CN1919745A - Method of control town domestic sewage using magnetic polymers guided by fly ash and flocculant - Google Patents

Abstract

The invention discloses an urban living effluent harnessing method and flocculant of coal dielectric magnetic polymer, wherein the flocculant is composed of powdered coal ash, chitose and ferriferous oxide, which forms magnetic polymer; the powdered coal ash and magnetic polymer are put in the living effluent, which is stirred to produce obvious floccules; the magnetic material is added in the living effluent to remove floccules.

Description

The method of control town domestic sewage using magnetic polymers guided by fly ash and flocculation agent

Technical field

The invention belongs to a kind of waste water control method and flocculation agent thereof.

Background technology

For a long time, people think that always water is the resource of " inexhaustible, nexhaustible ".But the fact since nearly half a century shows, along with the mankind utilize to water resources that scope constantly enlarges, intensity constantly increases, to the demand of water in many countries and regions well beyond the output of water resources, even in the relatively abundanter countries and regions of those water resourcess, owing to when developing, utilizing water, also polluted water resources, the problem that the water quality type water resources lacks also occurred.China is the maximum country of world population, and along with the raising of the increasing suddenly of urban population, rural urbanization and living standards of the people, water requirement and total water requirements constantly increase per capita, and the municipal effluent total release is also corresponding thereupon to be increased gradually.This point, particularly evident since the nineties.1997, China's municipal wastewater quantity discharged was 18,900,000,000 m ³, wherein COD content is 68,400,000,000 tons.1999, China's city domestic sewage pollution load surpassed the industrial wastewater pollution load first, and the emphasis of China's water pollution control has been main control from industrial point source, is converted to the control based on city domestic sewage gradually.According to estimates, by 2010, China's city domestic sewage always discharged 1,050 hundred million m the most ³, wherein the villages and small towns quantity of wastewater effluent can reach 27,000,000,000 m ³Yet., the present city domestic sewage processing rate of China does not reach 10%. as yet according to the national economy and social development long-range objectives to the year 2010, and by 2010, the city domestic sewage processing rate will reach 50%.According to this requirement, a large amount of city domestic sewages have pending.Therefore, be badly in need of development, develop more economic, more efficient or more blanket town domestic sewage treatment technology.

At present, the method for the processing sanitary sewage of widespread use has biological process, membrane separation technique and enhanced primary treatment process:

Biological treatment process is meant that the metabolism that utilizes microorganism is converted into stable innoxious material to the organic pollutant of various solubilised state that exist in the sewage or colloidal state.This method is because of effluent quality is good, stink is little, operational flexibility is big, investment cost is low, occupation of land is less, controllability is good, and be widely used in extensive sanitary sewage disposal, but because technology is complicated, sludge quantity is big, anti-shock loading is relatively poor, energy consumption and working cost are higher.And the used microorganism active of this method is very responsive to envrionment conditionss such as temperature, makes the application of this method that the ground field selectivity be arranged.

Membrane separation technique is that the film that utilizes predetermined substance to make passes through solid-liquid separation mechanism, to removing pollutent and bacterium method original advantage is arranged, and this method is mainly used in sewage disposal on a small scale.

But because pollutent stops up the membrane pollution problem that causes, be difficult to overcome, make the embrane method cost of water treatment higher.

In recent years, along with the development and the application of the novel composite flocculating agent efficient, that the ecological safety performance is high, the enhanced primary treatment process was paid close attention to by people quite again aspect the middle small town sewage processing.But there are two problems in this method: one, be difficult in the low concentration sewage form than big flocculating body, and directly influence treatment effect; Two, immature on the solid-liquid separation technique, promptly be difficult to flco and water sharp separation, processing speed has greatly slowed down.

In addition, the increasing environmental pressure of another one is a flyash.Flyash is to be fuel with the coal, receives the thin ash of catching from flue gas, and the 5%-20% that its content accounts for coal-fired total amount is the main solid waste that the coal-burning power plant discharges.At present, the flyash annual emissions is about 500,000,000 tons in the world, and China's annual emissions is more than 1,000 ten thousand tons.Along with development of electric power industry, the flyash annual emissions increases day by day, and these flyash are deposited in storage ash field in a large number, have both polluted environment, have wasted resource again.In order to protect environment, to turn waste into wealth, since the seventies in 20th century, the comprehensive utilization of flyash is paid close attention to by countries in the world, becomes the first batch of object of the changing waste into resources of attracting attention the world today.But because economic condition and technical qualification is different, the utilize mode and the utilization ratio of various countries have bigger difference.The flyash of China uses in city-building mainly as the building industry material, and utilization ratio is lower, utilizes mode more backward relatively.

