CN105985147A

CN105985147A - Method for preparing fertilizer through sewage treatment

Info

Publication number: CN105985147A
Application number: CN201510067135.4A
Authority: CN
Inventors: 王志龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-02-10
Filing date: 2015-02-10
Publication date: 2016-10-05

Abstract

The invention discloses a method for preparing fertilizer through sewage treatment. The method comprises filtering domestic sewage through boiler soot to obtain clear water, adding a ferment 3 into the boiler soot with pollutants, and carrying out fermentation to obtain the fertilizer, wherein the boiler soot contains 30-60wt% of carbon and the balance silica, alumina and trace elements and has granularity of 0.2-2mm, straw is cushioned under the boiler soot, the filter layer has thickness of 400-800mm, the cushion layer thickness is in a range of 40-60mm, domestic sewage flows through the filter layer and the cushion layer from top to bottom at a rate of 10-30m/s, a fermentation temperature is in a range of 30-60 DEG C and fermentation time is 15 days or more.

Description

A kind of method of making manure by sewage treatment

Technical field

The invention belongs to sewage treatment area, fall within fertilizer preparation field.

Background technology

China's discharge every day industry and sanitary sewage about 200,000,000 tons, wherein more than 90% through any process, and direct polluted-water is more than 2,000,000,000 meters³.At present typical municipal sewage plant belongs to two stage treatment, with physics biochemical process and gravitational settling method as basic means, by the suspended material in the processing step removal water such as precipitation, aeration and colloidal substance.Because 99.9% (weight) is water in sewage, this treatment plant takes up an area huge, adds sewage transport engineering, and the cost making urban sewage treatment system is sufficiently expensive.Additionally, the pollutant-mineral nutrient being dissolved in sewage, the problem that draining still has nutrient loss and polluted-water cannot be removed through this two stage treatment.Tertiary treatment uses quartz sand, cobble etc. to filter for filter bed material, activated carbon adsorption, can solve this problem, but must periodically recoil and regenerate, and involve great expense, and the most up to the present, really put into operation is considerably less.

On the other hand, for improving crop yield, soil is used the chemical fertilizer that a large amount of price is expensive year after year, is caused soil compaction, dysplasia.

Another further aspect, for reducing atmospheric pollution, the boiler smoke that the whole nation is collected every year from the boiler exhaust gas burning coal cinder reaches tens million of ton, and these flue dust, in stacking, transportation, cause secondary pollution unavoidably.

Summary of the invention

Present invention aim to address the problems referred to above of prior art, it is provided that a kind of method utilizing boiler smoke process sewage to produce fertilizer.

The boiler smoke retaining dirt, for sanitary sewage is filtered to obtain water purification through boiler smoke, is added ferment 3 fermentation and prepares fertilizer by the method for the present invention.

The particularly preferred sewage of the method is first filled with air between filtering through boiler smoke, promotes the phosphoric acid salt crystallization being dissolved in sewage, and provides required dissolved oxygen content for later fermentation step, it is particularly advantageous that sewage is inflated through at least two-stage mixing wastewater with air.It addition, in order to remove bigger solid dirt in advance, can be by sewage first through a grid initial filter, ' grid mesh can be at 10 × 10-20 × 20mm, it is also possible to the comb formula device that spacing 5-15mm parallel metal bar is made.

The particularly phosphorus content of boiler smoke used by this method is 30-60% (weight), remaining main chemical compositions of ash is silicon dioxide, aluminium sesquioxide and part trace element, granularity 0.2-2 millimeter, the flue dust that the available grate firing boiler smoke evacuation burning coal cinder is collected, it be also possible to use Caulis et Folium Oryzae such as and makees flue dust bedding and padding.Preferred pad thickness 40-60 millimeter, filtering layer thickness 400-800 millimeter, sanitary sewage flows through filtering layer, bed course from top to bottom with the speed of 10-30 m/h.

The boiler smoke retaining dirt particularly can be added wood flour or sugar slag class height carbonizable substance by this method, make fermentation raw material contain:

Wood flour or sugar slag class height carbonizable substance 10-25% (weight)

No. 3 0.1-0.5% (weight) of ferment

Water 40-60% (weight)

Filtrate, bedding and padding, dirt 25-40% (weight) fermentation temperature 30-60 DEG C, fermentation time more than 15 days, particularly 15-20 days, to pitchy, odorless, bear white hair time prepare fertilizer, during fermentation stir 2-3 time.

The method device therefor of the present invention includes filter and mixed fermentation pond, particularly may also include gas and water mixer.

In a preferred scheme of the present invention, the equipment of the present invention includes the preliminary filter of band grid, multistage gas and water mixer, sewage is sent into from preliminary filter the pump of gas and water mixer, receive the cesspool of the sewage from gas and water mixer, equipped with the filter of boiler smoke filtering layer, sewage is sent into from cesspool the pump of filter, and contains the fermentation vat of the filtrate etc. retaining dirt taken out in filter.

Main advantages of the present invention are as follows:

1, the treatment of wastes with processes of wastes against one another, boiler smoke, sanitary sewage, wood flour etc. are all refuses, and cause environmental pollution, use boiler smoke filter sewage, both taken full advantage of waste material, and comprehensive control environment, existing social benefit, have an economic benefit again again.

