CN105923753A - Preparation and use methods of novel phosphorus removal medicament - Google Patents

Abstract

The invention provides a novel phosphorus removal medicament and a use method thereof. The phosphorus removal medicament is composed of pure elemental iron powder and aluminum powder, the weight ratio of the iron powder to the aluminum powder is (10-1):(5-1), the particle sizes of the iron powder and the aluminum powder are nanoscale sizes, and the mesh number is 300 mesh or above. The use method of the phosphorus removal medicament adopts of a dry feed mode, a screw feeder is used for directly adding the phosphorus removal medicament into an aerobic tank in a multi-point and scattered mode, for the dosage, 5-15 mg of phosphorus removal medicament is added to each liter of sewage, the aerobic tank can be a specific aerobic tank or an aeration section of a sequencing batch activated sludge process, for an oxidation ditch process regardless of time period and area, the medicament can be directly put into a biochemical pool, and dissolve oxygen of the aeration section and the biochemical pool is larger than 2 mg/L; according to the novel phosphorus removal medicament, efficient phosphorus removal to sewage is achieved, improvement of sludge settleability is promoted, and no adverse effect exits for total nitrogen and ammonia nitrogen removal.

Description

A kind of method of preparation and use of Novel dephosphorization medicament

Technical field

The invention belongs to sewage treatment area, be specifically related to a kind of Novel dephosphorization medicament and using method thereof.

Background technology

Biological phosphate-eliminating principle: waste water is in biological treatment, under anaerobic, the growth of polyP bacteria is suppressed, in order to certainly The growth of body just discharges the Quadrafos in its cell, produces simultaneously and utilizes in waste water needed for simple dissolubility organic substrate Energy, this process is called the release of phosphorus.After entering aerobic environment, vigor is thus capable of sufficiently recovering, and is making full use of substrate Meanwhile, from waste water, absorb the orthophosphate of a large amount of the dissolved, thus complete the process of poly-phosphorus.These are absorbed a large amount of phosphorus Microorganism is removed in form of a sludge from waste water, i.e. can reach the purpose of dephosphorization.There is the Sewage Plant of denitrogenation dephosphorizing function, Organic substance mainly consumes is releasing the aspects such as phosphorus, denitrification denitrogenation and heterotrophic bacteria growth.But, contained by general municipal sewage Degradable COD is limited, and in low-carbon-source sewage treatment system, the relatively low phenomenon of COD/TN ratio is the most prominent, VFAs content is the most extremely limited, and carbon source deficiency becomes denitrification and releases the limiting factor of phosphorus, so in biological carbon and phosphorous removal system In system, polyP bacteria and denitrifying bacterium produce competition because carbon source is not enough, affect removal effect, therefore under current flooded condition, Only by biological agent, dephosphorization efficiency is the most relatively low, is typically only less than 60%.

For improving the denitrogenation dephosphorizing efficiency of low-carbon-source sewage treatment system, lot of domestic and foreign scholar and engineer have carried out multinomial de- The research of nitrogen dephosphorization technique and application work, in general, the mode improving system dephosphorization efficiency has interior optimization, outside to add The many kinds of measures such as medicine, newly-increased engineering, but various arranging all also exists certain defect and drawback.Add chemistry salt dephosphorization agent: The one side that adds of a large amount of metallic salts causes the increase of cost, on the other hand brings introduction acid ion such as chloride ion in addition to make One-tenth biochemistry pool and plant equipment burn into cause biochemistry pool PH to reduce, sludge yield is big, effluent color dilution exceeds standard, the total ferrum of water outlet is total The problems such as aluminum exceeds standard, and actually limit due to the mechanism of action of chemical dephosphorization, under the phosphatic operating mode of low concentration, real Now to phosphatic deep removal, need to add the Dephosphorization reagent beyond chemical reaction mol ratio several times even more than ten times；

For general domestic sewage processing system, after biological phosphate-eliminating, overwhelming majority phosphorus exists with orthophosphate form, and Concentration is relatively low, most less than 2mg/L, generally below 1mg/L, for reaching the discharge standard of 0.5mg/L, so Under low orthophosphate concentration, add metallic salt dephosphorization agent dephosphorization and there is excess waste, the extraneous anion of introducing, go out The defects such as colority of water, burn into sludge output are excessive, especially for batch-type techniques such as SBR, CASS of not having second pond, The most fluffy chemical sludge directly adding aluminium salt and produce, may result in water outlet race mud and process load seriously reduces, Have a strong impact on the process water yield and water quality treatment is up to standard.Along with the raising of total phosphorus discharge standard, the extraordinary Dephosphorization reagent of exploitation becomes capable Industry trend.

