CN107697998B - Based on Al3+Pretreatment method of internal source flocculation sloppy scram black liquor - Google Patents

Based on Al3+Pretreatment method of internal source flocculation sloppy scram black liquor Download PDF

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CN107697998B
CN107697998B CN201711023390.4A CN201711023390A CN107697998B CN 107697998 B CN107697998 B CN 107697998B CN 201711023390 A CN201711023390 A CN 201711023390A CN 107697998 B CN107697998 B CN 107697998B
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flocculation
black liquor
cleaning wastewater
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liquor
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CN107697998A (en
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胡小兵
韦京云
林睿
徐水林
常静
唐素兰
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Anhui University of Technology AHUT
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention discloses a catalyst based on Al3+Endogenous flocculated rice paperA pretreatment method of waste cooking liquor, belonging to the technical field of waste water treatment. According to the invention, aluminum material pen tube cleaning wastewater is added into the sloppy scrawless cooking black liquor to carry out the integrated reaction of lignin destabilization, endogenous flocculation and natural sedimentation, and the low-COD and high-alkalinity straw embryonic pulp ash cleaning wastewater generated before sloppy scrawless production is added into the sedimentary acidic supernatant to carry out pH back-mixing. In the lignin destabilization-endogenous flocculation reaction, the adding ratio of the aluminum pen tube cleaning wastewater to the black liquor is 15: 1-85: 1. The aluminum pen tube cleaning wastewater contains Al3+Has the function of endogenous flocculation, can accelerate the flocculation of tiny particles which are stably separated out from the lignin of the poor-boiling black liquor on the Chinese art paper, can also remove the colloidal pollutants in the wastewater, and improves the removal effect on COD. The invention does not add any chemical agent, utilizes the interaction of the three kinds of waste water to achieve the aim of simultaneously treating the three kinds of waste water, and is a feasible pretreatment method.

Description

Based on Al3+Pretreatment method of internal source flocculation sloppy scram black liquor
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to an Al-based catalyst3+A pretreatment method of internal source flocculation slobber digestion black liquor.
Background
The rice paper is the most famous one of the hand papers in China, although the rice paper production has nearly thousand years of history, the traditional process is still used up to now, and most of the procedures depend on manual operation. The Chinese art paper takes sloppy and sandalwood skin as raw materials, generates various waste water in production, wherein the most serious pollution is black liquor generated by sloppy and sloppy cooking of the sandalwood skin, and the China art paper has high COD concentration, large chroma and strong alkalinity.
The common pretreatment of black liquor is to dilute it, neutralize it with acid or acidify it to separate out the lignin that is present in large quantities in the spent liquor. "acid precipitation-flocculation method" for treating waste liquid from paper making (Cai super et al, 2006) with 96% -98% H2SO4The acid separating agent can make the COD removing rate reach 50-60%, but the treatment process has long route, more equipment and facilities and high operation cost. "study of acidification effects of different acids on papermaking black liquor" (Linn et al, 2012) will screen out H2SO4As acid-out agent, the chroma and COD removal rate of black liquor respectively reach 97.9% and 66.1%, and the lignin-out quantity is 8.65 g/L. "improvement and application of acid-out lignin method for treating black liquor of paper-making" (Yanweiming et al, 1997), and adopts the method of adding flocculant at the same time of acid-out and heating waste liquor, so that it not only can make lignin further coagulate, reduce filtration load when separating lignin, and raise lignin filtration efficiency, but also can raise the removal rate of pollutants of chemical oxygen demand and so on by using flocculation action2SO4And a flocculant, the treatment cost is high.
In order to reduce the adding cost of waste liquor neutralization acid, a novel papermaking black liquor treatment method and a novel papermaking black liquor treatment system (CN102757159A) add industrial waste acid into papermaking waste liquor wastewater for acid precipitation treatment, generate a large amount of lignin floc after acid precipitation, and filter and separate the lignin floc step by step through a filter tank. And (3) adding polyaluminium chloride and anionic Polyacrylamide (PAM) into the filtrate after the floc separation in a coagulation air flotation device under pneumatic stirring for coagulation sedimentation to form flocs. Using Ca (OH) to sewage after coagulation air flotation2And (4) after the pH value of the saturated solution is adjusted to be neutral, the saturated solution enters a biochemical system for treatment. Although the method adopts industrial waste acid to neutralize the waste liquid and saves the adding cost of acid, the coagulant and the saturated Ca (OH)2The solution consumption is large, the treatment cost is still high, and the treatment process is relatively complex.
