CN101544450A - Method for treating and recycling waste paper making wastewater - Google Patents
Method for treating and recycling waste paper making wastewater Download PDFInfo
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- CN101544450A CN101544450A CN200910098176A CN200910098176A CN101544450A CN 101544450 A CN101544450 A CN 101544450A CN 200910098176 A CN200910098176 A CN 200910098176A CN 200910098176 A CN200910098176 A CN 200910098176A CN 101544450 A CN101544450 A CN 101544450A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a method for treating and recycling waste paper making wastewater. The waste paper making wastewater enters a physicochemical treatment unit, crude fiber substances in the wastewater are intercepted by meshes of an inclined screen, and simultaneously fibers are reclaimed; then the wastewater enters an efficient sedimentation tank, a coagulation agent is added in a quick coagulation area of the efficient sedimentation tank, most suspended substances are removed through coagulation and inclined plate sedimentation, and a part of settled sludge reflows to the quick coagulation area; the yielded water of the efficient sedimentation tank flows into a sludge accommodating filter pool, and a part of the yielded water of the sludge accommodating filter pool is recycled; and the rest yielded water of the sludge accommodating filter pool enters a strengthening adsorption section of a biochemical treatment unit, a part of pollutants is adsorbed and absorbed by high-concentration sludge, then the yielded water enters an aerobic biochemical section and the pollutants are degraded by aerobic bacteria, the yielded water enters a sedimentation tank, a part of yielded water after sedimentation is recycled, and the rest processed water is discharged after reaching standards. The method adopts the efficient sedimentation tank to reduce the adding amount of agents and reduce anionic garbage in recycled sewage, and recycles sludge accommodating filtered water and biochemical treatment water twice to improve the recycling rate of the waste paper making wastewater.
Description
Technical field
The present invention relates to sewage treatment area, relate in particular to a kind of waste paper making wastewater and handle and recycling method.
Background technology
With adopting thallophyta fiber pulping and paper-making to compare, the contaminated wastewater that regenerated papermaking produces reduces greatly, but still considerably beyond emission standard.About 50% filler in the waste paper, 20% fiber fines and 95% printing ink enter in the waste water, and simultaneously, the adding of deinking agent has also increased the wastewater treatment difficulty to a certain extent.The common feature of waste paper making wastewater is non-solubility pollutant load height such as suspended substance, the solvability COD in its waste water, BOD index lower (chemical pulping relatively).
Pollutent in the papermaking wastewater roughly can be divided into three: 1, staple fibre, this part fiber refer to the fiber of length more than 0.2mm, its total amount is generally 0.5-1.5 ‰, and most papermaking enterprises have been noticed the recovery of staple fibre, but because method is simple, the rate of recovery is lower, and waste greatly.2, primitive fiber refers to the extremely short fiber between 0.2um～0.2mm in the staple length, and in the paper mill sludge that materialization is handled, the total amount of fento accounts for 85～90%, and fento may become short fiber and reclaims with the polymeric flocculant spreading, is the thing that valency is arranged; The total amount of fento in papermaking wastewater is about 0.4～0.5 ‰.3, mud and impurity, this is the part that really belongs to mud and impurity in the paper mill sludge, can not reuse or unserviceable account for 10～15%, these mud and impurity can only deal with in addition, generally can make anhydration and incineration and handle.
It mainly is slanted screen or filter that more micro-filtration treatment facility is adopted in present domestic paper mill.General each the factory's self design of slanted screen is compared the saving power consumption with filter, less investment, and its mesh is generally got 60～100 orders, and slanted screen filters and is adopted by most of middle-size and small-size paper mills at present.Adopt slanted screen, not only can purify liquid waste, can also collect the fiber fines in the waste water.Therefore, the closeer slanted screen mesh of mesh increases and area increases, and all helps the removal of SS in the waste water and the recycling of fiber fines.Reclaiming machine (ZL96216081.4) as the utility model patent waste paper fibre is exactly a technology that adopts the automatic recycled fiber of rotary screen.