CN104291420A discloses a kind of dephosphorization agent containing inorganic mineral, it is characterised in that include component A, component A It is made up of the raw material of following quality proportioning: aluminum contained compound 50～75%；Inorganic mineral adsorbent 15～30%；Iron content Compound 10～20%, above-mentioned aluminum contained compound is aluminium polychlorid, polyaluminium sulfate, PAFS, polyaluminium In ferro-aluminum any one；Above-mentioned inorganic adsorbent is bentonite, Kaolin, kieselguhr, brucite, convex Attapulgite, stratiform In potassium titanate any one；Above-mentioned iron containing compounds be ferrous sulfate, iron sulfate, iron chloride, ferrous chloride, ferrous nitrate, In ferric nitrate any one, in phosphorus-containing wastewater, the addition of dephosphorization agent is 0.3～0.6g/L.This invention uses iron salt and aluminium salt As dephosphorization agent, good effect is reached for the sewage disposal that water inlet total phosphorus content is higher, but for intaking total phosphorus content relatively Low sewage is up to standard, and effect is the most bad, and adding of slaine can cause substantial amounts of chemical sludge, have a strong impact on water quality reaching standard, And dephosphorization agent dosage is more, relatively costly.

Summary of the invention

For solving the problems referred to above, the present invention proposes a kind of Novel dephosphorization medicament, comprises iron powder and the aluminium powder of pure simple substance, iron powder and The weight ratio of aluminium powder is: the particle diameter of 10-1:5-1, iron powder and aluminium powder is micron order, and mesh number is more than 300 mesh.

The present invention also provides for the using method of a kind of Novel dephosphorization medicament, and described using method is to use the dry mode thrown, and uses Dephosphorization reagent multi-point adding, dispersion are directly added in Aerobic Pond by screw(-type) feeder, and dosage is that every liter of sewage adds 5～30mg Dephosphorization reagent, described Aerobic Pond can be sequencing batch active sludge aeration section or the most at times, the oxidation ditch process of not subregion Biochemistry pool, the dissolved oxygen of described aeration section and biochemistry pool be more than 2mg/L.

Preferably, described dosage is that every liter of sewage adds 5～15mg Dephosphorization reagent.The present invention also provides for a kind of Novel dephosphorization medicine The purposes of agent, is less than 10mg/L, the total phosphorus continuous batch process spent water based on Quadrafos for total phosphorus of intaking and processes.

The present invention also provides for pure simple substance iron powder and prepares the purposes of dephosphorization agent, and the particle diameter of described iron powder is micron order, and mesh number is 300 More than mesh, iron powder in dephosphorization agent weight ratio be 10-100%.

The present invention also provides for the preparation method of above-mentioned Dephosphorization reagent, pure simple substance iron powder and pure simple substance aluminium powder and individually deposits and transport, The particle diameter of iron powder and aluminium powder is micron order, and mesh number is more than 300 mesh, before use or use time by simple substance iron powder and pure aluminum Powder mix homogeneously, prepares Dephosphorization reagent, and wherein, the weight ratio of iron powder and aluminium powder mixing is: 10-1:5-1.

One of dephosphorization mechanism of the present invention: after the dephosphorization agent of micron level enters biochemistry pool, and between surrounding (medium) Occur chemistry or electrochemical action to cause the destruction of metal or rotten, electrochemical corrosion i.e. occurs.The corrosion of ferrum medium is exactly Utilize the numerous corrosion cell that ferrum medium itself is contained, make water-immersed ferrum medium generation electrochemical metal corrode, thus Separating out iron ion, owing to micron order dephosphorization agent has bigger surface area, thus reactivity is high, and response speed is fast, parameter Dephosphorization metal cation (iron ion and ferrous ion) concentration high, dephosphorization efficiency is high.

The two of dephosphorization mechanism of the present invention: after dephosphorization agent entrance system, it will a certain degree of biological corrosion occurs, participate in reaction Microorganism mainly comprise the microorganisms such as iron bacteria, sulfate reducting bacteria (SRB) and acid-producing bacteria (APB), its essence remain electricity Chemistry, mechanism remains and is utilizing biological acting on to generate iron ion and ferrous ion in galvanic element system.

