CN114105396A - Process method for efficiently treating Lyocell short fiber wastewater - Google Patents
Process method for efficiently treating Lyocell short fiber wastewater Download PDFInfo
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- CN114105396A CN114105396A CN202010892280.7A CN202010892280A CN114105396A CN 114105396 A CN114105396 A CN 114105396A CN 202010892280 A CN202010892280 A CN 202010892280A CN 114105396 A CN114105396 A CN 114105396A
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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Abstract
The invention discloses a process method for efficiently treating Lyocell short fiber wastewater, which relates to the field of Lyocell short fiber wastewater3The water sample is subjected to catalytic ozonation, the oxidation reaction time is controlled to be 80-120 minutes, the effluent can finally reach COD (chemical oxygen demand) of not more than 50mg/L, TN of not more than 15mg/L, and the process method has the advantages of simplicity in operation, low cost, high treatment efficiency, strong impact load resistance, no secondary pollution and the like in practical application, can realize the ammoniation and the removal of the organic nitrogen which is difficult to degrade in the wastewater, and can realize the ammonification and the removal of the organic nitrogen which is difficult to degrade.
Description
Technical Field
The invention belongs to the technical field of Lyocell short fiber wastewater, and particularly relates to a process method for efficiently treating Lyocell short fiber wastewater.
Background
At present, the Lyocell short fiber is mainly produced and manufactured by adopting an NMMO solvent spinning process, and a large amount of toxic and harmful waste water is generated in the production process. Such wastewater generally contains high-content pollutants such as inorganic salts, highly toxic organic substances, high-concentration organic nitrogen compounds and the like, and COD and nitrogen components in the wastewater are generally difficult to remove during the wastewater treatment.
At present, chemical methods such as oxidation, micro-electrolysis and the like, physical-chemical methods such as coagulation, air flotation, adsorption and the like, and biochemical treatment technologies such as biological contact oxidation, anaerobic biological treatment and the like are mainly used for treating the wastewater, and the methods generally have the defects of low treatment efficiency, high investment cost, high operation cost and the like.
Disclosure of Invention
The invention aims to provide a process method for efficiently treating Lyocell short fiber wastewater on the basis of the prior art, and the process method has the characteristics of high operation efficiency and low cost.
The technical purpose of the invention is realized by the following technical scheme: a process method for efficiently treating Lyocell short fiber wastewater comprises the following steps: the method comprises the following steps: (1) carrying out primary oxidation pretreatment on wastewater containing Lyocell short fibers: adjusting the wastewater to be acidic at normal temperature, adding an oxidant and a cocatalyst into the reaction kettle, continuously stirring for reaction for 2-2.5 hours, adding liquid alkali into the wastewater for neutralization, and taking supernatant for further treatment;
(2) performing primary activated sludge biochemical degradation on the water sample treated in the step 1), building an activated sludge biochemical system according to an O + A/O + A/O process, gradually optimizing biochemical reaction process parameters, controlling the total retention time to be 127.5 hours, controlling the biochemical sludge reflux ratio to be 150%, controlling the sewage reflux ratio to be 150%, and collecting biochemical effluent;
(3) carrying out secondary oxidation treatment on the water sample treated in the step 2), and adding a cocatalyst O under the condition of normal temperature3Carrying out catalytic oxidation on the water sample, controlling the oxidation reaction time to be 80-120 minutes, and collecting the obtained water sample to enter the next step for treatment;
(4) performing secondary active sludge biochemical degradation on the water sample treated in the step 3), building an active sludge biochemical system through an A/O + A/O process, gradually optimizing biochemical reaction process parameters, controlling the total retention time to be 102 hours, the biochemical sludge reflux ratio to be 150 percent and the sewage reflux ratio to be 150 percent, and collecting biochemical effluent;
(5) carrying out deep oxidation treatment on the wastewater treated in the step 4), and adding a cocatalyst O under the condition of normal temperature3The water sample is subjected to catalytic ozonation, the oxidation reaction time is controlled to be 80-120 minutes, and the effluent can finally reach COD (chemical oxygen demand) less than or equal to50mg/L、TN≤15mg/L。
Preferably, the oxidant is H2O2Solution of said catalyst containing Fe2+And (3) solution.
Preferably, the Lyocell short fiber wastewater comprises morpholine, N-methylmorpholine and refractory organic nitrogen.
Preferably, the salt content of the Lyocell short fiber wastewater is more than 5000 mg/L.
