A system for removing oil and COD from P507 raffinate

Abstract

The utility model relates to a kind of P507 raffinate oil removal COD system, and it relates to wastewater treatment technical field.The P507 raffinate oil removal COD system includes the pretreatment system, filtration system, oxidation system that are sequentially communicated, pretreatment system includes the pre-oxidation equipment, flocculation equipment, sedimentation equipment that are sequentially communicated, filtration system includes the filtration equipment, filter water production equipment and backwashing system that are sequentially communicated, and oxidation system includes the ozone generator, oxidation equipment that are sequentially communicated.The system can effectively remove oil and COD in lithium battery industry P507 raffinate, and without resin treatment, without class a dangerous substance, low operating cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field especially relates to a P507 raffinate oil removal COD system. BACKGROUND

[0002] With the rapid development of lithium battery industry, the production of P507 raffinate of lithium battery industry also increases. At present, the oil removal process of wastewater of the same industry in the market mainly includes air floatation method, coalescence material method and resin method. The oil in P507 raffinate is mainly sulfonated kerosene, most of which is in dissolved state. The air floatation method and the coalescence material method can only remove suspended oil and part of emulsified oil, and it is difficult to treat dissolved oil. The resin method can remove dissolved oil, but the resin used in the market at present is mainly analyzed by ethanol, which needs to be separated from the class A device area, has high danger, large occupation area and high resin replacement cost. In addition, the air floatation method, the coalescence material method and the resin method used in the market at present are only used for oil removal, and have little effect on COD removal.

[0003] Therefore, a system capable of removing oil and COD from P507 raffinate is urgently needed. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the utility model provides a P507 raffinate oil removal COD system, which can effectively remove dissolved oil and COD without resin equipment.

[0005] In order to achieve the above purpose, the utility model provides a P507 raffinate oil removal COD system, which comprises a pretreatment system, a filtration system and an oxidation system which are sequentially connected. The pretreatment system comprises a pre-oxidation device, a flocculation device and a sedimentation device which are sequentially connected. The filtration system comprises a filtration device, a filtration water production device and a backwashing system which are sequentially connected. The oxidation system comprises an ozone preparation device and an oxidation device which are sequentially connected.

[0006] The above system can effectively remove oil and COD in P507 raffinate of lithium battery industry, and does not need resin treatment, has no class A dangerous substance and has low operation cost.

[0007] In one of the embodiments, the pre-oxidation device comprises a pre-oxidation tank, and the pre-oxidation tank is provided with a pre-oxidation agent dosing device and an alkali dosing device.

[0008] In one of the embodiments, the flocculation device comprises a flocculation tank, and the flocculation tank is provided with a flocculant dosing device.

[0009] The sedimentation device comprises a sedimentation tank, and the sedimentation tank is provided with a sludge discharge system and a sludge dewatering system.

[0010] In one of the embodiments, the alkali dosing device is used for adding sodium hydroxide solution.

[0011] In one of the embodiments, the pre-oxidant dosing device is used for dosing hydrogen peroxide.

[0012] In one of the embodiments, the flocculant dosing device is used for dosing polyacrylamide solution.

[0013] In one of the embodiments, the filtering device comprises a filter; and the filtered water production device comprises a filtered water tank.

[0014] In one of the embodiments, the filter is a multi-medium filter.

[0015] In one of the embodiments, the ozone generator comprises an oxygen generator system and an ozone generator.

[0016] In one of the embodiments, the oxygen generator system comprises a VPSA vacuum desorption oxygen generator.

[0017] The VPSA vacuum desorption oxygen generator adopts VPSA oxygen generation technology, and the working principle is as follows: under the condition of atmospheric pressure, the VPSA special molecular sieve selectively adsorbs nitrogen, carbon dioxide and water and other impurities in the air, and the molecular sieve is desorbed under vacuum, thereby cyclically producing oxygen with high purity. When the water treatment scale of the project is 45m 3 / h, the COD concentration is 815mg / L, the total oil concentration is 80mg / L, 2 oxygen generators are needed, the oxygen concentration is ≥90%, and the oxygen output of a single oxygen generator is 250m 3 / h.

[0018] The role of the above-mentioned ozone generator is to convert the oxygen delivered by the oxygen generator system into ozone in the ozone discharge chamber of the ozone generator through high-frequency high-voltage discharge. Under the above water quality and quantity conditions, 2 ozone generators are needed, the ozone concentration is ≥148mg / L, and the ozone output of a single ozone generator is 35kg / h.

[0019] In one of the embodiments, the oxidation device comprises a tail gas destroyer, an oxidation water production device, and N oxidation tower units.

[0020] In one of the embodiments, N≥1.

[0021] In one of the embodiments, N=3.

[0022] In one of the embodiments, the oxidation tower unit comprises an oxidation tower, a circulating pump, and a gas dissolving device, the oxidation tower is in communication with the tail gas destroyer, the oxidation tower is in communication with the gas dissolving device, and the circulating pump is arranged between the oxidation tower and the gas dissolving device.

