CN105330092A - Technology for processing transformer oil stains - Google Patents

Abstract

The invention relates to a technology for processing transformer oil stains. The technology comprises the following steps: carrying out solid-liquid separation to effectively prevent the obstruction phenomenon and apparatus damages appearing in the wastewater conveying process, removing suspensions by using a floater removal device, adding 10g of a flocculating agent to every cubic meter of wastewater, reacting for 30-40min, discharging wastewater to a microbial reaction tank, adjusting the pH value to 7-8, adding 15g of an inoculant to every cubic meter of the liquid, and standing for a weak. The technology improves the water treatment capacity and the quality of treated water, reduces the running cost, and promotes standard reaching discharge.

Description

A process for treating transformer oil pollution

technical field

The invention belongs to the technical field of microorganisms, and in particular relates to a process for treating transformer oil pollution.

Background technique

Transformer (Transformer) is a device that uses the principle of electromagnetic induction to change the AC voltage. With the widespread application of transformers, a large amount of electroplating wastewater generated by the production of transformers must be paid enough attention to. The main sources of electroplating wastewater include cleaning water for plating parts, The waste electroplating solution, the ground flushing water of the electroplating workshop and the wastewater produced by the surface treatment of the plated parts have complex components, generally containing heavy metal ions such as chromium, nickel, copper, zinc, gold, silver and cyanide, which are highly toxic and harmful to the environment. The destructive effect is huge.

The treatment methods of electroplating wastewater in the prior art are generally the following:

1. Solvent extraction method

Solvent extraction is a separation method that uses the difference in solubility of heavy metal ions in the organic phase and in water to concentrate heavy metals in the organic phase. The organic phase is also called extractant, and the common ones are tributyl phosphate, trioctylphosphine oxide, dimethylheptylacetamide, trioctylamine, primary amine, oleic acid and linoleic acid, etc. In addition, organic extractants, such as acetone and ethanol, are also widely used in metal speciation analysis. The solvent extraction method for treating heavy metal wastewater has simple equipment, easy operation, small extraction dosage, recyclable extractant, and low secondary pollution. It is a treatment method with great development potential.

2. Chemical precipitation method

The chemical precipitation method is based on the principle of solubility product, adding hydroxide, sulfide, carbonate, etc., so that heavy metal ions combine with hydroxide ions, sulfide ions, carbonate ions, etc. to form insoluble compounds. Although the process is relatively simple and the operation is relatively easy, this method is easily affected by the precipitant and environmental conditions, so that the concentration of the effluent cannot meet the discharge standard. In addition, if a large amount of waste residue generated by the reaction is not properly treated, secondary pollution is likely to occur, which does not conform to the principle of green environmental protection.

3. Ion exchange method

The ion exchange method is a process in which heavy metal ions and ion exchange resins undergo ion exchange, and the properties of the resin have a great influence on the removal of heavy metals. Commonly used ion exchange resins include cation exchange resins, anion exchange resins, chelating resins and humic acid resins. The ion exchange method selectively removes heavy metal ions, the process is simple, the operation is easy, and the removal effect is very good. Compared with the precipitation method and electrolysis method, the ion exchange method has certain advantages in the treatment of low-concentration wastewater, but this method is limited by the adsorption capacity of the resin, the influence of impurities in the wastewater, and the variety, output and cost of the exchanger. The pretreatment requirements of wastewater are relatively high, and the regeneration of ion exchange resin and the treatment of regeneration liquid are also difficult problems to solve.

4. Adsorption method

The adsorption method is essentially the adsorption of heavy metal ions on the active surface of the adsorbent. It is a method that uses the adsorption of porous solid substances to make heavy metal ions in wastewater adsorb on the surface of the solid adsorbent and remove them. The most commonly used adsorbent is activated carbon, but it is expensive, has a short service life, requires regeneration, and has high operating costs. In addition, the adsorption method has a wide range of applications in the treatment of heavy metal-containing wastewater and will not cause secondary pollution. However, the adsorption selectivity of the adsorbent for heavy metal ions is often not high, so it cannot be well promoted.

The Ministry of Environmental Protection requires the electroplating industry to discharge in accordance with GB21900-2008 "Electroplating Pollutant Discharge Standard". Conventional treatment methods are used to treat electroplating wastewater with complex components. In this way, the amount of drug dosage is large, the process repeats and produces a lot of sludge, the cost is high, and it is difficult to ensure the discharge of sewage up to the standard. Therefore, it is imminent to develop a method for removing transformer electroplating wastewater with low construction investment, low operating cost and high treatment efficiency.

