CN115093000A - Viscose fiber wastewater quality-based treatment method - Google Patents
Viscose fiber wastewater quality-based treatment method Download PDFInfo
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Abstract
The invention provides a viscose fiber wastewater quality-divided treatment method, which is characterized in that viscose fiber wastewater is divided into discharge wastewater and reclaimed water reuse raw water, the discharge wastewater is divided into high-concentration acid-base wastewater and medium-concentration acid-base wastewater, the discharge wastewater is subjected to physicochemical pretreatment respectively, and then is combined and subjected to subsequent biochemical treatment, advanced oxidation and advanced purification treatment, and then is discharged, and the reclaimed water reuse raw water is recycled to a soft water station after being subjected to neutralization regulation, air flotation, high-density precipitation, advanced oxidation and advanced purification treatment. The invention can reduce the investment cost and the operation cost of water treatment and improve the utilization rate of water resources.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a viscose waste water quality-based treatment method.
Background
Viscose fiber is a long-history chemical fiber, and is prepared by using natural fiber (wood fiber and cotton linter) as a raw material, preparing soluble cellulose sulfonate through the processes of alkalization, aging, sulfonation and the like, dissolving the soluble cellulose sulfonate in dilute alkali liquor to prepare viscose, and performing wet spinning. NaOH and CS are added in the production process of viscose fiber 2 、H 2 SO 4 、ZnSO 4 Chemical agents, etc., causing itThe pollutant content of the wastewater is complex.
In general, viscose waste water is divided into two categories: acidic wastewater and alkaline wastewater. The method comprises the following steps of (1) fully mixing various waste water such as plasticizing bath overflow water, washing spinning machine water, filter backwashing waste water, degassing condensed water and post-treatment pickling water of an acid station, secondary steam condensed water generated in an evaporation process, deacidifying water of a waste gas treatment station and the like in an acid waste water regulating tank; viscose water tank and equipment washing water and filter cloth washing water in a stock solution workshop, spinning alkaline wastewater, refining washing wastewater and post-treated desulfurization wastewater in a spinning workshop, sewage discharged by a waste gas washing tower and other various wastewater are fully mixed in an alkaline wastewater adjusting tank and then enter a viscose fiber production wastewater treatment process.
The existing viscose fiber production wastewater treatment process generally comprises physicochemical pretreatment, biochemical treatment, advanced oxidation and active sand filtration: the materialization pretreatment comprises mixing acidic and alkaline wastewater, adjusting pH, acidifying, resolving and air-floating to remove cellulose, SS and the like; removing sulfides and the like by aeration stripping; adding lime milk to neutralize and remove metal zinc ions; after precipitation, biochemical treatment, advanced oxidation and active sand filtration treatment are carried out. Wherein the advanced oxidation can also be used for front-end materialization pretreatment.
The concentration of calcium sulfate in effluent discharged by the existing wastewater treatment process is high, and if reclaimed water is recycled, the process of multi-medium filtration, ultrafiltration and reverse osmosis is adopted, so that the equipment investment cost is high; the high-concentration calcium sulfate not only reduces the reuse rate, but also causes the scaling of the reverse osmosis membrane, and has high operation and maintenance cost. Therefore, the production wastewater in the viscose industry is directly discharged after being treated at present, and reclaimed water is not recycled.
Chinese patent CN 201811408812.4 proposes a viscose fiber wastewater treatment process, wherein acidic wastewater enters an acidic adjusting tank, alkaline wastewater enters an alkaline adjusting tank, and then the acidic wastewater respectively passes through a primary blending tank, a shallow air flotation tank, a secondary blending tank, a secondary sedimentation tank, a coagulation reaction tank, a tertiary sedimentation tank, an adjusting tank, a cooling tower, an aerobic biochemical tank, an aerobic sedimentation tank, an intermediate water tank, a catalytic oxidation reaction tank, a dewatering tank, a neutralization tank, a flocculation reaction tank, a sand filtration lifting tank and an active sand filter, and the treated wastewater can reach the primary A standard in pollutant discharge Standard of urban sewage treatment plant (GB18918-2002) through the comprehensive treatment. Chinese patent CN 201910838045.9 proposes another viscose wastewater treatment process, in which acidic wastewater and alkaline viscose wastewater enter a regulating tank to be fully mixed and aerated, and then are subjected to air flotation treatment, micro-electrolysis treatment, catalytic oxidation treatment, neutralization and precipitation treatment, aerobic biochemical treatment and precipitation treatment, and the process is characterized in that: the micro-electrolysis treatment is to send the wastewater into a micro-electrolysis reactor to oxidize and remove complex organic matters with strong degradation-resistant stability in the wastewater, so as to remove chromaticity and heavy metals; and (3) feeding the electrolyzed wastewater into a catalytic oxidation reactor, adding hydrogen peroxide as an oxidant, and further oxidizing and removing the organic matters which are difficult to degrade. But the materialization pretreatment has weak pertinence, so that the treatment effect is poor, the pollutant discharge amount is large, and the system operation cost is high.