Preferably, the content of the N-methylmorpholine is more than 1700 mg/L.
Preferably, the organic nitrogen content is 320mg/L or more.
In conclusion, the invention has the following beneficial effects: the COD of the inlet water of the Lyocell short fiber wastewater is more than or equal to 2800mg/L, the organic nitrogen is more than or equal to 320mg/L, and the COD of the outlet water treated by the process is less than or equal to 50mg/L, TN and less than or equal to 15 mg/L.
Detailed Description
The following examples further illustrate the invention in detail.
A process method for efficiently treating Lyocell short fiber wastewater comprises the following steps: (1) carrying out primary oxidation pretreatment on wastewater containing Lyocell short fibers: adjusting the wastewater to be acidic at normal temperature, and adding an oxidant and a cocatalyst into the reaction kettle, wherein the oxidant is H2O2A solution of a catalyst containing Fe2+Continuously stirring the solution for reaction for 2-2.5 hours, adding liquid alkali into the wastewater for neutralization, and taking the supernatant for further treatment;
(2) performing primary activated sludge biochemical degradation on the water sample treated in the step 1), building an activated sludge biochemical system according to an O + A/O + A/O process, controlling the total biochemical residence time to be 127.5 hours, controlling the biochemical sludge reflux ratio to be 150% and the sewage reflux ratio to be 150%, and collecting biochemical effluent;
(3) carrying out secondary oxidation treatment on the water sample treated in the step 2), and adding a cocatalyst O under the condition of normal temperature3Carrying out catalytic oxidation on the water sample, controlling the oxidation reaction time to be 80-120 minutes, and collecting the obtained water sample to enter the next step for treatment;
(4) performing secondary active sludge biochemical degradation on the water sample treated in the step 3), building an active sludge biochemical system through an A/O + A/O process, gradually optimizing biochemical reaction process parameters, controlling the total retention time to be 102 hours, the biochemical sludge reflux ratio to be 150 percent and the sewage reflux ratio to be 150 percent, and collecting biochemical effluent;
(5) carrying out deep oxidation treatment on the wastewater treated in the step 4), and adding a cocatalyst O at normal temperature3The water sample is subjected to catalytic ozonation, the oxidation reaction time is controlled to be 80-120 minutes, and the final effluent can reach COD (chemical oxygen demand) of not more than 50mg/L, TN and not more than 15mg/L, wherein the Lyocell short fiber wastewater comprises morpholine, N-methylmorpholine and refractory organic nitrogen, the salt content of the Lyocell short fiber wastewater is more than 5000mg/L, the N-methylmorpholine content is more than 1700mg/L, and the organic nitrogen content is more than 320 mg/L.
Examples
The COD concentration of the Lyocell short fiber wastewater is 2800mg/L, the TN concentration is 320mg/L, and the salt content is 5000 mg/L.
(1) First oxidation
Carrying out primary oxidation pretreatment on the Lyocell short fiber wastewater, and adding a certain amount of H under the normal temperature condition2O2、Fe2+Adding the mixed reagent into the wastewater, and reacting for 2-2.5 hours under the condition of continuous stirring; after the reaction is finished, adding alkali into the wastewater for neutralization to generate flocculation and precipitation so as to obtain a clear water sample, wherein the removal rate of COD is 6.43 percent and the removal rate of TN is 4.69 percent, and the main purposes of primary oxidation are to primarily reduce the toxicity of the wastewater, ammoniate organic nitrogen and improve the wastewater toxicityBiodegradability of (1).
(2) The method comprises the steps of building an activated sludge biochemical system according to an O + A/O + A/O process through a primary biochemical process, introducing a water sample obtained through primary oxidation into the biochemical system for primary biochemical degradation, gradually optimizing reaction process parameters, wherein DO in an A pool is less than 0.5mg/L, DO in an O pool is 3-5 mg/L, pH in the A pool is 6-7, reaction temperature is 27 ℃, total retention time of the A/O pool is 127.5 hours, reflux ratio of biochemical sludge is 150%, reflux ratio of sewage is 150%, COD removal rate is 52.29%, and TN removal rate is 54.1%.
(3) Secondary oxidation process
Collecting the first biochemical tail water, performing secondary oxidation treatment with a certain amount of O at normal temperature3Adding a certain amount of cocatalyst into an oxidant to perform high-efficiency catalytic oxidation on the water sample, wherein the oxidation reaction time is controlled to be 80-120 minutes, the COD removal rate is 13.6%, and the TN removal rate is 14.29%.