[0023] In one of the embodiments, the oxidation tower units are in series communication.

[0024] In one embodiment, the oxidation tower is filled with a heterogeneous catalyst packing, and the oxidation tower in the Nth oxidation tower unit also has an oxidant.

[0025] The ozone production device, the oxidation device and the catalyst are sequentially connected, the catalyst is uniformly distributed in the oxidation tower, and the catalytic activity is high, so that the ozone catalytic reaction can occur in the oxidation tower, and the hydroxyl radicals with high oxidation-reduction potential are formed on the surface of the catalyst by the ozone; on the other hand, the oxidant added in the oxidation tower can form a synergistic effect with the ozone catalytic reaction to improve the oxidation efficiency, so that the P507 raffinate is efficiently deoiled and COD-removed.

[0026] In one embodiment, the oxidant includes at least one of hydrogen peroxide and sodium hypochlorite.

[0027] By adding the above-mentioned oxidant in the Nth oxidation tower, the ozone / Fenton-like or ozone / sodium hypochlorite synergistic effect is formed, compared with the traditional ozone catalytic oxidation device, the Fenton-like or sodium hypochlorite oxidation is introduced into the oxidation tower, and the effect of deoiling and COD-removing the P507 raffinate is more obvious, the COD removal rate can be > 65%, and the total oil removal rate can be > 75%.

[0028] The P507 raffinate deoiling and COD-removing system for the lithium battery industry of the present application is used to first discharge the P507 raffinate of the lithium battery industry into a pre-oxidation tank, sequentially add sodium hydroxide and hydrogen peroxide as the oxidant, adjust the pH value and pre-oxidize, oxidize organic phosphorus, sulfur ions and other substances to reduce the load of subsequent advanced oxidation, add a flocculant polyacrylamide solution (PAM for short) into the water after reaction, separate the precipitate in a sedimentation tank, filter the water in a multi-medium filter, and then enter an ozone catalytic oxidation tower, realize the synergistic intensification of ozone catalytic production of hydroxyl radicals and Fenton-like production of hydroxyl radicals or the synergistic intensification of ozone catalytic production of hydroxyl radicals and sodium hypochlorite, decompose oil and COD, and oxidize the water to enter an oxidation water tank.

[0029] Compared with the prior art, the P507 raffinate deoiling and COD-removing system has the following beneficial effects:

[0030] The P507 raffinate deoiling and COD-removing system can effectively remove oil and COD in the P507 raffinate of the lithium battery industry, does not need resin treatment, does not have Class A dangerous substances, and has low operation cost. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1The structural schematic diagram of the oil and COD removal system for P507 raffinate in the embodiment, wherein 11 is a pre-oxidation tank, 12 is a flocculation tank, 13 is a sedimentation tank, 14 is an intermediate water tank, 21 is a multi-medium filter, 22 is a filtered water tank, 31 is an oxygen generation system, 32 is an ozone generator, 41 is a dissolved air device, 42 is an oxidation tower, 43 is a tail gas destroyer, and 44 is an oxidation water tank. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0035] Source:

[0036] The reagents, materials and equipment used in the present embodiment are commercially available unless otherwise specified; the experimental methods are conventional experimental methods in the art unless otherwise specified.

[0037] EMBODIMENT

[0038] One kind of P507 raffinate oil removal COD removal system.

[0039] The system (as shown in Figure 1 ) includes a pretreatment system, a filtration system and an oxidation system connected in sequence.

[0040] The pretreatment system includes a pre-oxidation tank 11, a flocculation tank 12 and a sedimentation tank 13 connected in sequence; the pre-oxidation tank 11 is provided with a pre-oxidation agent dosing device for adding hydrogen peroxide and an alkali dosing device for adding sodium hydroxide solution; the flocculation tank 12 is provided with a flocculant dosing device for adding polyacrylamide solution; and the sedimentation tank 13 is provided with a sludge discharge system and an auxiliary sludge dewatering system.

[0041] The filtering system comprises a multi-medium filter 21, a filtered water tank 22 and a backwashing system connected in sequence.

[0042] The oxidation system comprises an oxygen generating system 31, an ozone generator 32 and an oxidation device connected in sequence.

[0043] In the embodiment, the oxygen generating system 31 adopts VPSA oxygen generating technology, i.e. a VPSA vacuum desorption oxygen generator. Under the condition of atmospheric pressure, nitrogen, carbon dioxide and water and other impurities in air are selectively adsorbed by VPSA special molecular sieve, and the molecular sieve is desorbed under vacuum, so that high-purity oxygen is cyclically generated. 3 Under the condition of the above water quality and quantity, two oxygen generators are matched, the oxygen concentration is 91%, and the oxygen output of a single oxygen generator is 250 m 3 / h.