Chinese patent CN 201820086053.3 proposes a high-purity wastewater treatment and reclaimed water recycling system in the non-viscose fiber industry, wherein a wastewater system subdivides nickel-containing wastewater, the nickel-containing wastewater enters a comprehensive wastewater adjusting tank after physicochemical pretreatment, the comprehensive wastewater passes through a first PAC reaction tank, a first PAM reaction tank, a first sedimentation tank, a first pH (potential of Hydrogen) callback tank, a flocculation tank, a second sedimentation tank, an oxidation tank, an intermediate tank, an anaerobic tank, a first-stage anoxic tank, a first-stage aerobic tank, a second-stage anoxic tank, a second-stage aerobic tank, a sedimentation tank, a clean water tank and a sand filtration tank, and the standard-reaching water tank is sequentially communicated with a first booster lift pump, a quartz sand filter, an activated carbon filter, a first bag filter, an ultrafiltration membrane filter, a water tank, a second booster lift pump, a second bag filter, a high-pressure pump, a reverse osmosis device and a recycling water tank. But the construction investment cost is high, the waste water operation cost is high, and the water resource utilization rate is low.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a viscose waste water quality-based treatment method, which can reduce the water treatment operation cost and improve the water resource utilization rate.
The invention provides a viscose fiber wastewater quality-based treatment method, which is suitable for wastewater generated in the viscose fiber production process, and comprises pretreatment, wherein the pretreatment comprises the following steps:
step 1, dividing the wastewater into acidic wastewater and alkaline wastewater, wherein the acidic wastewater comprises high-concentration acidic wastewater and medium-concentration acidic wastewater, the pH value of the high-concentration acidic wastewater is lower than that of the medium-concentration acidic wastewater, the alkaline wastewater comprises high-concentration alkaline wastewater and medium-concentration alkaline wastewater, and the pH value of the high-concentration alkaline wastewater is higher than that of the medium-concentration alkaline wastewater;
and 3, mixing the solutions subjected to the physicochemical pretreatment in the step 2 respectively.
Preferably: the index content of the acidic pollutants in the high-concentration acidic wastewater in the step 1 is greater than the index content of the acidic pollutants in the medium-concentration acidic wastewater.
And preferably the index content of the acidic pollutants comprises COD content and Zn content 2+ Content, TDS.
Preferably: the index content of the alkaline pollutants in the high-concentration alkaline wastewater in the step 1 is greater than that of the medium-concentration alkaline wastewater.
And preferably the index content of alkaline contaminants includes COD content and/or S 2- And (4) content.
Preferably: and the operation of high-concentration materialization pretreatment in the step 2 comprises acidification and resolution, air stripping, air flotation, neutralization and regulation, flocculation and precipitation.
Preferably, the following components: the operation of the medium concentration pretreatment in the step 2 comprises acidification and desorption, air flotation, neutralization and adjustment, flocculation and precipitation.
Preferably: further comprising:
and 4, sequentially carrying out biochemical treatment, advanced oxidation treatment and deep purification treatment on the solution mixed in the step 3.
Preferably, the following components: the step 1 further comprises:
step 1.1, dividing the wastewater into discharge wastewater and reclaimed water reuse raw water, wherein the water quality index of the reclaimed water reuse raw water is less than that of the discharge wastewater;
and 1.2, dividing the discharged wastewater into acidic wastewater and alkaline wastewater.
Preferably, the following components: the water quality index comprises at least one of COD content, TDS content and hardness index content.
Preferably: and the step 2 also comprises the step of recycling the reclaimed water recycled raw water after purification treatment.
Preferably, the following components: the operation of the purification treatment in the step 2 comprises neutralization and adjustment, air floatation, precipitation, oxidation and filtration.
The viscose fiber wastewater quality-based treatment method disclosed by the invention can greatly optimize the treatment effect, reduce the investment cost and the wastewater operating cost, improve the water resource utilization rate and realize the purposes of energy conservation and emission reduction.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic process flow diagram of wastewater treatment according to an embodiment of the present invention;
FIG. 2 is a schematic process flow diagram of the physicochemical pretreatment of high-concentration acid-base wastewater according to the embodiment of the invention;
FIG. 3 is a schematic process flow diagram of the physicochemical pretreatment of concentrated acid-base wastewater in an example of the present invention;
FIG. 4 is a schematic view of a subsequent process flow for the physicochemical pretreatment of discharged wastewater according to an embodiment of the present invention;
FIG. 5 is a schematic flow diagram of a process for water reuse treatment in an embodiment of the present invention;
FIG. 6 is a schematic process flow diagram of sludge treatment according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
Under the condition that does not adopt branch matter to handle, current sewage treatment system construction investment cost is high, and waste water working costs is high, and water resource utilization is low, and waste water pollutant emission is big, specifically exists following problem:
1. the viscose fiber production wastewater is of various types, is divided into acid wastewater and alkaline wastewater only according to acidity and alkalinity, does not consider the factors of wide range of wastewater acidity and alkalinity, large difference of pollutant index content and the like, and has weak pertinence during physicochemical pretreatment. Although the equipment operation parameters are set greatly, the dosage of the medicament is large, the treatment effect is poor, and further a subsequent biochemical and advanced oxidation system is influenced, so that the discharge amount of the discharged water pollutants is large, and the system operation cost is high.
