CN102674519A - Preparation method of flocculant for sewage treatment - Google Patents

Abstract

The invention relates to a preparation method of a flocculant for sewage treatment. The flocculant is compounded from the raw materials, namely polyacrylamide, starch, sodium hypochlorite, sodium carboxymethyl cellulose, sodium silicate, potassium persulfate, sodium sulfite and water. The flocculant prepared by the method disclosed by the invention has the advantages of greenness, environment-friendly property, low cost, low dosage, fast flocculation speed, less sludge, convenience in use, safety and the like.

Description

A kind of WWT is with the preparation method of flocculation agent

 

Technical field

The present invention relates to the preparation method of composite flocculant, be a kind of water treatment specifically with environmental protection inorganic cheaply-preparation method of organic compound flocculation agent.

 

Background technology

In recent years, along with the fast development of China's national economy, the imbalance between supply and demand of water becomes increasingly conspicuous.Water shortage, water pollute life to the development of China's national economy and industrial and agricultural production and people constituted serious prestige rib.Waste water treating and reutilizing is the main path that solves the water crisis.Flocculation sedimentation is the economy of disposing of sewage, easy method.In flocculation sedimentation, the selection of flocculation agent is the most key.In flocculation agent, there are shortcomings such as dosage is big, moisture percentage in sewage sludge height in inorganic flocculating agent.And existing organic polymer coargulator, though can overcome above-mentioned deficiency, cost is higher.The preparation of high efficiency, low cost flocculation agent becomes one of focus that investigators pay close attention to for this reason.

Vestolen PP 7052 phthalein amine (Polyscrylamide) is called for short PAM; Molecular formula is: [CH2-CH (CONH2)] n is the wire high molecular polymer, and molecular weight is between 400-2000 ten thousand; The solid phase prod outward appearance is for white or have a little yellow powder; Liquid state is colourless thickness colloidal, and is soluble in water, is prone to when temperature surpasses 120 ℃ decompose.Bibliographical information is arranged, and the foreign study person finds that the degraded product of SEPIGEL 305 can be used as the nutritive substance of bacterium vital movement, and nutritive substance can promote the degraded of SEPIGEL 305 again conversely.Therefore become application one of flocculation agent widely the most, yet the monomer acrylic amide of SEPIGEL 305 is a kind of carcinogenic substance, how present many countries have reduced its application.

A large amount of practices show; Two or more flocculation agent is used through composite or a kind of composite flocculation agent of reaction formation; Then can overcome the deficiency of using single flocculation agent, realize having complementary advantages, and consumption be few, cost is low, efficient is high; Therefore, composite flocculation agent is the research emphasis and the developing direction of flocculation agent from now on.

 

Summary of the invention

The invention provides the technology of preparing of a kind of water treatment with inorganic-organic compound flocculation agent of high efficiency, low cost.

For realizing that the concrete technical scheme that the object of the invention adopted is:

A kind of WWT is characterized in that with the preparation method of flocculation agent, may further comprise the steps:

1) in 10g starch, add 100ml water, place stirrer, control rotating speed 150-250 r.p.m, 1 ℃ of temperature 90 scholar, 30 minutes postcooling of gelatinization are to room temperature;

2) be that the SEPIGEL 305 of 50-500 ten thousand is dissolved in the 75ml water with the 5g relative molecular mass; Adding concentration is 10% aqueous sodium hypochlorite solution 50ml; Control rotating speed 200 r.p.m states are after 8-12 minute earlier, and controlling rotating speed again is 100 r.p.m, at room temperature reacts 0.5-4 hour;

3) getting pH value is that 3-4, modulus are that the sodium silicate solution 500mL of 3.5-4 is in there-necked flask; And place thermostat water bath, with step 1), 2) prepared product add, add the 20g Xylo-Mucine simultaneously; Stirring and dissolving; When bath temperature reaches 70 ℃, add 0.001-0.003g Potassium Persulphate and 0.006-0.008g S-WAT as linking agent, water bath with thermostatic control reaction 5h promptly gets flocculant solution.

