Background technology
Modern society generates mass production sanitary wastewater and needs to handle.Most of sewage treatment plant uses activated sludge process
These waste water are handled, thus generate a large amount of sludge(Also referred to as excess sludge)It needs to be further processed.It has developed
Numerous sludge disposal technologies, with the minimizing of hope realization sludge, stabilisation, innoxious and recycling.
The moisture content of sludge from sewage treatment plant is high, and generally more than 95%.Correspondingly, the minimizing of sludge is generally led to
Dehydration is crossed to realize.Art methods generally comprise to sludge carry out it is quenched, be then dehydrated.Pass through quenched and machine at present
Tool is dehydrated, and the moisture content of treated sludge is generally between 60-80%, and this dramatically reduces its volume and quality.
One of ingredient of sludge is colloidal particle, has strong affinity with water, to hinder sludge dewatering.Sludge is quenched
Purpose is to destroy the structure of the colloidal particle, its water affinity is reduced, to improve sludge dewatering efficiency.Sludge is quenched used
Additive include flocculant and flocculant aid.Flocculant includes organic flocculant and inorganic flocculating agent.Organic flocculant includes
Such as cationic polyacrylamide, inorganic flocculating agent include such as molysite and aluminium salt.Flocculant aid is including such as flyash and contains
Calcium compound, such as calcium oxide and calcium hydroxide powder.
Chinese patent application CN1962496A discloses a kind of method of deeply dehydrating sludge, including quenched and dehydration two
Raw material containing Fe is added in sludge, raw material containing Ca is added again after reacting several minutes, if then reacting wherein quenched include for step
Dry minute.It is combined with machinery by chemistry, the moisture content of final sludge is below 60%.
Quenched flocculant and flocculant aid used are often with the addition of powder, and resulting dust is to execute-in-place
There are certain infringements by personnel.In addition, since pending amount of sludge is huge, often need that a large amount of flocculation is applied in combination
Agent and flocculant aid.It is applied in combination flocculant by intermittently operated and when flocculation helps takes time and effort, and is combined in a manner of composition
The problem of poor storage stability can be encountered when being helped using flocculant and flocculation.
Therefore, however it remains method of the exploitation for sludge quenched novel compositions and using can have excellent
Storage stability and easy to operate.
Specific implementation mode
In order to avoid doubt, any feature any other aspect for use in the present invention of one aspect of the present invention.Word
Language "comprising" be intended to mean that " comprising " and " Consists of " or " by ... constitute ".In other words, cited step or option
Need not be exhaustion.It should be noted that given example is intended to illustrate the present invention and be not intended in the following description
Limit the invention to those examples itself.
In addition in embodiment, or when expressly stated otherwise, the amount or reaction condition, material of material are indicated in this specification
Physical property and/or purposes whole numerical value be understood to word " about " modify.Unless otherwise defined, with format
The numberical range that " from x to y " is indicated is understood to include x and y.When more to describe with format " from x to y " for specific feature
When a preferred range, it will be understood that, all ranges for combining different endpoints are also expected.
Unless otherwise indicated, otherwise percentage noted in the disclosure is weight percentage.
Composition
The present invention the quenched composition of sludge include the alkaline suspension containing polyaluminium sulfate and containing bodied ferric sulfate with
The acid solution of the reaction product of silicate.
It has been found that the effect when handling the sludge of high-moisture percentage of the flocculant containing aluminium is preferable, but it is low aqueous handling
But become hindering factor when the sludge of rate.Within the scope of wider moisture percentage in sewage sludge, siliceous and iron flocculant can promote
Flocculation.Inventor wads a quilt with cotton it was unexpectedly observed that when existing simultaneously the flocculant containing aluminium in flocculation system with siliceous and iron flocculant
Solidifying effect significantly improves.It is not intended to stick to any theory, it has been recognised by the inventors that adjacent silicic acid molecule is dehydrated, being formed has silica
The polymer of key.It is combined into the chelates such as Si-O-Fe, Si-O-Al with iron and aluminium ion in turn, has flocculability to be formed
It can more preferably polymerizable medium form.Therefore, the alkaline suspension containing polyaluminium sulfate of the present composition with containing polymerizeing
When the acid solution of the reaction product of ferric sulfate and silicate meets in sludge, it will be hydrolyzed, be complexed, polymerize, precipitate
Reaction, generates a series of chelates.These chelates carry higher positive charge, can generate absorption to electronegative sludge colloid
It is acted on charge neutrality, makes its de- steady, aggregation, precipitation, enhance flocculation, consequently facilitating follow-up dehydration.
