CN100467397C - A kind of waste water treatment agent and preparation method thereof - Google Patents

Abstract

The invention relates to a waste water treatment agent and a preparation method thereof. The components of the treatment agent and their mass ratios are modified bentonite: aluminum oxide: silver = 100: 11-30: 0.2-0.8, the waste water treatment agent The preparation method is: (1) weighing according to the mass ratio of bentonite: fine carbon powder = 100: 3-7, and preparing modified bentonite by roasting method; (2) weighing according to the mass ratio of modified bentonite: aluminum = 100: 3-8 The aluminum salt is weighed, the modified bentonite is immersed in the aluminum salt aqueous solution, and the aluminum salt is converted into aluminum oxide by chemical reaction and high-temperature roasting; (3) according to the quality of modified bentonite: silver=100:0.2～0.8 Weigh the silver salt, immerse the product of the previous step in the silver salt aqueous solution, dry it and roast it at high temperature. The treatment agent has good adsorption, flocculation and catalytic degradation effects on organic pollutants and suspended matter in wastewater, is suitable for the treatment of various organic polluted wastewater, has low water treatment cost, and is easy to recycle and reuse.

Description

A kind of waste water treatment agent and preparation method thereof

technical field

The invention relates to a waste water treatment agent and a preparation method thereof.

Background technique

The increasingly prominent water pollution has destroyed the ecological environment, endangered the survival of animals and plants, affected people's health, and restricted the development of industrial and agricultural production, which has aroused widespread concern from the whole society. The development and use of new high-efficiency, low-toxicity, and cheap wastewater treatment agents has become one of the keys to solving water pollution problems, and its importance is obvious. For this reason, a large number of researches have been carried out at home and abroad, and a series of new water treatment agents and their preparation methods have been proposed. Chinese patent CN1046315 discloses "preparation method of bentonite composite water purifying agent (type I)", CN1055528 discloses "composite high-efficiency drilling mud wastewater treatment agent", CN1081160 discloses "high-efficiency adsorption water treatment", and CN1222603 discloses "printing and dyeing sewage decolorization and purification method and preparation thereof", CN1257839 discloses "a water purification method for oxidative flocculation solid-liquid separation", CN1319564 discloses "a natural composite water treatment agent", and CN1341568 discloses "modified lignosulfonic acid Salt multifunctional water treatment agent and preparation method thereof”, CN135627 discloses “a preparation method of natural bentonite sewage treatment material”, CN1428301 discloses “a kind of water treatment agent”, CN1535925 discloses “ferrate multifunctional water treatment Preparation of water treatment agent and decontamination technology", CN1539756 discloses "a method of using zinc, molybdenum and magnesium salts as water treatment agent", CN1559930 discloses "preparation and application of water treatment agent", CN156966 discloses "a A preparation method of an inorganic-organic composite bentonite wastewater treatment material" and so on. Each of these patented technologies has its own characteristics and application directions. However, due to the complexity and variability of water pollution, the existing water treatment agents are far from meeting the needs of environmental protection.

Contents of the invention

The object of the present invention is to provide a kind of waste water treatment agent and preparation method thereof, and this treatment agent has better adsorption, flocculation and catalytic degradation to the pollutant in printing and dyeing waste water, oil and gas field waste water and other organic polluted waste water, thereby produces obvious The treatment effect is simple, the preparation method is simple, the water treatment cost is low, and it is easy to recycle and reuse.

In the invention, the bentonite is modified by a charcoal-added roasting method to make it have larger porosity and surface area, thereby enhancing its adsorption capacity. Then, through chemical reaction and high-temperature roasting, the surface of the modified bentonite is loaded with aluminum oxide and metal silver particles with high adsorption capacity and high catalytic activity to prepare a waste water treatment agent.

A kind of waste water treatment agent, is made up of modified bentonite, aluminum oxide, silver, and the mass ratio of each component is:

Modified bentonite 100

Aluminum oxide 11～30

Silver 0.2～0.8

A preparation method for wastewater treatment agent, comprising the following steps in turn:

(1) Weigh according to the mass ratio of bentonite: fine carbon powder = 100:3-7, fully grind and mix the two, and roast in a muffle furnace at a temperature of 550-600°C for 2-3 hours to obtain modified Bentonite;

(2) According to the mass ratio of modified bentonite: aluminum=100:3～8, weigh the above-mentioned modified bentonite and aluminum salt, first prepare an aqueous solution of aluminum salt with a concentration of 10%～30%, then pour the above-mentioned modified bentonite Put it into it, shake it up and let it stand for 1-2 hours, add NH ₃ ·H ₂ O dropwise under stirring, adjust the pH value to about 10, dry it at 100°C, and then gradually raise the temperature to 400-500°C and heat-preserve and roast for 1 ~2 hours;

(3) Weigh the silver salt according to the mass ratio of modified bentonite: silver=100:0.2～0.8, first prepare a silver salt aqueous solution with a concentration of 1%～2.5%, and then immerse the roasted product of the previous step in it. drying, and then transfer to a muffle furnace to raise the temperature to 450-500° C., and keep it warm for 2 hours, so that the silver salt is converted into silver, and a waste water treatment agent of the present invention is obtained.