2. The water content of waste gas treatment deacidification water, acid station secondary steam condensate water and the like is large, the pollutant concentration is very low, and the waste gas treatment deacidification water and the acid station secondary steam condensate water can be used as reclaimed water reuse raw water. If the wastewater is treated according to the wastewater process, the operation cost of a wastewater system is increased, and the utilization rate of water resources is low.
3. The treatment process is designed according to the indexes of high-concentration pollutants and the large wastewater treatment capacity, so that the volumes of buildings and structures are increased, the capital investment cost is inevitably increased, and the occupied area is increased.
As shown in fig. 1, in the embodiment of the present invention, a method for treating waste water of viscose fiber by different qualities is provided, which is suitable for waste water generated in the production process of viscose fiber, including physicochemical pretreatment before biochemical treatment, oxidation and the like of waste water.
First, an embodiment of the present invention includes separating wastewater into discharge wastewater and reclaimed raw water.
The discharged wastewater is divided into high-concentration acid-base wastewater and medium-concentration acid-base wastewater, and is subjected to physicochemical pretreatment, combination and subsequent treatment of biochemical treatment, advanced oxidation and deep purification, and then is discharged.
The reclaimed water reuse raw water is recycled to a soft water station after being treated by the processes of neutralization regulation, air flotation, high-density precipitation, advanced oxidation and deep purification.
Wherein, the water quality index of the raw water for reclaimed water reuse is less than the water quality index of the discharged wastewater. The embodiment of the invention selects the wastewater with the index close to that of soft water, and uses the wastewater as the reclaimed water for reusing the raw water, thereby reducing the operation cost of a wastewater system and improving the utilization rate of water resources.
Secondly, the pretreatment of the discharged wastewater specifically comprises the following steps:
step 1, dividing the waste water into acidic waste water and alkaline waste water.
The acidic wastewater comprises high-concentration acidic wastewater (which can be named as first acidic wastewater) and medium-concentration acidic wastewater (which can be named as second acidic wastewater), and the pH value of the high-concentration acidic wastewater is lower than that of the medium-concentration acidic wastewater.
The alkaline wastewater comprises high-concentration alkaline wastewater (which can be named as first alkaline wastewater) and medium-concentration alkaline wastewater (which can be named as second alkaline wastewater), and the pH value of the high-concentration alkaline wastewater is higher than that of the medium-concentration alkaline wastewater.
In order to solve the problems that viscose waste water classification is simple, the pH value range of waste water is wide, and the index content difference of pollutants is large, the embodiment of the invention arranges the classification collecting tanks of the waste water of different qualities in each production workshop: the high-concentration acidic wastewater collecting tank, the high-concentration alkaline wastewater collecting tank, the medium-concentration acidic wastewater collecting tank and the medium-concentration alkaline wastewater collecting tank are arranged and are respectively provided with an independent pipeline to be conveyed to the corresponding wastewater adjusting tank.
After detecting the wastewater generated in the viscose fiber production process, the embodiment of the invention finds that in general, the lower the pH value of the acidic wastewater is, the higher the index content of the acidic pollutants is; the higher the pH value in the alkaline wastewater, the higher the index content of alkaline pollutants. The pH value can well distinguish the index content of pollutants in the wastewater, and the quality is classified according to the pH value, so that the later physicochemical pretreatment is facilitated. And by combining with specific pollutant index content, the wastewater with wide alkalinity range and large pollutant index content difference is subjected to quality-divided treatment, so that the pertinence in the physicochemical pretreatment can be improved, and the operation efficiency of a wastewater system can be improved.
In the embodiment of the invention, the pH value of the high-concentration acidic wastewater is preferably less than or equal to 3, and the pH value of the medium-concentration acidic wastewater is more than 3; the pH value of the high-concentration alkaline wastewater is more than or equal to 11, and the pH value of the medium-concentration alkaline wastewater is less than 11.
Further preferably, the pH value of the high-concentration acidic wastewater is 1-3, and the pH value of the medium-concentration acidic wastewater is 4-6; the pH value of the high-concentration alkaline wastewater is 11-13, and the pH value of the medium-concentration alkaline wastewater is 8-10.
Furthermore, in embodiments of the present invention, the preferred classification criteria are also integrated with reference contaminant index levels.
Preferably, the index content of the acidic pollutants of the high-concentration acidic wastewater is greater than that of the acidic pollutants of the medium-concentration acidic wastewater, and further preferably, the index content of the acidic pollutants comprises COD (chemical oxygen demand) content and Zn (zinc) 2+ Content, TDS.