In a prioritization scheme, in composition the alkaline suspension containing polyaluminium sulfate with containing bodied ferric sulfate with
The weight ratio of the acid solution of the reaction product of silicate is 1:5-5:1, preferably 1:2-2:1, most preferably 1:1.It is excellent at another
In change scheme, include the acid of alkaline suspension and the reaction product containing bodied ferric sulfate and silicate containing polyaluminium sulfate
Property solution composition be arranged to kit, wherein the alkaline suspension containing polyaluminium sulfate with contain bodied ferric sulfate and silicon
The acid solution of the reaction product of hydrochlorate is positioned in a manner of spatially separated in kit.In a prioritization scheme, contain
The alkaline suspension for having polyaluminium sulfate and the acid solution of the reaction product containing bodied ferric sulfate and silicate are stored in not
With in vessel.In another prioritization scheme, the setting of vessel allows to serially or simultaneously add containing polyaluminum sulfate
The acid solution of the alkaline suspension and the reaction product containing bodied ferric sulfate and silicate of aluminium.
The sludge texturing gagents box of the present invention optionally includes operation instructions.
Alkaline suspension
The composition quenched for sludge of the present invention contains alkaline suspension, and the suspension contains polyaluminium sulfate, is selected from
The alkali of sodium hydroxide, potassium hydroxide, calcium oxide, calcium hydroxide, barium hydroxide, magnesia, magnesium hydroxide, sodium metasilicate or potassium silicate
Property substance and emulsifier.The pH value of the suspension is 7-14, preferably 9-13, more preferable 10-12.
Total weight wherein based on alkaline suspension, polyaluminium sulfate with 1-30%, preferably 5-25%, most preferably 10-20%'s
Amount exists.Based on the total weight of composition all components, aluminium content is with Al2O3It is calculated as >=1%, preferably 5-10%.
Alkaline matter is selected from sodium hydroxide, potassium hydroxide, calcium oxide, calcium hydroxide, barium hydroxide, magnesia, hydroxide
Magnesium, sodium metasilicate or potassium silicate.More preferably use sodium hydroxide or potassium hydroxide.Based on the total weight of alkaline suspension, basic species
Matter exists with 10-40%, preferably 10-30%, the amount of more preferable 10-15%.
Based on the total weight of alkaline suspension, emulsifier exists with 0.1-10%, the amount of preferably 5-10%.It is suspended for alkalinity
The emulsifier of liquid is one or more in anionic, cationic and nonionic emulsifier.Anionic emulsifier
Can be such as aliphatic sulfonate, aromatic sulphonate, alkyl sulfate, alkyl ether sulfate, C8-C22Mono-alkyl succinic acid salt and
Maleate, sulfosalicylic acetate and acyl isethinate.Nonionic emulsifier can be for example aliphatic (C8-C18) straight chain
Or branched-chain primary alcohol or secondary alcohol or the condensation product of phenols and oxyalkylene, alkyl polyglycoside, sugared fatty acid amide and long-chain tertiary amine oxide.Sun
Ionic emulsifying agent can be such as cetyltrimethylammonium chloride and chlorination behenyl ammonium.It is preferable to use fat
Race's sulfonate.
Acid solution
The composition quenched for sludge of the present invention contains acid solution, and the solution contains by bodied ferric sulfate and silicate
Reaction product made of reaction, wherein silicate are selected from alkali and alkaline earth metal ions silicate.The pH value of the solution is 1-5,
It is preferred that 2-3.
Silicate is preferably selected from sodium metasilicate, potassium silicate, magnesium silicate, alumina silicate, aluminium-magnesium silicate or calcium silicates.More preferably use
Sodium metasilicate or potassium silicate.
The silicone content of the reaction product of bodied ferric sulfate and silicate is with SiO2It is calculated as 0.1-10%, preferably 1-5%;And iron
Ion concentration is 5-11%, preferably 6-9%.The reaction product of total weight based on acid solution, bodied ferric sulfate and silicate with
The amount for being changed to 1-10% exists.