In the preparation method of the wastewater treatment agent of the present invention, the (1) step is weighed according to the mass ratio of bentonite: fine carbon powder=100:3～7, the two are fully ground and mixed, and the water is adjusted to make fine particles, and dried Then transfer to a muffle furnace with a temperature of 550-600°C and roast for 2-3 hours to obtain modified bentonite; in the second step, the modified bentonite: aluminum = 100:3-8 mass ratio, weigh the modified bentonite Bentonite and aluminum salts (such as aluminum sulfate, aluminum trichloride, etc.), first prepare an aluminum salt solution with a concentration of 10% to 30%, then pour the modified bentonite into it, shake well, and let it stand for 1 to 2 hours, then Add NH ₃ ·H ₂ O dropwise under stirring, adjust the pH value to about 10, convert the aluminum salt into aluminum hydroxide, dry it at 100°C, then gradually raise the temperature to 400-500°C and heat-preserve for 1-2 hours. Aluminum hydroxide is converted into aluminum oxide, and the mass ratio of the two components in the resulting calcined product is modified bentonite: aluminum oxide=100:11～30; step (3) presses modified bentonite: silver=100 : The mass ratio of 0.2～0.8 takes by weighing silver salt (such as silver nitrate etc.), is first prepared into the silver salt aqueous solution that concentration is 1%～2.5%, then immerses the roasting product of last step wherein, dries at 90 ℃, then Put it into a muffle furnace and heat up to 450-500°C, keep it warm for 2 hours, and convert the silver salt into silver, and then a kind of waste water treatment agent of the present invention is obtained, wherein the mass ratio of each component is modified bentonite:dioxide trioxide Aluminum: silver = 100: 11-30: 0.2-0.8.

The waste water treatment agent of the invention can be used for the treatment of printing and dyeing waste water, oil and gas field waste water, domestic sewage and other various organic polluted waste water.

Compared with the prior art, the present invention has the following advantages: (1) It has good adsorption, flocculation and catalytic degradation effects on organic pollutants and suspended solids in wastewater; The speed is faster and the effect is better; (3) the cost of water treatment is low; (4) it is easy to recycle and reuse.

Detailed ways

The present invention will be specifically described below based on examples.

Example 1

Prepare wastewater treatment agent of the present invention according to the following steps:

(1) According to the mass ratio of bentonite: fine charcoal powder = 100:4, weigh bentonite and fine charcoal powder, fully grind and mix the two, adjust water to make fine particles, dry at 100°C, and transfer to temperature Roasting in a muffle furnace at 550°C for 2 hours to obtain modified bentonite;

(2) According to the mass ratio of modified bentonite: aluminum=100:6.6, take the above-mentioned modified bentonite and aluminum sulfate, and prepare the aluminum salt solution with a concentration of 20%, pour the above-mentioned modified bentonite into it, shake well, Stand still for 2 hours, then add NH ₃ ·H ₂ O dropwise under stirring, adjust the pH value to about 10, convert the aluminum salt into aluminum hydroxide, dry at 100°C, and then gradually heat up to 450°C for 1 hour, aluminum hydroxide is converted into aluminum oxide, and the mass ratio of the two components in the resulting roasted product is modified bentonite: aluminum oxide=100:25;

(3) Take silver nitrate according to the mass ratio of modified bentonite: silver=100:0.5, and prepare it into a silver salt aqueous solution with a concentration of 1.5%, immerse the roasted product in the previous step, dry it at 90°C, and then transfer it to In the muffle furnace, the temperature is raised to 500° C. and kept for 2 hours, so that the silver salt is converted into silver, and the waste water treatment agent (A) is obtained, and the mass ratio of its components is modified bentonite: aluminum oxide: silver=100 :25:0.5.

Take 100mL of industrial dyes direct wool blue and direct pink 12B aqueous solutions with a concentration of 250mg.L ^-1 , put them in two 250mL beakers respectively, add a certain amount of the above-mentioned wastewater treatment agent (A), stir for 5-10 minutes, and let Place it for 4 hours or centrifuge at high speed, take the supernatant and measure its absorbance on a spectrophotometer to calculate the decolorization rate; measure its COD _Cr by the sealed tube method and calculate the COD removal rate, the results are shown in Table 1.