The principle of both the above reaction corrosion mechanism dephosphorization can be summarized as:

${\mathrm{Fe}}^{3+}+{\mathrm{PO}}_4^{3-}\→{\mathrm{FePO}}_4\↓$

$3{\mathrm{Fe}}^{2+}+2{\mathrm{PO}}_4^{3-}\→{\mathrm{Fe}}_3{\left({\mathrm{PO}}_4\right)}_2\↓$

Beneficial effects of the present invention:

(1) the Novel dephosphorization agent of the present invention uses pure fe, aluminum as Dephosphorization reagent, it is achieved the efficient dephosphorization to sewage, And total nitrogen, ammonia nitrogen removal are had no adverse effects.

(2) the Novel dephosphorization agent of the present invention has the effect that enhanced biological processes concurrently, and has efficient, lasting, slow release, product The transport minimum, corrosion-free, easy of mud amount, conveniently the feature such as adding, can effectively improve sludge settling property, persistently adding can Effectively reduce cost.

(3) the Novel dephosphorization agent of the present invention can be effectively improved sludge settling property, to dissolved oxygen and nitrifier activity without bad shadow Ring.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is entered One step describes in detail, but the scope of protection of present invention is not limited to the scope that embodiment is expressed.

The preparation of embodiment 1 Novel dephosphorization agent and use

With certain treatment scale as 80000m³/ d, the sewage treatment plant using cyclic activated sludge system is objective for implementation, carries out productivity real Test.This cyclic activated sludge system flow process is as follows: sewage enters aeration settling pit after thickness grid pretreatment, and settling pit water outlet is entered Entering biochemical reaction tank, biochemical reaction tank is divided into 4 groups 8, and (implementing row 1 selects 1 group of 2 CASS pond therein for real Test group), use six periodic duty operations, 1h of wherein intaking, reaction 1h (start aeration, actual aeration after water inlet 0.5h Reaction has 1.5h), precipitate 1h, strain water (D)=1h.The precipitation water outlet of CASS biochemistry pool is discharged after eventually passing through ultraviolet disinfection.

Test started to end of day in July 8 from June 15, takes micron order mesh number and is 400 mesh iron powders and is 400 for micron order mesh number Purpose aluminium powder is uniformly mixed by the weight ratio of 10:1, uses the dry mode thrown, when CASS pond aeration selected by embodiment 1 Novel dephosphorization agent is directly thought that every liter of sewage adds the dosage of 10mg by section use screw(-type) feeder, and multi-point adding, dispersion are thrown Adding, in keeping aeration time period biochemistry pool, dissolved oxygen is more than 2mg/L.

Comparative example 1: compared with Example 1, changes by iron powder and aluminium powder as commercially available customary commercial iron chloride and chlorination in comparative example 1 Aluminium powder agent, adds concentration and controls at 50mg/L, and remaining embodiment is same as in Example 1；

Comparative example 2: compared with Example 1, in comparative example 2, the mesh number of iron powder and aluminium powder is 100 mesh, remaining embodiment with Embodiment 1 is identical；

Comparative example 3: compared with Example 1, does not add dephosphorization agent, and remaining embodiment is same as in Example 1；

The effect of embodiment 2 Novel dephosphorization agent

Every three days, take former water and embodiment 1, comparative example 1, comparative example 2, comparative example 3 process after the total phosphorus content of water outlet Comparing, total phosphorus content Ammonium Molybdate Spectrophotometric Method for Determination, concrete data are shown in Table 1；Water outlet total nitrogen in embodiment 1 is contained Amount compares with comparative example 3 system water outlet total nitrogen content, and concrete data are shown in Table 2；By the water outlet ammonia-nitrogen content in embodiment 1 Comparing with comparative example 3 water outlet ammonia-nitrogen content, concrete data are shown in Table 3.