Preferably, the index content of the alkaline pollutants of the high-concentration alkaline wastewater is greater than that of the medium-concentration alkaline wastewater, and further preferably, the index content of the alkaline pollutants comprises COD content and/or S 2- And (4) content.
The embodiment of the invention is suitable for the wastewater generated in the viscose fiber production process.
The viscose fiber production process comprises stock solution workshops, acid stations, spinning, waste gas treatment and other workshop or processes, wherein various waste water is generated in each waste water generation workshop section.
The embodiment of the invention combines the pH value, COD and Zn of the wastewater according to different production steps 2+ The acidic wastewater is divided into high-concentration acidic wastewater and medium-concentration acidic wastewater by using pollutant numerical values with large changes such as TDS (total dissolved solids); according to different production steps and combining the pH value, COD and S of the wastewater 2- And TDS and the like, and the alkaline wastewater is divided into high-concentration and medium-concentration alkaline wastewater.
The specific qualities according to the different production steps are shown in the following table 1:
table 1: quality classification table of production steps
The embodiment of the invention combines the viscose fiber production process, and classifies different waste water generated by each waste water generation section into high-concentration acidic waste water, high-concentration alkaline waste water, medium-concentration acidic waste water and medium-concentration alkaline waste water according to the pH value and the pollutant content index, thereby solving the problems of simple classification of the viscose fiber waste water, wide range of the pH value of the waste water and large difference of the pollutant index content.
And 2, mixing the high-concentration acidic wastewater and the high-concentration alkaline wastewater to perform high-concentration materialization pretreatment (which can be named as first materialization pretreatment), and mixing the medium-concentration acidic wastewater and the medium-concentration alkaline wastewater to perform medium-concentration materialization pretreatment (which can be named as second materialization pretreatment).
The physicochemical pretreatment of the sewage treatment process adopts high-concentration and medium-concentration wastewater quality-divided pretreatment.
Preferably, the step of mixing the high-concentration acidic wastewater with the high-concentration alkaline wastewater (namely, the high-concentration wastewater) to perform physicochemical pretreatment comprises acidification and desorption, air stripping, air flotation, neutralization and regulation, flocculation and precipitation.
Adjusting the pH value to 2-3 by adding sulfuric acid in acidification and resolution, separating out and removing cellulose from wastewater, and removing S by air stripping 2- The air floatation forms highly dispersed micro bubbles in water, solid or liquid particles of hydrophobic groups in the wastewater are adhered to form a water-gas-particle three-phase mixed system, and after the bubbles are adhered to the particles, flocs with apparent density smaller than that of the water are formed and float to the water surface, and a scum layer is formed and scraped, so that the process of separating solid from liquid or separating liquid from liquid is realized.
Then adding alkali for neutralization to adjust the pH value to 7-8 to remove Zn 2+ The suspended particles in water or liquid are gathered and enlarged or form floccules through flocculation, thereby accelerating the coagulation of the particles and achieving the aim of solid-liquid separation; then precipitating and discharging the sludge.
As shown in fig. 2, in the embodiment of the present invention, the wastewater in the high concentration acidic wastewater adjusting tank and the wastewater in the high concentration alkaline wastewater adjusting tank are mixed, then subjected to acid precipitation and stripping, and then enter the air flotation tank, and as shown in fig. 6, the slag discharged from the air flotation tank enters the scum tank, the wastewater enters the neutralization adjusting tank, then enters the coagulation reaction tank, finally enters the primary sedimentation tank, and as shown in fig. 6, the sludge discharged enters the sludge concentration tank, and the wastewater enters the next subsequent treatment.
And preferably, the step of mixing the medium-concentration acidic wastewater and the medium-concentration alkaline wastewater (namely, the medium-concentration wastewater) for physicochemical pretreatment comprises acidification and desorption, air flotation, neutralization and regulation, flocculation and precipitation.
S in medium-concentration wastewater 2- Low content of (A), so that no separate stripping cell is set up, and a small amount of H 2 S、CS 2 And the waste gas is generated in the acidification tank and is collected and treated through a deodorization system. The rest steps are similar to the high-concentration wastewater, but the equipment operation parameters and the dosage of the medicament are suitable for the content of respective pollutants. According to the characteristic of large difference of wastewater pollutant index concentration, the use amount and treatment process of the physicochemical pretreatment agent are optimized, and the operation cost of water treatment is reduced.
As shown in fig. 3, in the embodiment of the present invention, the wastewater in the medium-concentration acidic wastewater adjusting tank and the wastewater in the medium-concentration alkaline wastewater adjusting tank are mixed and then subjected to acid precipitation, and then enter the air flotation tank, and as shown in fig. 6, the slag discharged from the air flotation tank enters the scum tank, the wastewater enters the neutralization adjusting tank, then enters the coagulation reaction tank, and finally enters the primary sedimentation tank, and as shown in fig. 6, the sludge discharged enters the sludge concentration tank, and the wastewater enters the next subsequent treatment.