Therefore, a more cost-effective, simple-process pretreatment method for black liquor is needed.
Disclosure of Invention
1. Technical problem to be solved by the invention
The method aims to solve the problems of complex treatment process, more added medicament, resource waste and high treatment cost of the papermaking black liquor. The invention provides a simple and low-cost pretreatment method of waste water black liquor with poor rice paper, namely, a pretreatment method based on Al3+A pretreatment method of internal source flocculation sloppy scrawled black liquor; the method is suitable for the technical requirements of papermaking black liquor, and the acidic wastewater containing an endogenous flocculant is screened from a plurality of process wastewater to carry out pretreatment of the digestion black liquor, so that the sloppy waste of rice paper is reducedLoad of water post-treatment; the method embodies the idea of treating waste with waste, treats the cleaning wastewater of the aluminum pen tube and the cleaning wastewater of the grass embryo pulp ash while treating the illegible black liquor, and achieves the purpose of jointly treating three types of wastewater.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a method for preparing a catalyst based on Al3+The pretreatment method of the internal source flocculation sloppy scrawled black liquor comprises the following steps:
(1) gradually adding pen tube cleaning wastewater into the sloppy scrawled black liquor with a certain volume, stirring, and carrying out an integrated reaction of lignin destabilization, endogenous flocculation and natural sedimentation;
(2) according to the volume of the pen tube cleaning wastewater added, determining the volume adding ratio of the pen tube cleaning wastewater in the illegible black liquor, and determining the amount of the pen tube cleaning wastewater to be added for treating the illegible black liquor;
(3) naturally settling for 0.5h after reaction, and separating the reaction flocculation sediment from the supernatant;
(4) adding the low-COD grass embryo pulp ash into the settled acidic supernatant to clean the wastewater, and performing pH reverse adjustment to reach the discharge standard;
(5) determining the volume adding ratio of the grass embryo pulp ash cleaning wastewater in the acidic supernatant according to the adding volume of the grass embryo pulp ash cleaning wastewater, and determining the amount of the grass embryo pulp ash cleaning wastewater needing to be added in the treatment of the supernatant.
Further, the sloppy cooking black liquor is from the waste water generated in the sloppy cooking treatment production process of the raw materials for production of the sloppy paper, and the COD is 1.615～1.65*105mg/L, pH 10.3-11.2.
Furthermore, the pen tube cleaning wastewater is wastewater generated by cleaning the surface of an aluminum pen tube, has a pH of 1.2-2.0 and contains H2SO4、HNO3、H3PO4And Al3+，Al3+Is an endogenous flocculant.
Further, gradually adding the aluminum pen tube cleaning wastewater in the step (1) until fine particles generated in the waste liquid are not increased any more.
Further, the volume ratio of the aluminum pen tube cleaning wastewater to the poor rice paper cooking black liquor is determined to be 15: 1-85: 1 in the step (2).
Furthermore, the pH value of the acid wastewater of the supernatant obtained by settling and separating in the step (3) is 3.0-3.5.
Furthermore, the waste water from the cleaning of the grass germ pulp ash in the step (4) is generated in the illegible treatment process, the COD concentration is 410-450 mg/L, and the pH value is 10.0-12.4.
Further, the pH value of the wastewater is adjusted to 6.9-7.1 in the step (4).
Furthermore, the adding ratio of the grass embryo pulp ash cleaning wastewater to the flocculation sedimentation supernatant is determined to be 16: 1-4: 1 in the step (5).
