CN108083398B - Method for treating industrial wastewater - Google Patents
Method for treating industrial wastewater Download PDFInfo
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- CN108083398B CN108083398B CN201711289303.XA CN201711289303A CN108083398B CN 108083398 B CN108083398 B CN 108083398B CN 201711289303 A CN201711289303 A CN 201711289303A CN 108083398 B CN108083398 B CN 108083398B
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
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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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a method for treating industrial wastewater, which sequentially carries out hydrolytic acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, the flocculating agent added in the coagulating sedimentation treatment comprises poly dimethyl diallyl ammonium chloride, polyaspartic acid, quaternary ammonium salt, aluminum trichloride, acrylamide, polyaluminum ferric chloride, methacrylic acid diethylamine ethyl quinone, crude cassava powder, corncob powder and the like, can effectively treat high-concentration and high-turbidity wastewater and non-biochemical wastewater, can realize recycling of the treated water, has the COD removal rate of 80-90 percent and the BOD removal rate of 60-70 percent, the removal rate of heavy metals reaches more than 93 percent, and particularly, the method can effectively treat high-concentration and high-turbidity wastewater and non-biochemical wastewater, and the removal rate of SS and turbidity reaches more than 90 percent.
Description
Technical Field
The invention relates to a water treatment agent, in particular to a treatment method of industrial wastewater.
Background
Flocculation is one of the most common key links in wastewater treatment process, and influences the operation condition, final effluent quality and cost of the subsequent process to a great extent, thereby becoming an important scientific and technological research and development field in environmental engineering. An efficient flocculation technology system should be formed by combining three aspects of excellent flocculant, reactor and automatic control dosing, wherein the flocculant plays a core role. The key to the flocculation treatment technology is the selection of a suitable flocculant.
Flocculants are classified into various methods, and they are generally classified into inorganic flocculants, organic flocculants, and natural flocculants (e.g., bioflocculants) according to their compositions, and further classified into high-molecular, low-molecular, cationic, anionic, and nonionic flocculants according to their molecular weights, characteristics of functional groups, and properties of charges carried by the functional groups after dissociation. Wherein, the inorganic flocculant can be divided into two categories of aluminum salt system and iron salt system according to metal salt: the aluminum salt is mainly aluminum sulfate and aluminum chloride, and the ferric salt is mainly ferric sulfate and ferric chloride. The inorganic polymeric flocculant is a novel flocculant developed on the basis of traditional ferric salt and aluminum salt in the 60 th of the 20 th century, is a mainstream product and a main research direction of the inorganic flocculant, and mainly comprises polyaluminium sulfate, polyaluminium chloride, polyferric sulfate, polyferric chloride and the like. The inorganic polymer flocculant has better flocculation effect and lower corresponding price than the original traditional medicament, has been produced and applied in a considerable scale in Japan, Russia, Western Europe and China, and the production of the polymerization medicament accounts for 30-60% of the total amount of the flocculant.
The high-concentration industrial wastewater is different from domestic sewage and common industrial sewage, often contains various toxic and harmful refractory organic matters, heavy metal ions, ammonia nitrogen and other pollutants, has complex components, and the conventional flocculating agents such as polyaluminium, polyferric and the like have unsatisfactory treatment effect on the high-concentration wastewater due to single flocculation component, and particularly have poor effect on removing soluble pollutants in water. Therefore, for high-concentration wastewater, a flocculating agent which has the advantages of broad spectrum, high efficiency, good stability, strong specificity, excellent flocculation performance and moderate cost performance is still lacking at present.
Disclosure of Invention
In view of the above, the invention aims to provide a flocculant with broad spectrum, high efficiency, good stability, strong specificity, excellent flocculation performance and moderate cost performance, which is combined with a treatment method to improve the treatment effect of industrial wastewater.