In addition, although the high-concentration pretreatment and the medium-concentration pretreatment and other steps in the embodiment of the present invention have the same names of the acidification resolution, air flotation, neutralization adjustment, flocculation, precipitation and the like, it should be noted that the same here only refers to the names of the respective process operations, and the treatment parameters of the specific operation are not limited. The operation names are the same only when the operation is adopted by the two, and the operation process parameters and the like are not completely the same.
And 3, mixing the solutions subjected to the physicochemical pretreatment in the step 2 respectively.
And 4, sequentially carrying out biochemical treatment, advanced oxidation treatment and deep purification treatment on the solution mixed in the step 3.
The embodiment of the invention combines the precipitated water subjected to the quality-based materialization pretreatment and the precipitation into the traditional viscose wastewater treatment process of 'biochemical treatment, advanced oxidation and deep purification'.
Wherein, the biochemical treatment comprises entering an A/O biochemical treatment tank, refluxing and discharging precipitated sludge;
the advanced oxidation step comprises the steps of entering an advanced catalytic oxidation reaction tank, adjusting the pH value to 2-3, and blowing off exhaust gas;
the deep purification comprises the steps of neutralization regulation, flocculation, sedimentation, sludge discharge and wastewater discharge after filtration.
In the embodiment of the invention, as shown in fig. 4, the wastewater of the high-concentration materialization pretreatment and the medium-concentration materialization pretreatment is mixed and enters the comprehensive regulating tank, then enters the A/O tank and the biochemical sedimentation tank, and is combined as shown in fig. 6, the sludge is discharged and enters the sludge concentration tank except the return flow of the activated sludge, the wastewater sequentially enters the advanced catalytic oxidation reaction tank, the air stripping tank, the neutralization regulating tank and the coagulation reaction tank, the wastewater enters the Fenton sedimentation tank after the waste gas is removed, the sludge is discharged and enters the sludge concentration tank, the wastewater enters the activated sand filter tank, the sand washing wastewater is returned and enters the coagulation reaction tank, and the wastewater enters the discharge tank for online monitoring and is discharged after reaching the standard.
In the embodiment of the invention, the step of preferably recycling the reclaimed water into the raw water comprises the following steps:
step 1.1, dividing the wastewater into discharge wastewater and reclaimed water reuse raw water, wherein the water quality index of the reclaimed water reuse raw water is less than that of the discharge wastewater;
and 1.2, dividing the discharged wastewater into acidic wastewater and alkaline wastewater.
In the embodiment of the invention, all wastewater in the viscose fiber production process is not treated and then discharged in a general way, but part of wastewater suitable for reclaimed water reuse is recycled, and other wastewater is treated and then discharged after reaching the standard.
Preferably, the water quality index includes at least one of COD content, TDS content and hardness index content.
In the viscose fiber production process, multiple experiments prove that the acid station secondary steam condensate water and the waste gas post-deacidification water have obviously lower content relative to other waste water pollutants, contain trace cellulose, have low or basically no hardness and can be used as recycled water according to different qualities. Then, the water is purified by neutralization regulation, air floatation, precipitation, oxidation, filtration and the like, and the treated reuse water is directly used as soft water, so that the investment, operation and maintenance cost can be greatly reduced, and the utilization rate of water resources is improved.
And the pH value of the wastewater is adjusted to 6-7.5 by adding alkali, and then the wastewater flows into a coagulation flocculation reaction tank, so that pollutants such as colloids, suspended matters, fine fibers and the like in the wastewater are flocculated into flocs with good precipitation performance.
Then removing suspended matters and non-soluble COD in the wastewater through air flotation and precipitation.
And the waste gas is removed through oxidation, and the COD of the waste water is further reduced.
Finally, fine particles and colloidal substances in the oxidized water are further removed through a filtering deep purification process, so that the recycled water quality stably reaches the standard and is lifted to a soft water station for recycling by a pump.
As shown in fig. 5, in the embodiment of the present invention, raw water enters a reclaimed water reuse raw water regulating tank, then sequentially enters a neutralization regulating tank, a flocculation sedimentation tank and an air flotation tank, and is combined as shown in fig. 6, slag is discharged from the air flotation tank and enters a scum tank, wastewater enters a coagulation reaction zone of a high density sedimentation tank and an inclined plate sedimentation zone of the high density sedimentation tank, and is combined as shown in fig. 6, except that sludge flows back, residual sludge enters a sludge concentration tank, wastewater enters an ozone advanced oxidation tank, ozone jet aeration is performed, and then enters an active sand filter tank and a reuse water tank, and the discharged water is reused by a soft water station.
In addition, as shown in fig. 6, in the embodiment of the present invention, the slag discharged from each treatment process enters the scum pond, the scum and the sludge discharged from each treatment process enter the sludge concentration pond, then enter the sludge conditioning pond and the plate and frame filter press machine room for dehydration, and finally the sludge is incinerated through the green energy center.