The present invention has selected said components proportioning and corresponding preparation parameter through a large amount of experiments.SEPIGEL 305 in the flocculant solution of the present invention is cationic superpolymer through the polyvinylamine that the Hofmann reaction generates; And starch is oxidized into the anionic superpolymer in the preparation process, so is combined into the polyamphoteric electrolyte with cancellated ultra-high molecular weight through effects such as ionic linkage, secondary valence bond power and machinery windings between superpolymer.In not only can charge neutrality waste water colloidal particle and particle with negative charge, and the reticulated structure of ultra-high molecular weight has bridging and net is caught effect, is prone to form big flocs unit with colloidal particle and particle, reaches significant flocculating effect.Starch and CMC 99.5 are the abundantest natural macromolecular materials of originating, owing in mixture, replaced part polyethylene amine with starch, cost can decline to a great extent.In addition owing in mixture, further adopted cellulose sodium carboxymethyl; It is the sodium salt of carboxymethyl cellulose ether, belongs to the anionic ether of cellulose, is easy to be dispersed in become transparent colloidal solution in the water; Can occur deposition during for 2-3 at pH value, meet polyvalent metal salt and also can react and deposition occurs.Therefore the flocculation agent that obtains has the broken glue ability of inorganic flocculating agent and the rapid flocculation of organic polymer coargulator concurrently.

Beneficial effect of the present invention is, prepared flocculation agent has environmental protection, advantage with low cost, in paper mill wastewater, uses CODcr is significantly reduced, and the microfibre recovery is high.In stone sewage, use the consumption that only needs 10-15g/m3, the turbidity that can make stone sewage is from reducing to about 60NTU greater than 20000NTU.This flocculation agent also can be used as and helps the filter retention aid in the papermaking, can effectively improve the retention of microfibre, reduces waste water load.

 

Embodiment

Below in conjunction with specific embodiment technical scheme of the present invention is described.

Embodiment 1:

1) in the 10g Tapioca Starch, add 100ml water, place stirrer, control rotating speed 150 r.p.m, 1 ℃ of temperature 90 scholar, 30 minutes postcooling of gelatinization are to room temperature;

2) be that 1,000,000 SEPIGEL 305 is dissolved in the 75ml water with the 5g relative molecular mass, add concentration and be 10% aqueous sodium hypochlorite solution 50ml, control rotating speed 200 r.p.m states are after 8 minutes earlier, and controlling rotating speed again is 100 r.p.m, at room temperature reacts 2 hours;

3) getting pH value is that 3-4, modulus are that 3.5 sodium silicate solution 500mL is in there-necked flask; And place thermostat water bath, with step 1), 2) prepared product add, add the 20g Xylo-Mucine simultaneously; Stirring and dissolving; When bath temperature reaches 70 ℃, add 0.001g Potassium Persulphate and 0.007g S-WAT as linking agent, water bath with thermostatic control reaction 5h promptly gets flocculant solution.

The waste water (CODcr=700mg/L, turbidity are 18000NTU, PH:8～9) that flocculation agent is got certain stone material factory factory experimentizes.Waste water was stopped in equalizing tank 4 hours,, and tentatively remove suspended substance bigger in the waste water with balanced water quality and quantity; Waste water after the balanced water quality gets into coagulation basin, stops 20min, adds above-mentioned flocculant solution according to the consumption of 10g/ m3, and water outlet COD can drop in the 79mg/L, and turbidity drops in the 60NTU.

Embodiment 2:

1) in the 10g tapioca flour, add 100ml water, place stirrer, control rotating speed 200 r.p.m, 1 ℃ of temperature 90 scholar, 30 minutes postcooling of gelatinization are to room temperature;

2) be that 5,000,000 SEPIGEL 305 is dissolved in the 75ml water with the 5g relative molecular mass, add concentration and be 10% aqueous sodium hypochlorite solution 50ml, control rotating speed 200 r.p.m states are after 10 minutes earlier, and controlling rotating speed again is 100 r.p.m, at room temperature reacts 1 hour;

3) getting pH value is that 3-4, modulus are that 3.8 sodium silicate solution 500mL is in there-necked flask; And place thermostat water bath, with step 1), 2) prepared product add, add the 20g Xylo-Mucine simultaneously; Stirring and dissolving; When bath temperature reaches 70 ℃, add 0.002g Potassium Persulphate and 0.008g as linking agent, water bath with thermostatic control reaction 5h promptly gets flocculant solution.