Waste paper making wastewater is handled and is usually adopted the air supporting treatment technology, removes tiny fibre object by the coagulation air-float effect.Coagulated agent is based on iron system and aluminum-based metal salt, and the SS clearance can reach 85%～98%, and the CODCr clearance can reach 60%～80%.Increase more anionic trash but dosage is crossed conference, bad influence can be arranged the quality of copying paper.Therefore, adopting efficient sedimentation tank is the coagulative precipitation tank of quick coagulation and inclined plate sedimentation combination, and the reuse of partly precipitated mud promotes the part medicament to recycle, and reduces added amount of chemical.
Efficient sedimentation tank water outlet SS concentration is higher, carries out reuse after needing to filter.The principal element that influences filtering technique is a filtration medium, the filtration medium of current use mainly is particulate filter medium, the filamentary material of different qualities, both respectively have superiority, the particulate filter medium back flushing is easy, the filtration globality is better, but because the granule medium specific surface area is little, then filtering rate is little, and retaining power is little.And the fiber filter media specific surface area is big, appearance density is little, and then filtering rate is big, and retaining power is big, but the back flushing difficulty, trapped particles is deposited in the filtration medium surface easily, and droop loss is bigger, and the fibrous bundle loss is serious.And the advantage of comprehensive granule medium of snappiness protruded packing and filamentary material medium has filtering rate height, big, the easy characteristics of back flushing of holding filth capacity.
The paper waste biochemical treatment is many based on aerobic, also has the biochemical process of anaerobism (oxygen of holding concurrently) and aerobic combination.The aerobic process energy consumption is bigger separately, adopts anaerobic technique higher to the operating mode operating requirement, most of enterprise operation difficulty, and hold concurrently oxygen and aerobic process use comparatively extensive, and bio-chemical effluent can the part reuse.But the residence time of the oxygen of holding concurrently, generally more than a few hours, the biochemical residence time was longer.The activated sludge absorption technology is used more in municipal sewage plant's primary reinforcement treatment process, utilizes aerobic sludge backflow absorb polluted matter, can reduce the whole residence time of biochemical treatment unit, saves floor occupying area.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of waste paper making wastewater to handle and recycling method.
Waste paper making wastewater enters physicochemical treatment unit, utilizes the grid hole interception robust fibre thing of slanted screen, simultaneously recycled fiber; Enter efficient sedimentation tank then, quick coagulation district in efficient sedimentation tank adds coagulated agent, the quick coagulation district hydraulic detention time 9～12min of efficient sedimentation tank, remove most suspended substances by coagulation and inclined plate sedimentation, the inclined plate sedimentation surface load 15～18m/h of efficient sedimentation tank, partly precipitated mud is back to quick coagulation district; The efficient sedimentation tank water outlet enters receives dirty filter tank, receives dirty filter tank mainly to rely on filtrate to filter, and receives 60～70% reuses that dirty filter tank goes out water inventory; All the other are received the water outlet of dirty filter tank and enter the unitary reinforcement adsorption stage of biochemical treatment, utilize high concentration sludge absorption absorption portion pollutent, and the hydraulic detention time of strengthening adsorption stage is 12～20min, and the sludge concentration of strengthening adsorption stage is 6～8g/L; Strengthen the adsorption stage water outlet and enter the unitary aerobic biochemical section of biochemical treatment, the hydraulic detention time of aerobic biochemical section is 7.2～9.1h, and sludge concentration is 3～4g/L, dissolved oxygen is 2～4mg/L, the water outlet of aerobic biochemical section enters settling tank, and sedimentation time is 1.5～2h, and surface load is 0.8～1.0m
3/ m
2.h, through 60～70% reuses that post precipitation goes out water inventory, all the other treating water qualified discharges: strengthen adsorption stage mud through after precipitating concentrated and sludge activation, be back to and strengthen the adsorption stage absorb polluted matter, settling tank part mud is back to aerobic section, and excess sludge is through the outward transport of dehydration back.
Described slanted screen size of mesh opening 100～120 orders.Coagulated agent is a polymerize aluminum chloride, and the dosage of coagulated agent is 10～25mg/L.The dirty filter tank filtering velocity of receiving is 30～35m/h.Filtrate is the snappiness protruded packing.