Compared with the prior viscose waste water technology, the viscose waste water quality-dividing treatment method has the remarkable characteristics that:
1. refining and grading the acidic wastewater and the alkaline wastewater into high-concentration wastewater and medium-concentration wastewater. The sewage treatment process is provided with two groups of physicochemical pretreatment processes, and the equipment operation parameters and the medicament dosage of the medium-concentration and high-concentration physicochemical pretreatment systems are specifically regulated and controlled according to the concentration difference of pollutants, so that the treatment effect is greatly optimized, and the operation cost is reduced. The sewage after the physicochemical pretreatment is merged and enters a biochemical treatment, advanced oxidation and deep purification system, and the discharged water can reach the first class A standard in the pollutant discharge Standard of urban Sewage treatment plants (GB 18918-2002).
2. The waste gas later-stage acid removal water and the acid station secondary steam condensate water have low concentration and low or no hardness of pollutants, are divided into recycled water raw water, and are treated by an innovative recycled water recycling process to replace a multi-medium filtration, ultrafiltration and reverse osmosis process, so that the service standard of softened water is reached, the waste water operation cost is reduced, the water resource utilization rate is improved, the construction scale of a soft water station is reduced, and the investment cost is greatly reduced.
3. Taking an annual 50 ten thousand ton viscose fiber project as an example, the total amount of wastewater generated is about 55000m 3 And d. The embodiment of the invention adopts a wastewater quality-based treatment method to ensure that the discharge amount of wastewater is from 55000m 3 D is reduced to about 35000m 3 D (emission reduction 36.3%); the reuse amount of the reclaimed water is about 20000m 3 D (reclaimed water reuse rate of 36.3 percent), and the construction scale of the soft water station is reduced by 20000m 3 And d, the purposes of saving investment and operation cost, improving the utilization rate of water resources, reducing pollutant discharge and realizing energy conservation and emission reduction are achieved, the viscose fiber production process is suitable for large-scale popularization and application, and the viscose fiber production process has promotion and guiding significance for the benign development of the whole viscose fiber industry.
The invention is described below in specific examples:
example 1
As shown in fig. 1-6, a viscose waste water quality-separating treatment method comprises the following steps:
step 1, classifying and collecting the wastewater.
Taking 50 ten thousand tons of viscose fiber annual production as an example, the wastewater produced in each workshop is classified and collected as the following table 2:
table 2: produced waste water and pollutant content meter
Entering a sewage plant:
high-concentration alkaline wastewater: the raw liquid viscose alkaline waste water, the spinning high-alkali high-sulfur waste water and the waste gas washing tower waste water. The COD content of the mixed wastewater is 1500-3000 mg/L, S 2- The content is 35-60 mg/L, the pH value is 11-13, and the temperature is 30-35 ℃.
High-concentration acidic wastewater: acid station high acid wastewater, spin-wash wastewater, waste gas desulfurization and deacidification wastewater. The COD content of the mixed wastewater is 500-1200 mg/L, Zn 2+ The content is 80-200 mg/L, the pH value is 1-3, the TDS is 8000-18000 mg/L, and the temperature is 45-55 ℃.
Medium-concentration alkaline wastewater: spinning secondary washing wastewater and waste gas condensation cooling tower wastewater. The COD content of the mixed wastewater is 250-600 mg/L, S 2- The content is 20-45 mg/L, the pH value is 8-10, and the temperature is 30-35 ℃.
Medium-concentration acidic wastewater: the method comprises the steps of spinning general acidic wastewater, acid station general acidic wastewater and waste gas initial acid removal. The COD content of the mixed wastewater is 200-500 mg/L, Zn 2+ The content is 20-40 mg/L, the pH value is 4-6, the TDS is 4000-8000 mg/L, and the temperature is 35-45 ℃.
The reclaimed water is reused as raw water: and (4) performing secondary steam condensate water and acid water removal in the later stage of waste gas in the acid station. COD in the mixed wastewater is mainly fiber, the COD content is 20-40 mg/L, the pH value is 3-4, the TDS is 300-600 mg/L, and the temperature is 35-45 ℃.
The high-concentration alkaline wastewater enters a high-concentration alkaline wastewater adjusting tank, the high-concentration acidic wastewater enters a high-concentration acidic wastewater adjusting tank, the medium-concentration alkaline wastewater enters a medium-concentration alkaline wastewater adjusting tank, and the medium-concentration acidic wastewater enters a medium-concentration acidic wastewater adjusting tank.
And 2-4, a wastewater treatment process and a reclaimed water reuse treatment process.
(1) The wastewater treatment process comprises the following steps:
lifting the high-concentration acidic wastewater and the high-concentration alkaline wastewater to a high-concentration materialization pretreatment process: acidification and resolution, air stripping, air flotation, neutralization and adjustment, zinc removal and flocculation and precipitation.