(4) Secondary biochemical process
An activated sludge biochemical system is built according to the process of 'A/O + A/O', a water sample obtained by secondary oxidation is connected into the biochemical system for secondary biochemical degradation, the biochemical reaction process parameters are gradually optimized, the DO of an A pool is less than 0.5mg/L, the DO of an O pool is 3-5 mg/L, the pH of the pool is 6-7, the reaction temperature is 27 ℃, the total retention time of the A/O pool is controlled to be 102 hours, the reflux ratio of biochemical sludge is 150%, the reflux ratio of sewage is 150%, the COD removal rate is 92.59%, and the TN removal rate is 87.5%.
(5) Tail water low-consumption catalytic ozone oxidation process
Collecting the secondary biochemical tail water, oxidizing with a certain amount of O at normal temperature3The water sample is subjected to low-consumption catalytic ozone oxidation by an oxidant, the oxidation reaction time is controlled to be 80-120 minutes, and the COD removal rate is 46.25%.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Water quality data in the steps (1) to (5) in the present example are shown in Table 1
TABLE 1
Claims (6)
1. A process method for efficiently treating Lyocell short fiber wastewater is characterized by comprising the following steps:
(1) carrying out primary oxidation pretreatment on wastewater containing Lyocell short fibers: under the condition of normal temperature, firstly adjusting the wastewater to be acidic, adding an oxidant and a cocatalyst into the reaction kettle, continuously stirring for reaction for 2-2.5 hours, adding liquid alkali into the wastewater for neutralization, and taking supernatant for further treatment;
(2) performing primary activated sludge biochemical degradation on the water sample treated in the step 1), building an activated sludge biochemical system according to an O + A/O + A/O process, gradually optimizing biochemical reaction process parameters, controlling the total retention time to be 127.5 hours, controlling the biochemical sludge reflux ratio to be 150%, controlling the sewage reflux ratio to be 150%, and collecting biochemical effluent;
(3) carrying out secondary oxidation treatment on the water sample treated in the step 2), and adding a cocatalyst O at normal temperature3Carrying out catalytic oxidation on the water sample, controlling the oxidation reaction time to be 80-120 minutes, and collecting the obtained water sample to enter the next step for treatment;
(4) performing secondary active sludge biochemical degradation on the water sample treated in the step 3), building an active sludge biochemical system through an A/O + A/O process, optimizing biochemical reaction process parameters, controlling the total retention time to be 102 hours, the biochemical sludge reflux ratio to be 150 percent and the sewage reflux ratio to be 150 percent, and collecting biochemical effluent;
(5) carrying out efficient deep oxidation treatment on the wastewater treated in the step 4), and adding a cocatalyst O at normal temperature3The water sample is subjected to catalytic ozonation, the time of oxidation reaction is controlled to be 80-120 minutes, and the COD of the effluent can be finally realized to be less than or equal to 50mg/L, TN and less than or equal to 15 mg/L.
2. The process for efficiently treating the Lyocell short fiber wastewater as claimed in claim 1The method is characterized in that the oxidant is H2O2Solution of said catalyst containing Fe2+And (3) solution.
3. The process for efficiently treating the Lyocell short fiber wastewater as claimed in claim 1, wherein the Lyocell short fiber wastewater comprises morpholine, N-methylmorpholine and refractory organic nitrogen.
4. The process method for efficiently treating the Lyocell short fiber wastewater as claimed in claim 1, wherein the salt content of the Lyocell short fiber wastewater is more than 5000 mg/L.
5. The process method for efficiently treating the Lyocell short fiber wastewater as claimed in claim 3, wherein the content of the N-methylmorpholine is 1700mg/L or more.
6. The process method for efficiently treating the Lyocell short fiber wastewater as claimed in claim 3, wherein the organic nitrogen content is more than 320 mg/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735861A (en) * | 2022-04-09 | 2022-07-12 | 常州大学 | Efficient treatment method for Lyocell fiber wastewater |
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| US4178239A (en) * | 1974-11-13 | 1979-12-11 | Union Carbide Corporation | Biological intermediate sewage treatment with ozone pretreatment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114735861B (en) * | 2022-04-09 | 2023-01-20 | 常州大学 | Efficient treatment method for Lyocell fiber wastewater |
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