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention relates to a method for preparing a catalyst based on Al3+The internal source flocculation pretreatment method of the sloppy Chinese scrawling black liquor has the operation process of ' mixing-settling ' + pH backshifting ', saves a preparation pool of strong acid, strong base and coagulant, a medicament adding system, an acid precipitation sedimentation pool or an air floatation pool and other separation structures in the prior art, has simple treatment process and convenient operation, and has very strong practical application value for the sloppy Chinese scrawling production enterprises taking manual operation as the main part;
(2) the invention relates to a method for preparing a catalyst based on Al3+The pretreatment method of the internal source flocculated waste liquor from the scratchy paper realizes the aim of treating waste by waste and simultaneously treating three kinds of waste water, adopts the pen tube cleaning waste water to treat the waste liquor from the scratchy paper, adds the acid excessive in the scratchy waste water from the production of the scratchy paper, reduces the COD and the chroma in the waste liquor from the scratchy paper, removes the plant pollution P in the waste water from the pen tube cleaning, reduces the alkalinity of the waste water from the scratchy paper cleaning, and simultaneously treats the three kinds of waste water;
(3) the invention relates to a method for preparing a catalyst based on Al3+Internal source flocculation pre-treatment of waste liquor on scratchyThe treatment method comprises the steps of adopting aluminum material pen tube cleaning wastewater to destabilize the lignin in the waste liquor from the scrawled digestion, completing the pH value only by reaching 4.5 and 20-30 ℃ at normal temperature, and adopting strong acid (H) generally2SO4HCl) to separate out lignin in the papermaking black liquor, the pH value needs to be below 3.5, the reaction temperature needs to reach 40-50 ℃, and the requirement on conditions is high, so that the consumption of treatment energy can be reduced;
(4) the invention relates to a method for preparing a catalyst based on Al3+The pretreatment method of the internal source flocculation sloppy cooking black liquor, no chemical agent is required to be added in the wastewater treatment, the pen tube cleaning wastewater is a destabilizing agent of the sloppy cooking black liquor lignin, wherein the existing Al3+The flocculant is an endogenous flocculant, can accelerate the flocculation of fine particles of destabilization crystallization of lignin in the poor scratchy black liquor, can remove other colloidal pollutants in wastewater, improves the removal effect of COD, realizes the standard reaching of pH by using the straw embryo pulp ash cleaning wastewater as a pH back-regulating agent, and belongs to a green method;
(5) the invention relates to a method for preparing a catalyst based on Al3+The pretreatment method of the internal source flocculation sloppy scram cooking black liquor treats 1 ton of sloppy scram cooking black liquor, and can save the use cost of strong acid, coagulant and lime water by 630-760 yuan; meanwhile, 15-85 tons of pen tube cleaning wastewater and 250-340 tons of grass embryo pulp ash cleaning wastewater can be processed, and the processing cost is saved by 4556-8150 yuan. The cost is saved by 5186 yuan and 8910 yuan for treating one ton of rice paper cooking waste liquid. According to statistical calculation, the method can save processing cost 5678-. The pretreatment method for treating the waste cooking liquor on the scrawled hand can save the addition of the medicament and greatly reduce the treatment cost.
Detailed Description
For a further understanding of the present invention, reference will now be made to the following examples.
The invention relates to a method for preparing a catalyst based on Al3+The pretreatment method of the internal source flocculated waste liquor from sloppy scram cooking comprises screening out the waste water from industrial production according to the thinking of 'treating waste by waste and green treatment' for effectively and economically treating the black liquor from sloppy scram cookingContains wastewater formed by various water treatment functional chemicals, performs integrated reaction, and forms a simple treatment process suitable for pretreatment of the waste cooking liquor on the rice paper.
The technical scheme of the invention is as follows:
(1) in the black liquor discharged in the scrawled production with a certain volume, gradually adding aluminum pen tube cleaning wastewater and stirring, and carrying out the integrated reaction of lignin destabilization, endogenous flocculation and natural sedimentation until a large amount of fine particles are generated in the waste liquor. The waste water generated in the sloppy scrawled cooking process has COD up to 1.615～1.65*105mg/L, color number 1 x 105And (4) doubling. The waste water is alkaline due to the residual lime, and the pH value is 10.3-11.2. The pen holder cleaning wastewater comes from an aluminum pen holder cleaning plant according to H2SO4:HNO3:H3PO4Preparing acid liquor according to the volume ratio of 2:1:0.01, putting the acid liquor into a pickling tank, and putting the writing brush pen tube into the pickling tank for soaking treatment. The pen tube is fished out and placed in a clean water tank for cleaning, and the waste water discharged after the cleaning solution is used is the pen tube cleaning waste water, and the pH value is 1.2-2.0. Ca (OH) in black liquor2H in waste water from cleaning pen tube2SO4、H3PO4The neutralization reaction is firstly carried out to generate CaSO which is slightly soluble in water4、Ca3(PO4)2And becomes a particle composition formed by the reaction. When the pen tube cleaning wastewater is excessively added into the solution and is acidic (pH is less than or equal to 4.5), the lignin in the poor-rice-paper cooking black liquor is destabilized and separated out from the waste liquor to form insoluble substances. Al in the pen tube cleaning wastewater in the contact reaction of the two wastewater3+Has the function of endogenous flocculation, can accelerate the flocculation of tiny particles which are stably separated out from the lignin of the poor-cooking black liquor on the Chinese art paper, can remove the colloidal pollutants in the wastewater, and improves the effect of removing COD. The fine particles are prepared from Al in aluminum product pen tube wastewater in destabilized lignin in slightly soluble sediments of reaction and poor rice paper cooking black liquor3+The particles formed by the endogenous flocculation, and the like.