2, becoming and give up as fertilizer, expand the source of manure, the fertilizer that this method is produced contains multiple nutritional components, it is also possible to improvement soil；

3, raw material sources are extensive, and cheaply, product fertilizer demand amount is big；

4, sewage is processed in quickly flowing, and efficiency is high, effective, and filter need not backwash, it is simple to operates and manages；

5, can take up an area few in the rivers floss holes Chu Jian sewage treatment plant of existing sewage by the present invention, device structure is simple, and efficiency is high, profitable, easily implements.

Below embodiment is further illustrated the present invention.

Label 1 is preliminary filter, and 2 is pump, and 3 is multistage suction-type aerator, 4 is cesspool, and 5 is pump, and 6 is pressure filter, 7 is mixed fermentation pond, and 8 is soil pipe, and 9 is pure water pipe, 11 is sewage inlet, and 12 is one-level air entry, and 13 is first order jet nozzle, 14 is secondary nozzle, 15 is three grades of nozzles, 16 be three grades of air entries 17 be level Four nozzle, 18 is two grades of air entries.

Embodiment 1

In existing day, the town domestic sewage floss hole of displacement about 2000 tons sets up treatment plant.The capital equipment needed has；Submerged sewage pump 2, pipeline pump 2；>=10 meters³Cesspool one；φ 2000 × h2600mm pressure filter 2；Filtering velocity takes 10-20 m/h；5 meters³Fermentation vat 6；(solid amount TS)≤1000 mg/litre of sewage inlet；TS≤50 mg/litre of draining, produces fertilizer 2-3 ton daily.

Embodiment 2

nullOne or more multistage suction-type aerator 3 is squeezed into by pump 2 after preliminary filter 1 initial filter of sanitary sewage band grid，Water repeatedly with the flow velocity of 15-20 meter per second from the nozzles at different levels 13 of device 3，14，15，17 ejections，Form eddy current，And produce negative pressure，By air from air entry 12，18，16 suck，Moment air water is sufficiently mixed，It is quickly completed oxygen transfer in water，Make dissolved oxygen (DO) >=6 mg/litre，Salt soluble in water is promoted to form insoluble salt compound，Multistage gas and water mixer 3 external diameter is more than diameter of conveying pipe，The longest only about 1 meter，Mixed water is to cesspool 4，Pressure filter 6 is squeezed into by pump 5，Filter 6 is built with the Caulis et Folium Oryzae bed course (Caulis et Folium Oryzae long 20-40 millimeter) of 40-60 millimeters thick and the boiler smoke filter course of 400-800 millimeters thick，Described filtrate is to burn the content that the grate firing boiler smoke evacuation of coal cinder collects to account for the boiler smoke of flue dust total amount 30-60%，Remaining main chemical compositions of ash is silicon dioxide、Aluminium sesquioxide and part trace element，Surmise 0.2-2 millimeter，Sewage from pump 5 flows through filtering layer from the top down with the filtering velocity of 10-30 m/h、Bed course，Due to contact、Cohesion、Permeation filtration、Membrane filtration and adsorption，Suspended material in sanitary sewage、Colloid substance and be partly dissolved material and be trapped、Absorption is in filtering layer，Discharge through drainage arrangement higher than the purification of two stage treatment，Send into water body or farmland，When filter differential pressure increases，After water outlet is reduced to a certain degree，It is considered as filtrate saturated，Not backwash，And be off giving water，After water is got rid of，By the filtrate in filter、Bedding and padding and dirt all send into mixed fermentation pond 7，Filtrate、Bedding and padding、Dirt accounts for fermentation raw material gross weight 25-40%，With the wood flour accounting for fermentation raw material gross weight 10-25% or sugar slag class height carbonizable substance and account for the ferment 3 of fermentation raw material gross weight 0.1-0. 5% and mix homogeneously，The water content making raw material accounts for the 40-60% of gross weight，It is heated to 30 DEG C with top fermentation，Stirring 1-2 time (is about needed 5-6 days) when 40-60 DEG C，Build with plastic foil，Within 15-20 days, become pitchy、Odorless、Nutriment in a fertilizer is prepared complete when bearing white hair、The fertilizer that fertilizer efficiency is steady and long.

Claims

1. a method for making manure by sewage treatment, is characterized in that through boiler smoke, sanitary sewage is filtered to obtain water purification, the boiler smoke retaining dirt adds ferment 3 fermentation and prepares fertilizer；Described boiler smoke phosphorus content 30-60% (weight), remaining main component of ash is silicon dioxide, aluminium sesquioxide and trace element, granularity 0.2-2 millimeter；Caulis et Folium Oryzae bedding and padding, filtering layer thickness 400-800 millimeter, bed course thickness 40-60 millimeter is used below described boiler smoke；Described sanitary sewage is with 10 The speed of-30 meter per seconds flows through filtering layer, bed course from top to bottom；Described fermentation temperature is 30-60 DEG C, fermentation time more than 15 days.

2. method as claimed in claim 1, is characterized in that first being filled with in sewage air, and then boiler smoke filters described Sewage.

3. method as claimed in claim 1, is characterized in that sewage is first through a grid or comb initial filter.

4. method as claimed in claim 1, is characterized in that the boiler smoke retaining dirt is added wood flour or sugar slag class is high Carbonizable substance, makes fermentation raw material contain: wood flour or sugar slag class height carbonizable substance 10-25% (weight) ferment No. 3 0.1-0.5% (weight) water 40-60% (weight) filtrates, bedding and padding, dirt 25-40% (weight).