Table 1

dye Treatment agent dosage/g Decolorization rate/% COD removal rate/% Direct hair blue 0.20 98.0 89.1 Direct Rosé 12B 0.10 90.2 80.4

Take 100mL aqueous solution of methyl orange and methylene blue, indicators that are difficult to decolorize, put them in 250mL beakers respectively, add a certain amount of the above-mentioned wastewater treatment agent (A), stir for 5-10 minutes, let stand for 4 hours or centrifuge at a high speed, The supernatant was taken to measure its decolorization rate, and the results are shown in Table 2.

Table 2

indicator Concentration/mg.L^-1 Treatment agent (A) dosage/g Decolorization rate/% methyl orange 10 0.50 91.0 Methylene blue 200 0.50 99.5

Example 2

Press bentonite: the mass ratio of fine carbon powder=100:5, operate according to the method and the step of above-mentioned embodiment 1 (1), make modified bentonite particle; Press modified bentonite: the mass ratio of aluminum=100:4, Operate according to the method and steps of above-mentioned embodiment 1 (2); operate according to the method and steps of above-mentioned embodiment 1 (3) according to the mass ratio of modified bentonite: silver=100:0.75, promptly make wastewater treatment agent (B), the mass ratio of each component is modified bentonite: aluminum oxide: silver=100:15:0.75.

Take 100mL of industrial dyes with a concentration of 500mg.L ^-1 , such as direct sun-fast turquoise blue, direct acid-resistant bright red, direct dark blue, direct sky blue, direct dark smoke, direct acid-resistant bordeaux, etc., and put them in 6 beakers respectively. Amount of wastewater treatment agent (B), stirred for 5 to 10 minutes, left to stand for 4 hours or high-speed centrifuged, took the supernatant to measure the decolorization rate and COD removal rate, the results are shown in Table 3.

table 3

dye Treatment agent (B) dosage/g Decolorization rate/% COD removal rate/% direct light fast turquoise blue 0.50 99.8 93.5 direct acid resistant scarlet 0.50 97.2 92.8 direct dark blue 0.50 98.0 93.1 direct sky blue 0.50 96.9 90.7 direct deep smoke 0.50 97.2 96.0 direct acid resistant date red 0.50 92.6 89.2

Take 100mL of two kinds of drilling wastewater with complex components, high chroma and high COD, respectively, add a small amount of polymer flocculant, stir for 3 minutes, let stand for 10 minutes, then add 0.50g of wastewater treatment agent (B), and stir for 5 minutes , stand for 4 hours or high-speed centrifugation, take the supernatant to measure its COD removal rate. The results are shown in Table 4.

Table 4

water sample Processing effect Drilling wastewater 2 (dark black, containing various mud treatment agents, oils and suspended solids, etc., COD=783mg.L^-1) The flocs and particles settle quickly, the supernatant is colorless and transparent, and the COD removal rate is 90.6% Drilling wastewater 2 (brown black, containing various mud treatment agents, oils and suspended solids, etc., COD=1958mg.L^-1) The flocs and particles settle quickly, the supernatant is colorless and transparent, and the COD removal rate is 92.7%

Take 0.5g of wastewater treatment agent (B) to treat the direct pink 12B dye solution with a concentration of 250mg.L ^-1 , put the separated precipitate into a muffle furnace, keep it warm at 500°C for 1 hour, and obtain recovered wastewater after cooling treatment agent. The above-mentioned dye solution was repeatedly treated with the recovered wastewater treatment agent, and the relationship between the number of recovery times and the decolorization rate is shown in Table 5.

table 5

Recycling times 1 2 3 4 Decolorization rate/% 94.3 94.1 93.5 93.7

Claims (1)

1 A wastewater treatment agent, which is composed of modified bentonite, aluminum oxide, and silver. The modified bentonite is ground and mixed with bentonite and fine carbon powder at a mass ratio of 100:3~7, and heated at 550~600°C It is prepared by roasting at a certain temperature for 2 to 3 hours, and the mass ratio of each component is: Modified bentonite 100 Aluminum oxide 11～30 Silver 0.2～0.8, The wastewater treatment agent is prepared by the following preparation method: (1) according to the mass ratio of modified bentonite: aluminum = 100: 3 ~ 8, weigh modified bentonite and aluminum salt, and prepare a concentration of 10% ~ 30% Aluminum salt aqueous solution, then pour modified bentonite into it, shake well and let it stand for 1 to 2 hours, add NH ₃ ·H ₂ O dropwise under stirring, adjust the pH value to 10, dry at 100°C, and then gradually Heat up to 400～500° C. and heat-preserve and roast for 1～2 hours; (2) take the silver salt according to the mass ratio of modified bentonite: silver=100:0.2～0.8, and prepare the silver salt aqueous solution with concentration of 1%～2.5% earlier, Then immerse the roasted product of step (1), dry it at 90°C, then transfer it to a muffle furnace and raise the temperature to 450-500°C, and keep it warm for 2 hours to convert the silver salt into silver to obtain the wastewater treatment agent .