The waste water (CODcr=700mg/L, turbidity are 18000NTU, PH:8～9) that flocculation agent is got certain stone material factory factory experimentizes.Waste water was stopped in equalizing tank 4 hours,, and tentatively remove suspended substance bigger in the waste water with balanced water quality and quantity; Waste water after the balanced water quality gets into coagulation basin, stops 20min, adds above-mentioned flocculant solution according to the consumption of 10g/ m3, and water outlet COD can drop in the 79mg/L, and turbidity drops in the 60NTU.

Embodiment 3:

1) in the 10g Semen Maydis powder, add 100ml water, place stirrer, control rotating speed 250 r.p.m, 1 ℃ of temperature 90 scholar, 30 minutes postcooling of gelatinization are to room temperature;

2) be that 5,000,000 SEPIGEL 305 is dissolved in the 75ml water with the 5g relative molecular mass, add concentration and be 10% aqueous sodium hypochlorite solution 50ml, control rotating speed 200 r.p.m states are after 8 minutes earlier, and controlling rotating speed again is 100 r.p.m, at room temperature reacts 4 hours;

3) getting pH value is that 3-4, modulus are that 4 sodium silicate solution 500mL is in there-necked flask; And place thermostat water bath, with step 1), 2) prepared product add, add the 20g Xylo-Mucine simultaneously; Stirring and dissolving; When bath temperature reaches 70 ℃, add 0.003g Potassium Persulphate and 0.006g as linking agent, water bath with thermostatic control reaction 5h promptly gets flocculant solution.

The waste water (CODcr=700mg/L, turbidity are 18000NTU, PH:8～9) that flocculation agent is got certain stone material factory factory experimentizes.Waste water was stopped in equalizing tank 4 hours,, and tentatively remove suspended substance bigger in the waste water with balanced water quality and quantity; Waste water after the balanced water quality gets into coagulation basin, stops 20min, adds above-mentioned flocculant solution according to the consumption of 10g/ m3, and water outlet COD can drop in the 79mg/L, and turbidity drops in the 60NTU.

Need to prove that at last the above is merely preferred embodiment of the present invention, rather than to the qualification of technical scheme of the present invention, anyly be equal to replacement or corresponding improvement, still within protection scope of the present invention what technical characterictic of the present invention was done.

Claims (2)

1. a WWT is characterized in that with the preparation method of flocculation agent, may further comprise the steps:

1) in 10g starch, add 100ml water, place stirrer, control rotating speed 150-250 r.p.m, 1 ℃ of temperature 90 scholar, 30 minutes postcooling of gelatinization are to room temperature;

2) be that the SEPIGEL 305 of 50-500 ten thousand is dissolved in the 75ml water with the 5g relative molecular mass; Adding concentration is 10% aqueous sodium hypochlorite solution 50ml; Control rotating speed 200 r.p.m states are after 8-12 minute earlier, and controlling rotating speed again is 100 r.p.m, at room temperature reacts 0.5-4 hour;

3) getting pH value is that 3-4, modulus are that the sodium silicate solution 500mL of 3.5-4 is in there-necked flask; And place thermostat water bath, with step 1), 2) prepared product add, add the 20g Xylo-Mucine simultaneously; Stirring and dissolving; When bath temperature reaches 70 ℃, add 0.001-0.003g Potassium Persulphate and 0.006-0.008g S-WAT as linking agent, water bath with thermostatic control reaction 5h promptly gets flocculant solution.

2. a kind of WWT according to claim 1 is characterized in that with the preparation method of flocculation agent described starch is Tapioca Starch, Semen Maydis powder, tapioca flour or wheat-flour.