(2) According to the volume of the finally added cleaning wastewater, the volume adding ratio of the aluminum pen tube cleaning wastewater in the black liquor is determined according to the treatment requirement of 'forming the most particles and removing the most COD', the amount of the pen tube cleaning wastewater needing to be added in the treatment of the illegible scrawled black liquor is determined, and the volume ratio of the pen tube cleaning wastewater to the illegible scrawled black liquor is 15: 1-85: 1.
(3) And naturally settling for 0.5h after reaction, and separating the reaction flocculation sediment from the supernatant, wherein the pH of the acidic supernatant is 3.0-3.5.
(4) The alkaline straw body ash cleaning wastewater is used for cleaning the straw body ash in the process flow of self-illegible treatment, the pH is 10.0-12.4, and the COD is 410-450 mg/L.
(5) Determining the volume adding ratio of the grass embryo pulp ash cleaning wastewater in the acidic supernatant according to the adding volume of the grass embryo pulp ash cleaning wastewater, and determining the volume of the grass embryo pulp ash cleaning wastewater which needs to be added in the acidic supernatant per unit volume. The volume adding ratio of the grass germ pulp ash cleaning wastewater in the acidic supernatant is 16: 1-4: 1, and the pH value of the wastewater is adjusted to 6.9-7.1.
The invention realizes the purpose of treating waste by waste and simultaneously treating three kinds of waste water, adopts the pen tube cleaning waste water to treat the illegible scram cooking black liquor, adds the acid of the waste water generated in the production of the rice paper, reduces the COD and the chromaticity in the illegible scram cooking black liquor, removes the plant pollution P in the pen tube cleaning waste water, reduces the alkalinity of the waste water for cleaning the waste water of the scram pulp ash, and simultaneously treats the three kinds of waste water. The operation process of pretreating the black liquor from the sloppy scram cooking is 'mixing-settling' + pH back-regulation, saves a preparation pool of strong acid, strong base and coagulant, a medicament adding system, an acid precipitation sedimentation tank or an air floatation tank and other separation structures in the prior art, has simple treatment process and convenient operation, and has very strong practical application value for rice paper production enterprises which mainly operate by hand. The lignin in the poor-scrawled black liquor is destabilized by adopting aluminum pen tube cleaning wastewater, the pH value only needs to reach 4.5, the removal can be completed at the normal temperature of 20-30 ℃, the lignin removal condition is low, and the lignin is generally removed by adopting strong acid(H2SO4HCl) to separate out lignin from the papermaking black liquor, the pH value needs to be below 3.5, the reaction temperature needs to reach 40-50 ℃, and the requirement on conditions is high, so that the consumption of treatment energy can be reduced. In the wastewater treatment, no chemical agent is required to be added, the pen tube cleaning wastewater is a destabilizing agent of the black liquor lignin digested from sloppy Chinese rice paper, wherein Al exists3+Is an endogenous flocculant, can accelerate the flocculation of fine particles in the destabilization crystallization of the lignin of the poor-cooking black liquor on the Chinese patent paper, can remove other colloidal pollutants in the wastewater, improves the removal effect of COD, realizes that the pH reaches the standard by using the pH back-mixing agent as the cleaning wastewater of the grass embryo pulp ash, and is a green and environment-friendly wastewater treatment method.