Contents of the invention

The purpose of the present invention is to provide a process for treating transformer electroplating wastewater.

The present invention is realized by adopting the following technical solutions:

A process for removing transformer electroplating wastewater is characterized in that it comprises the steps:

(1) Solid-liquid separation of transformer electroplating wastewater can effectively prevent clogging and damage to equipment during wastewater transportation;

(2) Pass the liquid obtained in step (1) through a floating substance removal device to remove suspended substances. It can improve the processing efficiency in the subsequent process;

(3) Add the flocculant to the wastewater treated in step (2), and add it according to the ratio of 8g per cubic meter of wastewater, react for 40min, and dehydrate through a centrifuge;

(4) Discharge the wastewater treated in step (4) into the microbial reaction tank, adjust the pH value to 7-8, then add 15g of biological agent per cubic meter of liquid, and let it stand for a week.

The biological preparation is prepared as follows:

(1) Put peanut shells into a grinder, and pass through a 100-mesh sieve to obtain peanut shell powder after crushing;

(2) Cultivate Thiobacillus ferrooxidans, Alcaligenes faecalis, Thiobacillus thiooxidans, Pseudomonas aeruginosa and Aspergillus niger to a concentration of 1× ¹⁰⁷ cells/ml respectively, and then follow the 5:3 ratio: Mix at a volume ratio of 1:2:1 to obtain a mixed bacterial solution; mix the mixed bacterial solution and peanut shell powder evenly at a weight ratio of 1:1 to obtain a bacterial agent;

The Thiobacillus ferrooxidans is preferably Thiobacillus ferrooxidans CGMCC NO.0727 (see CN1375553A);

The Alcaligenes faecalis is Alcaligenes faecalis ATCC31555 (for example, refer to the literature Structural studies of anextracellularpolysaccharide (S-130) elaborated by Alcaligenes ATCC31555, CarbohydrateResearch, 1986);

The Thiobacillus thiooxidans is preferably Thiobacillus thiooxidans CGMCC NO.0759 (see CN1389564A);

The Pseudomonas aeruginosa is preferably Pseudomonas aeruginosa (Pseudomonasaeruginosa) ATCC15442;

The Aspergillus niger is preferably Aspergillus nige ( Aspergillus nige) CCTCCNo: M206034 (CN1924000 public use).

(3): Cultivate Scenedesmus obliquus to a concentration of 1×10 ⁵ /ml algae liquid

The Scenedesmus obliquus is preferably (Scenedesmusobliquus) CGMCCNo.8015 (see CN103484374A)

(4) Prepare the carrier:

The carrier consists of 15 parts of kaolin, 10 parts of chitosan, 10 parts of chitin, and 40 parts of water. The above-mentioned raw materials are added to the stirring reactor according to the parts by weight, stirred at 500 rpm for 10 minutes, left standing for 30 minutes, and placed Dry at 60°C to a moisture content of 5%.

Mix the bacterial liquid prepared in step (2), the algal liquid prepared in step (3) and the carrier prepared in step (4) according to the mass ratio of 2:2:3, stir evenly, and dry at 30°C until the water content is 10%. A biological agent is obtained.

The strains described in the present invention can be purchased from the General Microorganism Center (CGMCC) of the China Committee for Culture Collection of Microbial Cultures (CGMCC), the American Type Culture Collection (ATCC), and the China Agricultural Microbiology Culture Collection Center (ACCC).

The bacterial strains and algae described in the present invention can be obtained by conventional culture methods to obtain the required concentration of bacterial liquid or algae liquid, which is not an innovative point of the present invention, and will not be described one by one due to space limitations.

The flocculant is composed of the following components: 10 parts of diatomite, 8 parts of potassium permanganate, 7 parts of potassium persulfate, 10 parts of calcium oxide powder, and 9 parts of aluminum oxide.

Among the above flocculants, alkaline substances can adjust the pH value, provide alkaline conditions for wastewater treatment, and can precipitate Cu ²⁺ , Zn ²⁺ , Ni ²⁺ plasma. Activated alumina can be used for flocculation and adsorption of solid suspended matter, and persulfate has the property of coagulation aid, and can convert some heavy metal ions such as Ni ²⁺ into oxide precipitation under alkaline conditions. The oxidant can oxidize inorganic substances such as nitrite and cyanide, and has a good removal effect on COD, chromium, sulfur, etc. in wastewater. Using the above flocculants to achieve the best synergistic effect on wastewater.