The beneficial effect that the present invention compared with prior art has:
1) the present invention adopts efficient sedimentation tank, reduces added amount of chemical, reduces the anionic trash of reusing sewage;
2) the present invention adopts and to receive dirty water outlet and twice reusing sewage of biochemical treatment water outlet of filtering, and has improved the reclamation rate of waste paper making wastewater, and a ton paper water consumption can drop to 10 tons of water/below the ton paper;
3) receiving dirty filter tank filtering velocity more than 30m/h among the present invention, is more than 5 times of conventional rapid filter, saves a large amount of floor spaces;
4) by the enhanced biological adsorption, can reduce the concentration of water pollutant rapidly, reduce the biochemical treatment time, reduce aeration time, efficient, energy-conservation, province ground.
Description of drawings
Accompanying drawing is the process flow sheet of waste paper making wastewater processing and recycling method.
Embodiment
For better understanding the present invention, below to efficient sedimentation tank, receive dirty filter tank and the unitary reinforcement adsorption stage of biochemical treatment and be elaborated.
Efficient sedimentation tank
It is to remove suspended substance that efficient sedimentation tank mainly acts on, and is made up of coagulating and sloping plate deposition.Coagulated agent is from medicament in the settling tank returned sluge and the medicament of adding, mixing with waste paper making wastewater in the coagulation district fast, can reduce coagulant charging quantity, also provide the nucleation unit for coagulating, the time weak point that alumen ustum forms and grows up, the alumen ustum of growing up is after the settling region rapid precipitation, the precipitating sludge precipitation also concentrates, partial reflux is to quick coagulation district, all the other mud carry out fiber recovery, after precipitation part was removed suspended substance by swash plate, the waste paper making wastewater of processing enters received dirty filter tank.
Receive dirty filter tank
Receiving that dirty filter tank mainly acts on is to remove the lightweight suspension thing, improves reusing sewage water quality.Receive dirty filter tank and utilize the snappiness protruded packing, utilize the Depth Filtration principle, hold back the impurity in the sewage as filtrate.Because snappiness protruded packing voidage height, pollutant holding capability is big, can reduce the back flushing frequency.Snappiness cellular polyurethane filler component is: polyester polyol 86 weight parts, polymer polyatomic alcohol 10 weight parts, isocyanic ester 82 weight parts, water 3 weight parts, catalyzer 0.3 weight part, whipping agent 5 weight parts, suds-stabilizing agent 2 weight parts.Catalyzer is stannous octoate and dimethyl benzylamine, and whipping agent is water and fluoro trichloromethane, and suds-stabilizing agent is a silicone oil 580.
The unitary reinforcement adsorption stage of biochemical treatment
It is to remove organic pollutant that the unitary reinforcement adsorption stage of biochemical treatment mainly acts on.It is to adopt the process that refluxes through spissated activated sludge absorption, absorption pollutent.Sludge activation is to make the microorganism in the mud be in starvation through spissated active sludge by aeration, for the sludge absorption pollutent provides condition.
Embodiment 1:
COD
CrBe 1120mg/L, BOD
5Be 340mg/L, SS is that the waste paper making wastewater of 960mg/L enters physicochemical treatment unit, utilizes the grid hole interception robust fibre thing of slanted screen, the while recycled fiber, and size of mesh opening is 120 orders; The slanted screen water outlet enters efficient sedimentation tank, adds the coagulated agent polymerize aluminum chloride, and the dosage of coagulated agent is 10mg/L, removes most suspended substances by coagulation and inclined-plate clarifying basin, and wherein the coagulation time is 9min, and the inclined-plate clarifying basin surface load is 18m/h; The efficient sedimentation tank water outlet enters receives dirty filter tank, receives dirty filter tank mainly to rely on filtrate to filter, and receives dirty filter tank filtering velocity 30m/h, receives 70% reuse that dirty filter tank goes out water inventory; All the other are received the water outlet of dirty filter tank and enter the unitary reinforcement adsorption stage of biochemical treatment, utilize high concentration sludge absorption absorption portion pollutent, and the hydraulic detention time of strengthening adsorption stage is 15 minutes, and the sludge concentration of strengthening adsorption stage is 6g/L; Strengthen the adsorption stage water outlet and enter the unitary aerobic biochemical section of biochemical treatment, the hydraulic detention time of aerobic biochemical section is 7.2 hours, and sludge concentration is 3g/L, dissolved oxygen is 2mg/L, the water outlet of aerobic biochemical section enters settling tank, and sedimentation time is 1.5 hours, and surface load is 0.8m
3/ m
2.h, through 70% reuse that post precipitation goes out water inventory, strengthen adsorption stage mud through after precipitating concentrated and sludge activation, be back to and strengthen the adsorption stage absorb polluted matter, settling tank part mud is back to aerobic section, and excess sludge is through the outward transport of dehydration back, all the other treating water qualified discharges.