Table 1

Table 2

Table 3

As it can be seen from table 1 for the water inlet relatively low sewage of total phosphorus concentration, embodiment 1 substantially dephosphorization effect than comparative example 1-3 Fruit will well or stable, comparative example 3 only by biological phosphate-eliminating, dephosphorization efficiency only 60%, it is impossible to stably reach one-level B discharge mark Standard, the water outlet total phosphorus of embodiment 1 is 0.43mg/L, dephosphorization efficiency nearly 82%, owing to it has slow release phosphorus removal functional, because of And relatively direct comparative example 1 dephosphorization efficiency adding high concentration iron salt and aluminium salt to be stablized, owing to its particle diameter is less, live in surface Property is higher, thus relative scale 2 has faster and better phosphor-removing effect；Going out of embodiment 1 is can be seen that from the data of table 2 Water total nitrogen content is close with the water outlet total nitrogen content of the comparative example 3 not adding dephosphorization agent, and total nitrogen content be there is no impact；From table 3 Data can be seen that the water outlet ammonia-nitrogen content of embodiment 1 is close with the water outlet ammonia-nitrogen content of the comparative example 3 not adding dephosphorization agent, Total ammonia nitrogen content be there is no impact, and during dephosphorization agent uses, it was observed that embodiment 1 can make sludge settling improve, The pH value of biochemistry pool is without substantially reducing.Illustrate that the Novel dephosphorization agent of the present invention has the effect of stability and high efficiency dephosphorization, and novel Denitrifier is not caused inhibitory effect by adding of dephosphorization agent, does not the most have undesirable effect water outlet ammonia nitrogen, this dephosphorization is described Agent, while efficient dephosphorization, does not has side effects, and can be effectively improved the settleability of mud.

The permanence operation of embodiment 3 Novel dephosphorization agent

Production application is carried out, from June, 2015 to 2016 4 equally with the sewage treatment plant in embodiment 1 for processing object Month, add this patent dephosphorization agent (micron order mesh number is 400 mesh iron powders) 20 tons altogether, amount to and process the water yield 400.58 ten thousand tons, Averagely adding concentration about 5mg/L, in the case of water inlet total phosphorus concentration is about 2mg/L, the average total phosphorus concentration of water outlet exists for a long time Between 0.3-0.5mg/L, it is achieved that stably reaching standard, reagent cost is about 0.03 yuan/m³, only common metal salt medicament becomes This 1/2, owing to this product has longer lasting dephosphorization function, thus product life-time service of the present invention can effectively reduce medicine Agent cost.

The announcement of book and teaching according to the above description, above-mentioned embodiment can also be entered by those skilled in the art in the invention Row change and amendment.Therefore, the invention is not limited in detailed description of the invention disclosed and described above, to some invented Modifications and changes should also be as falling in the scope of the claims of the present invention.

Claims (6)

1. a Novel dephosphorization medicament, it is characterised in that described Dephosphorization reagent comprises iron powder and the aluminium powder of pure simple substance, the weight ratio of iron powder and aluminium powder is: the particle diameter of 10-1:5-1, iron powder and aluminium powder is micron order, and mesh number is more than 300 mesh.

2. the using method of a kind of Novel dephosphorization medicament described in claim 1, it is characterized in that, described using method is to use the dry mode thrown, use screw(-type) feeder directly by Dephosphorization reagent multi-point adding, dispersion adds in Aerobic Pond, according to different water inlet total phosphorus concentrations, dosage is that every liter of sewage adds 5～30mg Dephosphorization reagent, described Aerobic Pond can be obligate Aeration tank, it is alternatively the aeration section for sequencing batch active sludge, for the most at times, the oxidation ditch process of subregion can directly not add at biochemistry pool, the dissolved oxygen of described aeration section and biochemistry pool is more than 2mg/L.

The using method of a kind of Novel dephosphorization medicament the most according to claim 2, it is characterised in that described dosage is that every liter of sewage adds 5～15mg Dephosphorization reagent.

4. the purposes of a kind of Novel dephosphorization medicament described in claim 1, it is characterised in that be less than 10mg/L, the total phosphorus continuous batch process spent water based on Quadrafos for total phosphorus of intaking and process.

The purest simple substance iron powder prepares the purposes of dephosphorization agent, it is characterised in that the particle diameter of described iron powder is micron order, and mesh number is more than 300 mesh, iron powder in dephosphorization agent weight ratio be 10-100%.

6. the preparation method of Dephosphorization reagent described in claim 1, it is characterised in that pure simple substance iron powder and pure simple substance aluminium powder are individually deposited and transport, before use or use time by simple substance iron powder and simple substance aluminium powder mix homogeneously, prepare Dephosphorization reagent.