The industrial wastewater treatment method comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
11-16 parts of poly dimethyl diallyl ammonium chloride, 5-10 parts of polyaspartic acid, 5-10 parts of quaternary ammonium salt, 4-8 parts of aluminum trichloride, 6-12 parts of acrylamide, 3-5 parts of polyaluminum ferric chloride, 5-10 parts of methacrylic acid diethylamine ethyl quinone, 1-3 parts of crude cassava powder, 1-3 parts of corncob powder, 2-5 parts of polysilicate aluminum ferric sulfate, 3-6 parts of vinyl trimethyl oxyalkyl, 1-3 parts of rare earth and 1-3 parts of polyvinyl chloride hollow spheres;
further, the flocculant raw material comprises the following components in parts by weight:
13 parts of poly dimethyl diallyl ammonium chloride, 7 parts of polyaspartic acid, 7 parts of quaternary ammonium salt, 6 parts of aluminum trichloride, 8 parts of acrylamide, 4 parts of polyaluminum ferric chloride, 7 parts of methacrylic acid diethylamine ethyl quinone, 2 parts of crude cassava powder, 2 parts of corncob powder, 3 parts of polysilicate aluminum ferric sulfate, 4 parts of vinyl trimethyl oxyalkyl, 2 parts of rare earth and 2 parts of polyvinyl chloride hollow spheres;
further, 0.1-1 part of initiator is also included;
further, the initiator is a mixture of azobisisobutyronitrile, ammonium persulfate and sodium sulfite.
The invention has the beneficial effects that: the industrial waste water treating process has flocculating, bridging and net trapping 3 processes, synergistic effect of the flocculant ions, both non-ionic functional group and cationic functional group embedded widely in the chain links of the macro molecule, and the flocculation of the solid particle through coordination and complexation, hydrogen bond association and van der Waals force. The industrial wastewater flocculant disclosed by the invention is short in flocculation precipitation time, good in effect and low in cost, improves the water molecule activity emulsifying power, degrades harmful substances and heavy metals of water, can be used for effectively treating high-concentration and high-turbidity wastewater and non-biochemical wastewater particularly, the treated water can be recycled, the COD removal rate reaches 80% -90%, the BOD removal rate reaches 60% -70%, the heavy metal removal rate reaches more than 93%, the high-concentration and high-turbidity wastewater and non-biochemical wastewater particularly can be effectively treated, and the SS and turbidity removal rate reaches more than 90%.
Detailed Description
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
11-16 parts of poly dimethyl diallyl ammonium chloride, 5-10 parts of polyaspartic acid, 5-10 parts of quaternary ammonium salt, 4-8 parts of aluminum trichloride, 6-12 parts of acrylamide, 3-5 parts of polyaluminum ferric chloride, 5-10 parts of methacrylic acid diethylamine ethyl quinone, 1-3 parts of crude cassava powder, 1-3 parts of corncob powder, 2-5 parts of polysilicate aluminum ferric sulfate, 3-6 parts of vinyl trimethyl oxyalkyl, 1-3 parts of rare earth and 1-3 parts of polyvinyl chloride hollow spheres; firstly, most of organic matters which are difficult to degrade are converted into organic matters which are easy to degrade through hydrolytic acidification reaction, then the organic matters which are easy to degrade are degraded through activated sludge reaction, a coagulating sedimentation tank is added after the activated sludge reaction, suspended solid matters, partial colloidal matters and partial macromolecular organic matters in the effluent of the secondary sedimentation tank are removed, and the biological aerated filter is prevented from being blocked. And (3) after coagulating sedimentation, treating the sewage by using a biological aerated filter, removing residual macromolecular organic matters in the effluent of the secondary sedimentation tank, and removing long carbon chain lipid substances and medium and small molecular organic matters in tail water. The final effluent can meet the first class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-2002). The flocculant molecules adopted have synergistic interaction, and the advantages of flocculants of different types and structures are exerted; the poly dimethyl diallyl ammonium chloride and the acrylamide have synergistic effect, the iron ions in the formula have flocculation promoting effect, flocs formed after the poly aluminum ferric chloride is added are compact and large in particles, sedimentation and removal are facilitated, and the defects are overcome by fully utilizing the synergistic principle among various metal ions and between the metal ions and other components while the excellent performance of flocculation treatment of the metal ions is exerted. The polyvinyl chloride hollow spheres are wrapped with bacteria to form a net-shaped floc which has the function of filtering wastewater and adsorbing and intercepting small particles and free bacteria in the wastewater; the polyaspartic acid has higher tolerance to calcium ions and has the performance of slow release and scale inhibition.
In the embodiment, the flocculant raw material comprises the following components in parts by weight:
13 parts of poly dimethyl diallyl ammonium chloride, 7 parts of polyaspartic acid, 7 parts of quaternary ammonium salt, 6 parts of aluminum trichloride, 8 parts of acrylamide, 4 parts of polyaluminum ferric chloride, 7 parts of methacrylic acid diethylamine ethyl quinone, 2 parts of crude cassava powder, 2 parts of corncob powder, 3 parts of polysilicate aluminum ferric sulfate, 4 parts of vinyl trimethyl oxyalkyl, 2 parts of rare earth and 2 parts of polyvinyl chloride hollow spheres.