Embodiment 2:
COD
CrBe 3458mg/L, BOD
5Be 680mg/L, SS is that the waste paper making wastewater of 3000mg/L enters physicochemical treatment unit, utilizes the grid hole interception robust fibre thing of slanted screen, the while recycled fiber, and size of mesh opening is 100 orders; The slanted screen water outlet enters efficient sedimentation tank, adds the coagulated agent polymerize aluminum chloride, and the dosage of coagulated agent is 25mg/L, removes most suspended substances by coagulation and inclined-plate clarifying basin, and wherein the coagulation time is 12min, and the inclined-plate clarifying basin surface load is 15m/h; The efficient sedimentation tank water outlet enters receives dirty filter tank, receives dirty filter tank mainly to rely on filtrate to filter, and receives dirty filter tank filtering velocity 35m/h, receives 60% reuse that dirty filter tank goes out water inventory; All the other are received the water outlet of dirty filter tank and enter the unitary reinforcement adsorption stage of biochemical treatment, utilize high concentration sludge absorption absorption portion pollutent, and the hydraulic detention time of strengthening adsorption stage is 12 minutes, and the sludge concentration of strengthening adsorption stage is 8g/L; Strengthen the adsorption stage water outlet and enter the unitary aerobic biochemical section of biochemical treatment, the hydraulic detention time of aerobic biochemical section is 9.1 hours, and sludge concentration is 4g/L, dissolved oxygen is 3mg/L, the water outlet of aerobic biochemical section enters settling tank, and sedimentation time is 2.0 hours, and surface load is 1.0m
3/ m
2.h, through 60% reuse that post precipitation goes out water inventory, strengthen adsorption stage mud through after precipitating concentrated and sludge activation, be back to and strengthen the adsorption stage absorb polluted matter, settling tank part mud is back to aerobic section, and excess sludge is through the outward transport of dehydration back, all the other treating water qualified discharges.
Embodiment 3:
COD
CrBe 2373mg/L, BOD
5Be 540mg/L, SS is that the waste paper making wastewater of 1800mg/L enters physicochemical treatment unit, utilizes the grid hole interception robust fibre thing of slanted screen, the while recycled fiber, and size of mesh opening is 110 orders; The slanted screen water outlet enters efficient sedimentation tank, adds the coagulated agent polymerize aluminum chloride, and the dosage of coagulated agent is 13mg/L, removes most suspended substances by coagulation and inclined-plate clarifying basin, and wherein the coagulation time is 12min, and the inclined-plate clarifying basin surface load is 16m/h; The efficient sedimentation tank water outlet enters receives dirty filter tank, receives dirty filter tank mainly to rely on filtrate to filter, and receives dirty filter tank filtering velocity 34m/h, receives 60% reuse that dirty filter tank goes out water inventory; All the other are received the water outlet of dirty filter tank and enter the unitary reinforcement adsorption stage of biochemical treatment, utilize high concentration sludge absorption absorption portion pollutent, and the hydraulic detention time of strengthening adsorption stage is 20 minutes, and the sludge concentration of strengthening adsorption stage is 7g/L; Strengthen the adsorption stage water outlet and enter the unitary aerobic biochemical section of biochemical treatment, the hydraulic detention time of aerobic biochemical section is 8.7 hours, and sludge concentration is 4g/L, dissolved oxygen is 4mg/L, the water outlet of aerobic biochemical section enters settling tank, and sedimentation time is 2.0 hours, and surface load is 1.0m
3/ m
2.h, through 60% reuse that post precipitation goes out water inventory, strengthen adsorption stage mud through after precipitating concentrated and sludge activation, be back to and strengthen the adsorption stage absorb polluted matter, settling tank part mud is back to aerobic section, and excess sludge is through the outward transport of dehydration back, all the other treating water qualified discharges.
