indoor placement micro cell that raw material occur, the 4th partition, the 6th partition are connect with tetrafluoro sieve plate, and the top of the 5th partition is low In pond body side wall, overflow port is formed, overflow launder also is set on the side wall of delivery chamber, to be connect with oxidative degradation pond, oxidation drop Strong oxidizer is added in Xie Chi, the overflow outlet in oxidative degradation pond is connected to three Room of the sedimentation basin, in the top of three Room Flocculant adding apparatus is set, to carry out flocculating setting collection to the small organic molecule after degradation.

2. waste water treatment system in nitro-chlorobenzene production as described in claim 1, it is characterised in that: also in the first former pond Aerator is set, and the aerator is set to the bottom of the first former pond, and is located at center, and aerator is circle Coil pipe opens up stomata on the side wall of round coil, is entered in the first former pond with the compressed air being fed in round coil The direction that opens up in portion, the stomata oliquely downward tilts, and the bottom of first former pond is intermediate convex pond high, edge is low Also sewage pipe is arranged at the edge of convex bottom of pond in bottom.

3. waste water treatment system in nitro-chlorobenzene production as described in claim 1, it is characterised in that: inside the adsorption tower Filler includes upper layer filler and lower layer's filler, and the granularity and compactness of upper layer filler are less than the granularity of lower layer's filler and closely knit Degree, and the thickness of upper layer filler is greater than the thickness of lower layer's filler, upper layer filler is absorption resin, and lower layer's filler is quartz sand.

4. waste water treatment system in nitro-chlorobenzene production as described in claim 1, it is characterised in that: the oxidative degradation pond is Elongated inflow slot, the 7th partition, the 8th partition, the 9th partition, elongated outflow is arranged in rectangular pond body inside oxidative degradation pond Slot, elongated inflow slot is set on a side wall inner wall in oxidative degradation pond, to be connect with the overflow launder of micro cell, the 8th every Plate, the 9th partition are arranged along pond body length direction, and pond body is divided into the first oxidizing chamber, the second oxidizing chamber, third and is aoxidized Room, the setting of the 7th partition to form one and are connected to the elongated slot that flows into inside the first oxidizing chamber, the first oxidizing chamber divided Surge chamber, elongated spout are set to another interior of pond body, to be disposed adjacent with third oxidizing chamber, elongated spout End be connected to three Room of sedimentation basin by pipeline, surge chamber is connected to the bottom of the first oxidizing chamber, the first oxidizing chamber, second The top of oxidizing chamber is connected to, and forms overflow, the bottom connection of the second oxidizing chamber, third oxidizing chamber, third oxidizing chamber and elongated stream Groove top portion connection out forms overflow, and hydrogen peroxide adding apparatus also is arranged in the elongated top for flowing into slot, and hydrogen peroxide is added with stream Enter into the water in elongated inflow slot.

5. waste water treatment system in nitro-chlorobenzene production as claimed in claim 4, it is characterised in that: elongated spout and third The top edge of the side wall of oxidizing chamber connection is zigzag, to slow down flow velocity, forms current stabilization.

6. waste water treatment system in nitro-chlorobenzene production as described in claim 1, it is characterised in that: at two Room bottoms of sedimentation basin Setting drains pipeline below the taper in portion, for sediment to be discharged, drains and valve is arranged on pipeline, the company between a Room and three Room The bottom of circulation passage is bending bottom, and the minimum point for bending bottom is arranged close to three Room, is set below the minimum point of bending bottom Although road is put, for sediment to be discharged.

7. waste water treatment system in nitro-chlorobenzene production as described in claim 1, it is characterised in that: the processing system is also wrapped Pressure filter is included, discharge line also is set in the bottom of sedimentation basin, to be connect with pressure filter, and then is filtered again.