Summary of the invention

The object of the invention provides a kind of method and flocculation agent of control town domestic sewage using magnetic polymers guided by fly ash, quasi-solution two problems that traditional enhanced primary treatment process exists of determining: 1, low concentration sewage is difficult to form big flco, directly influences treatment effect; 2, solid-liquid separation technique is immature, and promptly flco and water sepn speed are slow, seriously reduce processing efficiency.

Technical scheme of the present invention is as follows:

A kind of method of control town domestic sewage using magnetic polymers guided by fly ash is characterized in that

(1), by every liter of sewage, in sewage, add following material:

A, flyash 10-40mg

The compound of b, chitosan and Z 250 wherein contains

Chitosan 2-10mg

Acetic acid 10-20 μ l

Z 250 5-25mg

(2), being stirred to obvious flocs unit occurs;

(3), outside sewage, apply magnetic field, water is separated with flco.

Described flyash granularity is less than 200 orders.

The flocculation agent of control town domestic sewage using magnetic polymers guided by fly ash is characterized in that by flyash, and the compound of chitosan and Z 250 composition, and its weight proportion is:

Flyash 10-40

Chitosan 2-10

Z 250 5-25

Chitosan and the Z 250 composite compound that forms in weakly acid soln wherein, flyash is placed separately.

Described flyash granularity is less than 200 orders.

Chitosan and Z 250 be the composite compound that forms in acetum.

Flyash is grey or linen volcano grey matter powdered material with lateral reactivity, has flocculence.Magnetic polymer is meant chitosan and magnetic (Z 250) compound according to the certain rule be combined in weakly acidic solution.Flyash, magnetic polymer synergy can and be fixed in the flco absorption such as the pollutent in the water body such as metallic particles thing, organism, harmful ion, can this flco be shifted out water body apace by external magnetic field then.The COD clearance is 68%; Turbidity reduces by 90%; Total nitrogen removes 56%; Total phosphorus removes 35%.

Present method innovation part is:

1. can make in the water body easier formation than big flocculating body, improve decontamination effect improving.

2. can make clear water (liquid) and flco after the processing (Gu) sharp separation, can improve processing efficiency, and stop may taking place of secondary pollution.Simultaneously, the flco that shifts out is reusable after drying, thereby reduces cost.

3. with useless pollution treatment, both improve the utilization of coal ash rate, reduced the consumption of flocculation agent chitosan again, reduced processing cost.

This method technology is simple, and cost economy has popularizing application prospect in fields such as town domestic sewage processing.

Embodiment

Get 1 liter of town domestic sewage, add earlier 10-40mg flyash (200 orders are following), add a certain amount of compound (chitosan of 2-10mg, the ferroferric oxide magnetic powder of 10-20 μ l acetic acid and 5-25mg) again, normal speed stirs 10-30 about second, to there being obvious flocs unit to occur; At last, externally-applied magnetic field 0.2-1 ton near water body, will see after 1-5 minute that water separates with flco, clear liquid is removed get final product.

Claims (5)

1, a kind of method of control town domestic sewage using magnetic polymers guided by fly ash is characterized in that

(1), by every liter of sewage, in sewage, add following material:

A, flyash 10-40mg

The compound of b, chitosan and Z 250 wherein contains

Chitosan 2-10mg

Acetic acid 10-20 μ l

Z 250 5-25mg

(2), being stirred to obvious flocs unit occurs;

(3), outside sewage, apply magnetic field, water is separated with flco.

2, method according to claim 1 is characterized in that described flyash granularity is less than 200 orders.

3, the flocculation agent of control town domestic sewage using magnetic polymers guided by fly ash is characterized in that by flyash, and the compound of chitosan and Z 250 composition, and its weight proportion is:

Flyash 10-40

Chitosan 2-10

Z 250 5-25

Chitosan and the Z 250 composite compound that forms in weakly acid soln wherein, flyash is placed separately.

4, flocculation agent according to claim 3 is characterized in that described flyash granularity is less than 200 orders.

5, flocculation agent according to claim 3 is characterized in that chitosan and the Z 250 composite compound that forms in acetum.