Embodiment 4:
COD
CrBe 1876mg/L, BOD
5Be 470mg/L, SS be 1240mg/L waste paper making wastewater enter physicochemical treatment unit, utilize the grid hole interception robust fibre thing of slanted screen, recycled fiber simultaneously, size of mesh opening is 110 orders; The slanted screen water outlet enters efficient sedimentation tank, adds the coagulated agent polymerize aluminum chloride, and the dosage of coagulated agent is 15mg/L, removes most suspended substances by coagulation and inclined-plate clarifying basin, and wherein the coagulation time is 10min, and the inclined-plate clarifying basin surface load is 18m/h; The efficient sedimentation tank water outlet enters receives dirty filter tank, receives dirty filter tank mainly to rely on filtrate to filter, and receives dirty filter tank filtering velocity 32m/h, receives 70% reuse that dirty filter tank goes out water inventory; All the other are received the water outlet of dirty filter tank and enter the unitary reinforcement adsorption stage of biochemical treatment, utilize high concentration sludge absorption absorption portion pollutent, and the hydraulic detention time of strengthening adsorption stage is 17 minutes, and the sludge concentration of strengthening adsorption stage is 7g/L; Strengthen the adsorption stage water outlet and enter the unitary aerobic biochemical section of biochemical treatment, the hydraulic detention time of aerobic biochemical section is 8.4 hours, and sludge concentration is 3g/L, dissolved oxygen is 2mg/L, the water outlet of aerobic biochemical section enters settling tank, and sedimentation time is 1.5 hours, and surface load is 0.8m
3/ m
2.h, through 70% reuse that post precipitation goes out water inventory, strengthen adsorption stage mud through after precipitating concentrated and sludge activation, be back to and strengthen the adsorption stage absorb polluted matter, settling tank part mud is back to aerobic section, and excess sludge is through the outward transport of dehydration back, all the other treating water qualified discharges.
Claims (5)
1. a waste paper making wastewater is handled and recycling method, it is characterized in that waste paper making wastewater enters physicochemical treatment unit, utilizes the grid hole interception robust fibre thing of slanted screen, simultaneously recycled fiber; Enter efficient sedimentation tank then, quick coagulation district in efficient sedimentation tank adds coagulated agent, quick coagulation district hydraulic detention time 9～12min, remove most suspended substances by coagulation and inclined plate sedimentation, inclined plate sedimentation surface load 15～18m/h, partly precipitated mud are back to quick coagulation district; The efficient sedimentation tank water outlet enters receives dirty filter tank, receives dirty filter tank mainly to rely on filtrate to filter, and receives 60～70% reuses that dirty filter tank goes out water inventory; All the other are received the water outlet of dirty filter tank and enter the unitary reinforcement adsorption stage of biochemical treatment, utilize high concentration sludge absorption absorption portion pollutent, and the hydraulic detention time of strengthening adsorption stage is 12～20min, and the sludge concentration of strengthening adsorption stage is 6～8g/L; Strengthen the adsorption stage water outlet and enter the unitary aerobic biochemical section of biochemical treatment, the hydraulic detention time of aerobic biochemical section is 7.2～9.1h, and sludge concentration is 3～4g/L, dissolved oxygen is 2～4mg/L, the water outlet of aerobic biochemical section enters settling tank, and sedimentation time is 1.5～2h, and surface load is 0.8～1.0m
3/ m
2.h, through 60～70% reuses that post precipitation goes out water inventory, all the other treating water qualified discharges: strengthen adsorption stage mud through after precipitating concentrated and sludge activation, be back to and strengthen the adsorption stage absorb polluted matter, settling tank part mud is back to aerobic section, and excess sludge is through the outward transport of dehydration back.
2. a kind of waste paper making wastewater according to claim 1 is handled and recycling method, it is characterized in that described slanted screen size of mesh opening 100～120 orders.