In the composite bacterial agent of the present invention, various strains capable of forming dominant bacterial groups are formulated into high-efficiency microbial preparations, which are added to the wastewater treatment system in a certain amount to accelerate the degradation of pollutants by microorganisms, so as to improve the biological treatment efficiency of the system , to ensure the stable operation of the system. It contains a variety of microorganisms with excellent degradation ability to refractory pollutants. The strains are reasonably compatible, symbiotically coordinated, non-antagonistic, high in activity, large in biomass, and fast in reproduction. It is suitable for the treatment of transformer electroplating wastewater. Increase the amount and quality of treated water, reduce operating costs, and promote standard discharge.

detailed description

Example 1:

A process for removing transformer electroplating wastewater is characterized in that it comprises the steps:

(1) Solid-liquid separation of transformer electroplating wastewater can effectively prevent clogging and damage to equipment during wastewater transportation;

(2) Pass the liquid obtained in step (1) through a floating substance removal device to remove suspended substances. It can improve the processing efficiency in the subsequent process;

(3) Add the flocculant to the wastewater treated in step (2), and add it according to the ratio of 8g per cubic meter of wastewater, react for 40min, and dehydrate through a centrifuge;

(4) Discharge the wastewater treated in step (4) into the microbial reaction tank, adjust the pH value to 7-8, then add 15g of biological agent per cubic meter of liquid, and let it stand for a week.

The biological preparation is prepared as follows:

(1) Put peanut shells into a grinder, and pass through a 100-mesh sieve to obtain peanut shell powder after crushing;

(2) Cultivate Thiobacillus ferrooxidans, Alcaligenes faecalis, Thiobacillus thiooxidans, Pseudomonas aeruginosa and Aspergillus niger to a concentration of 1× ¹⁰⁷ cells/ml respectively, and then follow the 5:3 ratio: Mix at a volume ratio of 1:2:1 to obtain a mixed bacterial solution; mix the mixed bacterial solution and peanut shell powder evenly at a weight ratio of 1:1 to obtain a bacterial agent;

The Thiobacillus ferrooxidans is preferably Thiobacillus ferrooxidans CGMCC NO.0727 (see CN1375553A);

The Alcaligenes faecalis is Alcaligenes faecalis ATCC31555 (for example, refer to the literature Structural studies of anextracellularpolysaccharide (S-130) elaborated by Alcaligenes ATCC31555, CarbohydrateResearch, 1986);

The Thiobacillus thiooxidans is preferably Thiobacillus thiooxidans CGMCC NO.0759 (see CN1389564A);

The Pseudomonas aeruginosa is preferably Pseudomonas aeruginosa (Pseudomonasaeruginosa) ATCC15442;

The Aspergillus niger is preferably Aspergillus nige ( Aspergillus nige) CCTCCNo: M206034 (CN1924000 public use).

(3): Cultivate Scenedesmus obliquus to a concentration of 1×10 ⁵ /ml algae liquid

The Scenedesmus obliquus is preferably (Scenedesmusobliquus) CGMCCNo.8015 (see CN103484374A)

(4) Prepare the carrier:

The carrier consists of 15 parts of kaolin, 10 parts of chitosan, 10 parts of chitin, and 40 parts of water. The above-mentioned raw materials are added to the stirring reactor according to the parts by weight, stirred at 500 rpm for 10 minutes, left standing for 30 minutes, and placed Dry at 60°C to a moisture content of 5%.

Mix the bacterial agent prepared in step (2), the algae solution prepared in step (3) and the carrier prepared in step (4) according to the mass ratio of 2:2:3, stir evenly, and dry at 30°C until the water content is 10%. A biological agent is obtained.

The strains described in the present invention can be purchased from the General Microorganism Center (CGMCC) of the China Committee for Culture Collection of Microbial Cultures (CGMCC), the American Type Culture Collection (ATCC), and the China Agricultural Microbiology Culture Collection Center (ACCC).

The bacterial strains and algae described in the present invention can be obtained by conventional culture methods to obtain the required concentration of bacterial liquid or algae liquid, which is not an innovative point of the present invention, and will not be described one by one due to space limitations.