Lifting the medium-concentration acidic wastewater and the medium-concentration alkaline wastewater to a medium-concentration materialization pretreatment process: acidification and resolution, air flotation, neutralization and adjustment, zinc removal and flocculation and precipitation. S in medium-concentration wastewater 2- Low content of (A), no separate stripping tank, and small amount of H 2 S、CS 2 And the waste gas is generated in the acidification tank and is collected and treated through a deodorization system.
Wherein, the pH value of acidification and resolution is adjusted to 2-3 by adding sulfuric acid.
Neutralization regulation is effected by addition of Ca (OH) 2 Adjusting the pH value to 7-8.
Flocculation is carried out by adding Na 2 CO 3 Coagulant PAC and flocculant PAM.
The high-concentration pretreatment and medium-concentration pretreatment precipitation effluent enters a comprehensive buffer pool to be fully mixed, and then enters a subsequent treatment process of 'biochemical treatment, advanced oxidation and deep purification'.
And adding urea and monoammonium phosphate into the comprehensive buffer tank (comprehensive adjusting tank) for aeration stirring.
Advanced oxidation is carried out by adding H into advanced catalytic oxidation reaction tank 2 SO 4 、FeSO 4 、H 2 O 2 Adjusting the pH value to 2-3.
(2) The reclaimed water reuse treatment process comprises the following steps:
the secondary condensed water and the acid-removed water in the later period of the waste gas in the acid station enter a reclaimed water recycling raw water regulating tank, are lifted to a neutralization regulating tank by a pump, and the pH value of the waste water is regulated to 6-7.5 by adding sodium hydroxide;
the wastewater automatically flows to a coagulation flocculation reaction tank, and pollutants such as colloid, suspended matters, fine fibers and the like in the wastewater are flocculated into flocs with good precipitation performance by adding PAC and PAM;
the effluent of the reaction tank flows to the air floatation tank automatically. The air flotation mode of the flow air flotation tank in water recycling comprises dissolved air flotation, aeration air flotation, electrolytic air flotation and the like, the air flotation tank comprises an ultra-efficient shallow layer circular air flotation tank, a traditional rectangular air flotation tank and the like, the dissolved air equipment generates highly dispersed micro bubbles, hydrophobic cellulose particles are adhered to form a water-gas-particle three-phase mixed system, the three-phase mixed system floats to the water surface, a scum layer is formed and is scraped, so that solid-liquid separation is realized, and suspended matters and non-soluble COD in wastewater are removed;
the effluent of the air floatation tank flows to a high-efficiency sedimentation tank automatically, the high-efficiency sedimentation process of the water recycling process comprises a DENSADED high-density sedimentation tank, an ACTIFLO micro-sand weighted flocculation high-efficiency sedimentation tank, a middle-set high-density sedimentation and the like, and the DENSADED high-density sedimentation tank is used for explanation in the technical scheme. The DENSADED high-density sedimentation tank integrates a coagulation zone, a flocculation reaction zone and a sedimentation concentration zone, recycled water is subjected to coagulation reaction, and PAC coagulant is used for removing trace pollutants through adsorption; raw water, return sludge and PAM coagulant aid are uniformly mixed from bottom to top by a stirring paddle at the bottom of an inner circular guide cylinder in a flocculation reaction zone to obtain larger flocs; the flocs in the sedimentation concentration zone slowly enter the sedimentation zone, and are collected into sludge and concentrated at the lower part of the sedimentation tank. The inclined plate is arranged at the upper part of the sedimentation tank and is used for removing redundant alum blossom and ensuring the quality of the effluent. Part of the concentrated sludge is pumped to the inlet of the reaction tank by a sludge circulating pump in the concentration zone, and the other part of the residual sludge is pumped out by a sludge pump and sent to a sludge dewatering room or is subjected to other treatment. The high-efficiency sedimentation tank further removes suspended matters and non-soluble COD remained in the wastewater so as to ensure the stable operation of a subsequent advanced oxidation system;
the effluent of the high-efficiency sedimentation tank flows automatically to an advanced oxidation tank, the advanced oxidation process of the water recycling process comprises an ozone oxidation process, a photocatalytic oxidation process, an electrochemical oxidation process and the like, and the ozone oxidation process is explained in the technical scheme. The prepared ozone is uniformly mixed and reacted with the reuse water through an ejector, hydroxyl radicals generated by the ozone in the water have strong oxidizing property, trace residual odor in the wastewater is removed, and COD (chemical oxygen demand) of the wastewater is further reduced to enable the COD to be less than or equal to 10mg/L so as to meet the requirement of the reuse water;
in order to meet the requirement that the turbidity of the reuse water is less than or equal to 1mg/L, the effluent of the advanced oxidation pond still needs to be treated by a deep purification process, the deep purification process of the water reuse flow comprises a continuous active sand filter, a V-shaped filter, a multi-media filter and the like, and the continuous active sand filter is used for explanation in the technical scheme. In the continuous active sand filter, the filter material further removes fine particles and colloidal substances in the high-grade oxidation effluent, so that the recycled water quality stably reaches the standard.