In the embodiment, the paint also comprises 0.1-1 part of initiator; for enhanced clearance of turbidity.
In this embodiment, the initiator is a mixture of azobisisobutyronitrile, ammonium persulfate, and sodium sulfite.
Example one
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
11 parts of poly dimethyl diallyl ammonium chloride, 5 parts of polyaspartic acid, 5 parts of quaternary ammonium salt, 4 parts of aluminum trichloride, 6 parts of acrylamide, 3 parts of polyaluminum ferric chloride, 5 parts of methacrylic acid diethylamine ethyl quinone, 1 part of crude cassava powder, 1 part of corncob powder, 2 parts of polysilicate aluminum ferric sulfate, 3 parts of vinyl trimethyl oxyalkyl, 1 part of rare earth and 1 part of polyvinyl chloride hollow sphere.
The treated water can be recycled, the removal rate of COD reaches 80%, the removal rate of BOD reaches 70%, the removal rate of heavy metals reaches more than 93%, the treatment can be effectively carried out on high-concentration and high-turbidity wastewater and non-biochemical wastewater, and the removal rate of SS and turbidity reaches more than 90%.
Example two
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
16 parts of poly dimethyl diallyl ammonium chloride, 10 parts of polyaspartic acid, 10 parts of quaternary ammonium salt, 8 parts of aluminum trichloride, 12 parts of acrylamide, 5 parts of polyaluminum ferric chloride, 10 parts of methacrylic acid diethylamine ethyl quinone, 3 parts of crude cassava powder, 3 parts of corncob powder, 5 parts of polysilicate aluminum ferric sulfate, 6 parts of vinyl trimethyl oxyalkyl, 3 parts of rare earth and 3 parts of polyvinyl chloride hollow spheres.
The treated water can be recycled, the removal rate of COD reaches 85%, the removal rate of BOD reaches 65%, the removal rate of heavy metals reaches more than 93%, the treatment can be effectively carried out on high-concentration and high-turbidity wastewater and wastewater which cannot be biochemically treated, and the removal rate of SS and turbidity reaches more than 90%.
EXAMPLE III
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
11 parts of poly dimethyl diallyl ammonium chloride, 10 parts of polyaspartic acid, 5 parts of quaternary ammonium salt, 8 parts of aluminum trichloride, 6 parts of acrylamide, 5 parts of polyaluminum ferric chloride, 5 parts of methacrylic acid diethylamine ethyl quinone, 3 parts of crude cassava powder, 1 part of corncob powder, 5 parts of polysilicate aluminum ferric sulfate, 3 parts of vinyl trimethyl oxyalkyl, 3 parts of rare earth, 1 part of polyvinyl chloride hollow sphere and 0.1 part of initiator.
The treated water can be recycled, the removal rate of COD reaches 90%, the removal rate of BOD reaches 70%, the removal rate of heavy metals reaches more than 93%, the treatment can be effectively carried out on high-concentration and high-turbidity wastewater and wastewater which cannot be biochemically treated, and the removal rate of SS and turbidity reaches more than 90%.
Example four
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
16 parts of poly dimethyl diallyl ammonium chloride, 5 parts of polyaspartic acid, 10 parts of quaternary ammonium salt, 4 parts of aluminum trichloride, 12 parts of acrylamide, 3 parts of polyaluminum ferric chloride, 10 parts of methacrylic acid diethylamine ethyl quinone, 1 part of crude cassava powder, 3 parts of corncob powder, 2 parts of polysilicate aluminum ferric sulfate, 6 parts of vinyl trimethyl oxyalkyl, 1 part of rare earth, 3 parts of polyvinyl chloride hollow spheres and 1 part of initiator.
The treated water can be recycled, the removal rate of COD reaches 89%, the removal rate of BOD reaches 64%, the removal rate of heavy metals reaches more than 93%, the treatment can be effectively carried out on high-concentration and high-turbidity wastewater and wastewater which cannot be biochemically treated, and the removal rate of SS and turbidity reaches more than 90%.
EXAMPLE five
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
13 parts of poly dimethyl diallyl ammonium chloride, 5 parts of polyaspartic acid, 7 parts of quaternary ammonium salt, 8 parts of aluminum trichloride, 10 parts of acrylamide, 3 parts of polyaluminum ferric chloride, 6 parts of methacrylic acid diethylamine ethyl quinone, 3 parts of crude cassava powder, 2 parts of corncob powder, 2 parts of polysilicate aluminum ferric sulfate, 4 parts of vinyl trimethyl oxyalkyl, 3 parts of rare earth, 1 part of polyvinyl chloride hollow sphere and 0.5 part of initiator.