The flocculant is composed of the following components: 10 parts of diatomite, 8 parts of potassium permanganate, 7 parts of potassium persulfate, 10 parts of calcium oxide powder, and 9 parts of aluminum oxide.

Example 2

Take 1L of transformer electroplating wastewater in a beaker. The raw water indicators of the electroplating wastewater are: pH5.8, COD1753mg/L, Cr ⁶⁺ 6.37mg/L, Ni ²⁺ 68mg/L, Cu ²⁺ 39.5mg/L, Zn ²⁺ 212mg/L, NH ₃ -N50mg/L, according to the above method of Example 1, first solid-liquid separation-removal of suspended solids-flocculation-microbial reaction, after treatment, the results of various indicators of the upper liquid were measured as follows: pH8. 0, COD30.2mg/L, Cr6 ⁺ 0.008mg/L, Ni2 ⁺ 0.12mg/L, Cu2 ⁺ 0.07mg/L, Zn2 ⁺ 0.035mg/L, _NH3 -N1.21mg/L.

Example 3

The method prepared in Example 1 was used to treat the electroplating sewage of a transformer production factory, and the results are shown in Table 1 below.

Table 1

Before treatment (mg/L) After treatment (mg/L) Removal rate COD 1651 22.7 98.6% Cr6 ⁺ 19 0.007 99.9% NH ₃ -N 61 1.22 96.4% Ni ²⁺ 95 0.13 99.8%

Although the present case has been described in detail with general description and specific implementation above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (3)

1., for the treatment of a technique for transformer greasy dirt, it is characterized in that comprising the steps:

(1) solid-liquid separation is carried out to transformer electroplating wastewater;

(2) step (1) is obtained liquid by floating matter removal device removing suspended substance;

(3) waste water that step (2) processes is added flocculation agent, the ratio adding 8g according to every cubic metre of waste water is added, and reaction 40min, is dewatered by whizzer;

(4) waste water that step (4) processes is discharged to microbial reaction pond, adjustment pH value is 7-8, then adds biotechnological formulation 15g according to every cubic metre of liquid, leaves standstill one week;

Described biotechnological formulation is prepared as follows:

1) Pericarppium arachidis hypogaeae is put in pulverizer, cross 100 mesh sieves after pulverizing and obtain peanut hull meal;

2) by thiobacillus ferrooxidant, Bacillus foecalis alkaligenes, thiobacillus thiooxidans, it is 1 × 10 that Pseudomonas aeruginosa and aspergillus niger are cultured to concentration respectively ⁷the bacterium liquid of individual/ml, then mixes according to the volume ratio of 5:3:1:2:1, obtains mixed bacteria liquid; Mixed bacteria liquid and peanut hull meal are mixed according to the weight ratio of 1:1, obtains microbial inoculum;

3) scenedesmus obliquus being cultured to concentration is 1 × 10 ⁵the algae liquid of individual/ml

Described scenedesmus obliquus is (Scenedesmusobliquus) CGMCCNo.8015;

4) carrier is prepared:

Described carrier is by kaolin 15 parts, chitosan 10 parts, chitin 10 parts, 40 parts, water, and get above-mentioned raw materials according to parts by weight and add in stirred reactor, 500 turns/min stirs 10min, leaves standstill 30min, and being placed in 60 DEG C of oven dry to moisture contents is 5%;

5) by step 2) carrier prepared of the algae liquid prepared of the microbial inoculum prepared, step 3) and step 4) mixes according to the mass ratio of 2:2:3, and stir, 30 DEG C are dried to water content is 10%, obtains biotechnological formulation.

2. method according to claim 1, is characterized in that:

Described thiobacillus ferrooxidant is preferably thiobacillus ferrooxidant CGMCCNO.0727;

Described Bacillus foecalis alkaligenes is Bacillus foecalis alkaligenes ATCC31555;

Described thiobacillus thiooxidans is preferably thiobacillus thiooxidans CGMCCNO.0759;

Described Pseudomonas aeruginosa is preferably Pseudomonas aeruginosa ATCC15442;

Described aspergillus niger is preferably aspergillus niger CCTCCNo:M206034.

3. method according to claim 1, is characterized in that, described flocculation agent is composed of the following components: 10 parts, diatomite, 8 parts, potassium permanganate, Potassium Persulphate 7 parts, calcium oxide 10 powder, 9 parts, aluminum oxide.