[0044] The ozone generator 32 is used to convert the oxygen delivered by the oxygen generating system 31 into ozone in the ozone discharge chamber of the ozone generator 32 through high-frequency high-voltage discharge. Under the condition of the above water quality and quantity, two ozone generators 32 are matched, the ozone concentration is 150 mg / L, and the ozone output of a single ozone generator is 35 kg / h.

[0045] In the embodiment, the oxidation device comprises a tail gas destroyer 43, an oxidation water pool 44 and three oxidation tower units connected in series, wherein each oxidation tower unit comprises an oxidation tower 42, a circulating pump and a gas dissolving device 41. The oxidation tower in each oxidation tower unit is connected with the tail gas destroyer 43, and the oxidation tower is connected with the gas dissolving device 41, so that the fluid can circulate in the oxidation tower and the gas dissolving device 41. The circulating pump is arranged between the oxidation tower and the gas dissolving device 41.

[0046] In the embodiment, the oxidation tower is filled with heterogeneous high-efficiency catalyst filler, the catalyst is uniformly distributed, and the catalyst has high catalytic activity. The ozone forms hydroxyl radicals with high oxidation-reduction potential on the surface of the catalyst. In order to improve the oxidation efficiency, hydrogen peroxide or sodium hypochlorite is added in the third-stage oxidation tower to form ozone / Fenton or ozone / sodium hypochlorite synergistic effect.

[0047] II. Working principle of the P507 raffinate oil removal and COD removal system.

[0048] 1. Working principle.

[0049] When the P507 raffinate oil removal and COD removal system in lithium battery industry is used, the P507 raffinate in lithium battery industry is discharged into the pre-oxidation tank 11, sodium hydroxide and oxidant hydrogen peroxide are added in sequence to adjust pH and pre-oxidize, organic phosphorus, sulfur ions and other substances are oxidized to reduce the load of subsequent advanced oxidation, the effluent is added with flocculant polyacrylamide solution for reaction, and then enters the sedimentation tank 13 to separate the precipitate, and the effluent enters the multi-medium filter 21 for filtration and then enters the ozone catalytic oxidation tower, in which the synergistic effect of ozone / Fenton or ozone / sodium hypochlorite is realized to realize the synergistic intensification of ozone catalytic production of hydroxyl radicals and Fenton production of hydroxyl radicals or the synergistic intensification of ozone catalytic production of hydroxyl radicals and hypochlorite, and the oil and COD are decomposed, and the oxidized effluent enters the oxidation effluent tank 44.

[0050] 2. Advantageous effects.

[0051] Compared with the traditional oil removal technology, the P507 raffinate oil removal and COD removal system can effectively remove dissolved oil without resin equipment. Compared with the traditional ozone catalytic oxidation equipment, the Fenton or sodium hypochlorite oxidation is introduced into the oxidation tower, and the effect of P507 raffinate oil removal and COD removal is more obvious, the COD removal rate can be > 65%, and the total oil removal rate can be > 75%. The system can effectively remove oil and COD in P507 raffinate at the same time, has high removal efficiency, no Class A dangerous substances and low operation cost.

[0052] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered as the scope of the description.

[0053] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which are within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A P507 raffinate oil removal and COD removal system, characterized in that, The system comprises a pretreatment system, a filtering system and an oxidation system connected in sequence, the pretreatment system comprises a pre-oxidation device, a flocculation device and a sedimentation device connected in sequence, the filtering system comprises a filtering device, a filtering water production device and a backwashing system connected in sequence, and the oxidation system comprises an ozone generator and an oxidation device connected in sequence.

2. The P507 raffinate oil and COD removal system according to claim 1, characterized in that, The pre-oxidation device comprises a pre-oxidation tank provided with a pre-oxidant feeding device and an alkali feeding device.

3. The P507 raffinate deoiling and de-COD system of claim 1, wherein, The flocculation device comprises a flocculation tank provided with a flocculant feeding device. The sedimentation device comprises a sedimentation tank provided with a sludge discharge system and a sludge dewatering system.

4. The P507 raffinate deoiling and de-COD system of claim 1, wherein, The filtering device comprises a filter, and the filtering water production device comprises a filtering water production tank.

5. The P507 raffinate deoiling and de-COD system of claim 1, wherein, The ozone generator comprises an oxygen generator.

6. The P507 raffinate deoiling and de-COD system of claim 1, wherein, The oxidation device comprises a tail gas destroyer, an oxidation water production device and N oxidation tower units.

7. The P507 raffinate deoiling and de-COD system of claim 6, wherein, The oxidation tower unit comprises an oxidation tower, a circulating pump and a gas dissolving device, the oxidation tower is connected with the tail gas destroyer and the gas dissolving device, and the circulating pump is arranged between the oxidation tower and the gas dissolving device.

8. The P507 raffinate deoiling and de-COD system of claim 6, wherein, The oxidation tower units are connected in series.

9. The P507 raffinate deoiling and de-COD system of claim 6, wherein, The oxidation tower is filled with heterogeneous catalyst packing, and the oxidation tower in the Nth oxidation tower unit is further provided with an oxidant.

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