The treated water can be recycled, the removal rate of COD reaches 90%, the removal rate of BOD reaches 68%, the removal rate of heavy metals reaches more than 93%, the treatment can be effectively carried out on high-concentration and high-turbidity wastewater and wastewater which cannot be biochemically treated, and the removal rate of SS and turbidity reaches more than 90%.
EXAMPLE six
The method for treating the industrial wastewater comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
13 parts of poly dimethyl diallyl ammonium chloride, 7 parts of polyaspartic acid, 7 parts of quaternary ammonium salt, 6 parts of aluminum trichloride, 8 parts of acrylamide, 4 parts of polyaluminum ferric chloride, 7 parts of methacrylic acid diethylamine ethyl quinone, 2 parts of crude cassava powder, 2 parts of corncob powder, 3 parts of polysilicate aluminum ferric sulfate, 4 parts of vinyl trimethyl oxyalkyl, 2 parts of rare earth and 2 parts of polyvinyl chloride hollow spheres.
The treated water can be recycled, the removal rate of COD reaches 90%, the removal rate of BOD reaches 70%, the removal rate of heavy metals reaches more than 93%, the treatment can be effectively carried out on high-concentration and high-turbidity wastewater and wastewater which cannot be biochemically treated, and the removal rate of SS and turbidity reaches more than 90%.
In the above examples, the initiator is a mixture of azobisisobutyronitrile, ammonium persulfate and sodium sulfite.
In the above embodiment, in the aeration tank treatment step, the organic load is 0.045-0.205kgBOD5/(kgMLVSS.d), the hydraulic retention time is 13-15 hours, and the dissolved oxygen content in the aeration tank is 0.4-1 mg/L; in the step of treating the biological aerated filter, the filler is selected from activated carbon or ceramsite; the hydraulic retention time is 2-3 hours; the oxygen supply mode is external blast aeration, and the volume ratio of air to the water inflow of the industrial wastewater is 2-4L: 1L, and the pressure of the air is 1 standard atmospheric pressure.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (2)
1. A method for treating industrial wastewater is characterized by comprising the following steps: the method comprises the following steps: sequentially carrying out hydrolysis acidification treatment, activated sludge treatment, coagulating sedimentation treatment and biological aerated filter treatment on the industrial wastewater, wherein the flocculating agent added in the coagulating sedimentation treatment comprises the following raw materials in parts by weight:
11-16 parts of poly dimethyl diallyl ammonium chloride, 5-10 parts of polyaspartic acid, 5-10 parts of quaternary ammonium salt, 4-8 parts of aluminum trichloride, 6-12 parts of acrylamide, 3-5 parts of polyaluminum ferric chloride, 5-10 parts of methacrylic acid diethylamine ethyl quinone, 1-3 parts of crude cassava powder, 1-3 parts of corncob powder, 2-5 parts of polysilicate aluminum ferric sulfate, 3-6 parts of vinyl trimethyl oxyalkyl, 1-3 parts of rare earth, 1-3 parts of polyvinyl chloride hollow spheres and 0.1-1 part of initiator; the initiator is a mixture of azodiisobutyronitrile, ammonium persulfate and sodium sulfite; in the step of the biological aerated filter treatment, the organic load is 0.045-0.205kgBOD5/(kgMLVSS. mush.), the hydraulic retention time is 13-15 hours, and the dissolved oxygen content in the aeration tank is 0.4-1 mg/L; in the step of treating the biological aerated filter, the filler is selected from activated carbon or ceramsite; the hydraulic retention time is 2-3 hours; the oxygen supply mode is external blast aeration, the volume ratio of air to the water inflow of the industrial wastewater is 2-4L: 1L, and the pressure of the air is 1 standard atmospheric pressure.
2. The method for treating industrial wastewater according to claim 1, wherein: the flocculant comprises the following raw materials in parts by weight:
13 parts of poly dimethyl diallyl ammonium chloride, 7 parts of polyaspartic acid, 7 parts of quaternary ammonium salt, 6 parts of aluminum trichloride, 8 parts of acrylamide, 4 parts of polyaluminum ferric chloride, 7 parts of methacrylic acid diethylamine ethyl quinone, 2 parts of crude cassava powder, 2 parts of corncob powder, 3 parts of polysilicate aluminum ferric sulfate, 4 parts of vinyl trimethyl oxyalkyl, 2 parts of rare earth and 2 parts of polyvinyl chloride hollow spheres.
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