Example 1
One of the examples is based on Al3+The pretreatment method of the internal source flocculation waste sloppy scrawler cooking liquor comprises the following specific processes:
(1) from the genuine on-the-go district Anhui province of the country of the Ming province of the twelve town sloppy grass production of the rice paper a peasant household black liquor of cooking discharges pond, a writing brush manufacturing plant respectively gather the sloppy grass of the rice paper production black liquor of cooking and aluminum product pen tube cleaning waste water.
(2) The pH of the waste liquor is 10.3 and CODCrIs 1.65 x 105mg/L, color number 1 x 105The pH of the pen tube cleaning wastewater is 1.2, and the COD is 40.00 mg/L.
(3) Mixing the cleaning wastewater and the illipe digestion black liquor according to the ratio of 15:1, reacting the mixed liquor for 15min, and measuring that COD in the supernatant is about 4000 mg/L, the pH is 3.1, the chroma is 3000 times, the removal rates of COD and chroma respectively reach 97.6% and 97%, and the precipitation amount of solids is 2.4 g/L mixed liquor.
(4) And (3) settling and separating the mixed solution containing the flocs, wherein the sediment is used for improving alkaline soil, and the supernatant is acidic and has the pH value of 3.2.
(5) According to the volume ratio of 16:1, the rice paper grass embryo pulp ash cleaning wastewater with low COD (410 mg/L) and high alkalinity (pH is 11.4) is added into the supernatant, the pH is reversely adjusted to about 7.0, and the COD concentration (4000 mg/L) in the supernatant is further reduced to 603 mg/L.
(6) After pretreatment, the removal rates of COD and chroma of the sloppy scram cooking black liquor reach 99.6 percent and 99.8 percent respectively.
Example 2
(1) From a writing brush manufacturing factory, a farming household illegible black liquor discharge pond of another town of the Ming province Jing county in the genuine Xuan paper producing area, respectively collect pen tube cleaning wastewater, the illegible black liquor of the Xuan paper production illegible.
(2) The pH of the pen tube cleaning wastewater is 2.0, the COD is 38.00 mg/L, the pH of the sloppy cooking black liquor is 11.2, and the COD is 1.61 x 105mg/L, color number 1X 105And (4) doubling.
(3) The cleaning wastewater and the illegible black liquor are mixed and reacted according to the ratio of 85:1, the pH value is 3.4 after the mixed liquor reacts for 15min, the COD content in the supernatant is about 1400 mg/L, the chroma is 125 times, the removal rates of the COD and the chroma respectively reach 99.1 percent and 99.9 percent, and the precipitation amount of lignin is 0.9 g/L mixed liquor.
(4) And (3) settling and separating the mixed solution containing the flocs, wherein the sediment is used for improving alkaline soil, and the supernatant is acidic and has the pH of 3.4.
(5) According to the ratio of 4:1, the rice paper grass embryo pulp ash cleaning wastewater with low COD (450 mg/L) and high alkalinity (pH is 12.4) is added into the supernatant, the pH is reversely adjusted to be about neutral (7.1), and the COD concentration (1400 mg/L) is reduced to 628 mg/L.
After pretreatment, the removal rate of COD and chroma of the sloppy cooking black liquor respectively reaches about 99.6 percent and 100 percent.
Example 3
(1) From a writing brush manufacturing factory, a farming household illegible black liquor discharge pond of another town of the Ming province Jing county in the genuine Xuan paper producing area, respectively collect pen tube cleaning wastewater, the illegible black liquor of the Xuan paper production illegible.
(2) The pH of the pen tube cleaning wastewater is 1.5, the COD is 45.00 mg/L, the pH of the sloppy cooking black liquor is 10.5, and the COD is 1.63 x 105mg/L, color number 1X 105And (4) doubling.
(3) The cleaning wastewater and the illegible black liquor are mixed according to the ratio of 65:1, the pH value is 3.2 after the mixed liquor reacts for 15min, the COD content in the supernatant is about 1500 mg/L, the chroma is 125 times, the removal rates of the COD and the chroma respectively reach 99.1 percent and 99.9 percent, and the precipitation amount of lignin is 1.2 g/L mixed liquor.
(4) And (3) settling and separating the mixed solution containing the flocs, wherein the sediment is used for improving alkaline soil, and the supernatant is acidic and has the pH value of 3.2.