The effluent of the continuous active sand filter flows automatically to a reclaimed water recycling reservoir and is lifted to a soft water station by a pump for recycling.
In conclusion, the viscose waste water quality-based treatment method provided by the embodiment of the invention can greatly optimize the treatment effect, reduce the investment cost and waste water operation cost, improve the water resource utilization rate and realize the purposes of energy conservation and emission reduction.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments, and it is not to be construed that the specific embodiments of the present invention are limited to those descriptions. It will be apparent to those skilled in the art that various modifications, additions and substitutions can be made without departing from the spirit of the invention.
Claims (10)
1. A quality-divided treatment method for viscose fiber wastewater is suitable for wastewater generated in a viscose fiber production process, and is characterized by comprising the following steps of:
step 1, dividing the wastewater into acidic wastewater and alkaline wastewater, wherein the acidic wastewater comprises high-concentration acidic wastewater and medium-concentration acidic wastewater, the pH value of the high-concentration acidic wastewater is lower than that of the medium-concentration acidic wastewater, the alkaline wastewater comprises high-concentration alkaline wastewater and medium-concentration alkaline wastewater, and the pH value of the high-concentration alkaline wastewater is higher than that of the medium-concentration alkaline wastewater;
step 2, mixing the high-concentration acidic wastewater and the high-concentration alkaline wastewater for high-concentration materialization pretreatment, and mixing the medium-concentration acidic wastewater and the medium-concentration alkaline wastewater for medium-concentration materialization pretreatment;
and 3, mixing the solutions subjected to the physicochemical pretreatment in the step 2 respectively.
2. The viscose waste water quality-dividing treatment method according to claim 1, characterized in that: the index content of the acidic pollutants in the high-concentration acidic wastewater in the step 1 is greater than the index content of the acidic pollutants in the medium-concentration acidic wastewater.
3. The viscose waste water quality-dividing treatment method according to claim 1, characterized in that: the index content of the alkaline pollutants in the high-concentration alkaline wastewater in the step 1 is greater than that of the medium-concentration alkaline wastewater.
4. The viscose waste water quality-dividing treatment method according to claim 1, characterized in that: the operation of high-concentration materialization pretreatment in the step 2 comprises acidification and resolution, air stripping, air flotation, neutralization and adjustment, flocculation and precipitation.
5. The viscose waste water quality-dividing treatment method according to claim 1, characterized in that: the operation of the medium concentration pretreatment in the step 2 comprises acidification and desorption, air flotation, neutralization and adjustment, flocculation and precipitation.
6. The viscose waste water quality-dividing treatment method according to claim 1, characterized in that: further comprising:
and 4, performing biochemical treatment, advanced oxidation treatment and deep purification treatment on the solution mixed in the step 3.
7. The viscose waste water quality-divided treatment method according to claim 1, characterized in that: the step 1 further comprises:
step 1.1, dividing the wastewater into discharge wastewater and reclaimed water reuse raw water, wherein the water quality index of the reclaimed water reuse raw water is less than that of the discharge wastewater;
and 1.2, dividing the discharged wastewater into acidic wastewater and alkaline wastewater.
8. The viscose waste water quality-dividing treatment method according to claim 7, characterized in that: the water quality index comprises at least one of COD content, TDS content and hardness index content.
9. The viscose waste water quality-dividing treatment method according to claim 7, characterized in that: and the step 2 also comprises the step of recycling the reclaimed water recycled raw water after purification treatment.
10. The viscose waste water quality-dividing treatment method according to claim 9, characterized in that: the operation of the purification treatment in the step 2 comprises neutralization and adjustment, air floatation, precipitation, oxidation and filtration.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603112A (en) * | 2011-12-21 | 2012-07-25 | 浙江东发环保工程有限公司 | Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method |
| CN102616988A (en) * | 2012-03-23 | 2012-08-01 | 安徽南风环境工程技术有限公司 | Wastewater processing system during production of HIV (Human Immunodeficiency Virus) prevention medicament |
| CN103864260A (en) * | 2012-12-13 | 2014-06-18 | 高松 | Method for processing viscose fiber production wastewater |
| CN109437480A (en) * | 2018-11-23 | 2019-03-08 | 华夏碧水环保科技有限公司 | A kind of viscose fiber wastewater treatment process |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603112A (en) * | 2011-12-21 | 2012-07-25 | 浙江东发环保工程有限公司 | Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method |
| CN102616988A (en) * | 2012-03-23 | 2012-08-01 | 安徽南风环境工程技术有限公司 | Wastewater processing system during production of HIV (Human Immunodeficiency Virus) prevention medicament |
| CN103864260A (en) * | 2012-12-13 | 2014-06-18 | 高松 | Method for processing viscose fiber production wastewater |
| CN109437480A (en) * | 2018-11-23 | 2019-03-08 | 华夏碧水环保科技有限公司 | A kind of viscose fiber wastewater treatment process |
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