3. a kind of waste paper making wastewater according to claim 1 is handled and recycling method, it is characterized in that described coagulated agent is a polymerize aluminum chloride, and the dosage of coagulated agent is 10～25mg/L.
4. a kind of waste paper making wastewater according to claim 1 is handled and recycling method, it is characterized in that the described dirty filter tank filtering velocity of receiving is 30～35m/h.
5. a kind of waste paper making wastewater according to claim 1 is handled and recycling method, it is characterized in that described filtrate is the snappiness protruded packing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100981764A CN101544450B (en) | 2009-05-05 | 2009-05-05 | Method for treating and recycling waste paper making wastewater |
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| CN2009100981764A CN101544450B (en) | 2009-05-05 | 2009-05-05 | Method for treating and recycling waste paper making wastewater |
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| CN101544450A true CN101544450A (en) | 2009-09-30 |
| CN101544450B CN101544450B (en) | 2011-03-02 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102174584A (en) * | 2011-01-28 | 2011-09-07 | 华南理工大学 | Combined biological hydrogen production method by adopting sludge and fibers of recovered waste paper |
| CN102939267A (en) * | 2010-05-28 | 2013-02-20 | 艺康美国股份有限公司 | Improvement of activated sludge process in wastewater treatment |
| CN103011502A (en) * | 2012-12-05 | 2013-04-03 | 浙江理工大学 | Method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using ultrafiltration membrane |
| CN103964613A (en) * | 2014-05-27 | 2014-08-06 | 浙江华川实业集团有限公司 | Wastewater treatment process for paper mill |
| CN103964653A (en) * | 2014-05-27 | 2014-08-06 | 浙江华川实业集团有限公司 | Wastewater recovery processing process of paper mill |
| CN108298772A (en) * | 2017-09-08 | 2018-07-20 | 安徽玄同工业设计有限公司 | A kind of processing method for papermaking wastewater |
| CN114105356A (en) * | 2021-11-18 | 2022-03-01 | 中国轻工业长沙工程有限公司 | Deep treatment process for papermaking by using waste paper |
| CN114890564A (en) * | 2022-05-09 | 2022-08-12 | 广东前进牛仔布有限公司 | Recovery method of denim fabric desizing wastewater |
-
2009
- 2009-05-05 CN CN2009100981764A patent/CN101544450B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102939267A (en) * | 2010-05-28 | 2013-02-20 | 艺康美国股份有限公司 | Improvement of activated sludge process in wastewater treatment |
| CN102174584A (en) * | 2011-01-28 | 2011-09-07 | 华南理工大学 | Combined biological hydrogen production method by adopting sludge and fibers of recovered waste paper |
| CN103011502A (en) * | 2012-12-05 | 2013-04-03 | 浙江理工大学 | Method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using ultrafiltration membrane |
| CN103011502B (en) * | 2012-12-05 | 2014-06-18 | 浙江理工大学 | Method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using ultrafiltration membrane |
| CN103964613A (en) * | 2014-05-27 | 2014-08-06 | 浙江华川实业集团有限公司 | Wastewater treatment process for paper mill |
| CN103964653A (en) * | 2014-05-27 | 2014-08-06 | 浙江华川实业集团有限公司 | Wastewater recovery processing process of paper mill |
| CN103964653B (en) * | 2014-05-27 | 2016-06-08 | 浙江华川实业集团有限公司 | A kind of waste water of paper mill recovery processing technique |
| CN108298772A (en) * | 2017-09-08 | 2018-07-20 | 安徽玄同工业设计有限公司 | A kind of processing method for papermaking wastewater |
| CN114105356A (en) * | 2021-11-18 | 2022-03-01 | 中国轻工业长沙工程有限公司 | Deep treatment process for papermaking by using waste paper |
| CN114105356B (en) * | 2021-11-18 | 2024-02-06 | 中国轻工业长沙工程有限公司 | Advanced treatment process for waste paper making |
| CN114890564A (en) * | 2022-05-09 | 2022-08-12 | 广东前进牛仔布有限公司 | Recovery method of denim fabric desizing wastewater |
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