(5) Adding the rice paper grass embryo pulp ash cleaning wastewater with low COD (430 mg/L) and high alkalinity (pH is 11.4) into the supernatant according to the proportion of 7:1, adjusting the pH to about 6.9, and adjusting the COD to be aboutCrThe concentration was reduced to 600 mg/L.
After pretreatment, COD of waste liquor from sloppy cookingCrThe chroma removal rate reaches about 99.6 percent and 100 percent respectively.
The pretreatment method for the waste cooking black liquor of embodiment 1-3 can treat 1 ton of waste cooking black liquor, and can save the use cost of strong acid, coagulant and lime water by 630-; meanwhile, 15-85 tons of pen tube cleaning wastewater and 250-340 tons of grass embryo pulp ash cleaning wastewater can be processed, and the processing cost is saved by 4556-8150 yuan. The cost is saved by 5186 yuan and 8910 yuan for treating one ton of rice paper cooking waste liquid. According to statistical calculation, the method can save processing cost 5678-. The pretreatment method for treating the waste cooking liquor on the scrawled hand can save the addition of the medicament and greatly reduce the treatment cost.

Claims (6)

1. Based on Al3+The pretreatment method of the internal source flocculation waste slobber cooking liquor is characterized by comprising the following steps:
(1) gradually adding aluminum pen tube cleaning wastewater into a certain volume of the scrawled black liquor, stirring, and carrying out integrated reaction of lignin destabilization, endogenous flocculation and natural sedimentation until fine particles generated in the waste liquor are not increased any more; the pen tube cleaning wastewater is wastewater generated by cleaning the surface of an aluminum pen tube, has a pH value of 1.2-2.0, and contains H2SO4、HNO3、H3PO4And Al3+，Al3+Is an endogenous flocculant;
(2) according to the volume of the pen tube cleaning wastewater added, determining the volume adding ratio of the pen tube cleaning wastewater in the illegible black liquor, and determining the amount of the pen tube cleaning wastewater to be added for treating the illegible black liquor;
(3) naturally settling for 0.5h after reaction, and separating the reaction flocculation sediment from the supernatant;
(4) adding the low-COD grass embryo pulp ash into the settled acidic supernatant to clean the wastewater, carrying out pH reverse adjustment, and adjusting the pH value of the wastewater to 6.9-7.1 to reach the discharge standard;
determining the volume adding ratio of the grass embryo pulp ash cleaning wastewater in the acidic supernatant according to the adding volume of the grass embryo pulp ash cleaning wastewater, and determining the amount of the grass embryo pulp ash cleaning wastewater needing to be added in the treatment of the supernatant.
2. Al-based alloy according to claim 13+The pretreatment method of the internal source flocculation waste liquor on the scratchy digestion is characterized in that: the sloppy cooking black liquor is from the waste water generated in the sloppy cooking treatment production process of the raw materials for producing the sloppy paper, and the CODCr is 1.61 105～1.65*105mg/L, pH 10.3-11.2.
3. Al-based alloy according to claim 23+The pretreatment method of the internal source flocculation waste liquor on the scratchy digestion is characterized in that: and (3) determining the volume ratio of the aluminum pen tube cleaning wastewater to the illegible scratchy black liquor in the step (2) to be 15: 1-85: 1.
4. Al-based alloy according to claim 33+The pretreatment method of the internal source flocculation waste liquor on the scratchy digestion is characterized in that: and (4) settling and separating the supernatant in the step (3) to obtain the supernatant with the pH of 3.0-3.5.
5. Al-based alloy according to claim 43+The pretreatment method of the internal source flocculation waste liquor from scratchy digestion is characterized in that the waste liquor from the step (4) from the step of the scratchy treatment process is generated, the COD concentration is 410-450 mg/L, and the pH is 10.0-12.4.
6. Al-based alloy according to claim 53+Internal source flocculation pre-treatment method for waste liquor generated in sloppy scratchpad cookingThe method is characterized in that: and (5) determining the volume ratio of the grass germ pulp ash cleaning wastewater to the supernatant to be 16: 1-4: 1.
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CN105217754A (en) * 2015-09-28 2016-01-06 江苏永葆环保科技股份有限公司 A kind of method fully utilizing ferro-aluminum surface acid-washing spent acid waste residue and prepare compound coagulant

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