Method
On the other hand, the invention further relates to the method that the present composition is used for Treatment of Sludge, the method includes steps
Suddenly:(i)Make sludge and composition(A)Alkaline suspension mixing;(ii)Make sludge and composition(B)Acid solution mixes;
With(iii)Make sludge dewatering.Step(i)And step(ii)It can be with reversed order.
Based on mud dry weight, alkaline suspension and acid solution respectively with 10-30%, preferably 15-25%, most preferably 18-20%'s
Amount is mixed with sludge.For example, by stirring, sludge is made to be uniformly mixed with alkaline suspension and acid solution.
Sludge dewatering is carried out for example, by filter press, such as plate and frame filter press.The moisture content of obtained sludge filter cake can be low
To about 30%.Sludge cellular water typically constitutes from the 40% of sludge weight, cannot directly be removed by mechanical dehydration, such as press filtration.This
Invention obtains the sludge filter cake moisture content down to about 30% it is meant that partial sludge cellular water has been detached, this can give the credit to completely
In the use of the present composition.
Since kit of the present invention is by alkaline suspension and the spatially separated setting of acid solution, avoid due to
The resolution problem caused by potential reaction between each ingredient, to significantly improve the storage stability of kit.Meanwhile
Since the flocculant quenched for sludge and flocculant aid use in liquid form, avoid using the adjoint powder of powder reagent
Dustiness contaminate, and liquid be easier to metering and it is more fully mixed with sludge.Therefore, the examination quenched for sludge of the invention
The advantage that agent box and application method have storage stability excellent and easy to operate.
The present invention now is further illustrated by means of following non-limiting embodiment.
Embodiment
It is prepared by alkaline suspension
Alkaline suspension has consisting of, wherein each Ingredient Amount is in terms of weight %:
|
Suspension 1 |
Suspension 2 |
Suspension 3 |
Suspension 4 |
Polyaluminium sulfate 20wt% solution |
10 |
15 |
20 |
25 |
Sodium hydroxide |
10 |
- |
18 |
20 |
Potassium hydroxide |
- |
15 |
18 |
25 |
Sodium alkyl benzene sulfonate |
0.6 |
- |
1.5 |
2.5 |
Polysorbate |
- |
1.5 |
2.5 |
3.5 |
Water |
Surplus |
Surplus |
Surplus |
Surplus |
* polyaluminium sulfate is purchased from Hubei development Chemical Co., Ltd..
Water, polyaluminum sulfate aluminum solutions and alkaline matter are added with upper table amount shown in mixer, at room temperature, slowly added
Enter emulsifier, stirs 4 hours.Obtain alkaline suspension.
Acid solution has consisting of, wherein each Ingredient Amount is in terms of weight %:
|
Acid solution 1 |
Acid solution 2 |
Acid solution 3 |
Acid solution 4 |
Polymeric ferrous sulphate solution |
60 |
65 |
70 |
75 |
Sodium metasilicate 10wt% solution |
10 |
- |
5 |
10 |
Potassium silicate 10wt% solution |
- |
10 |
5 |
5 |
Dilute sulfuric acid (20wt%) |
10 |
- |
5 |
10 |
Water |
Surplus |
Surplus |
Surplus |
Surplus |
* polymeric ferrous sulphate solution, purchased from Hengyang City Shanghai with building materials chemical industry Co., Ltd.
At room temperature, sodium metasilicate and/or potassium silicate solution are added in mixer with upper table amount shown, sulfuric acid is then added
And polymeric ferrous sulphate solution, it stirs 4 hours, obtains acid solution.
After prepared alkaline suspension 1-4 and acid solution 1-4 stores 7 and 14 days at room temperature, find to divide
Layer and precipitation.
By alkaline suspension 1 and acid solution 2 with 1:1 weight ratio is stored in different vessels room, forms kit 1.
Similarly, by alkaline suspension 2 and acid solution 1 with 1:1 weight ratio is stored in different vessels room, forms kit 2;It will
Alkaline suspension 3 and acid solution 3 are with 1:1 weight ratio is stored in different vessels room, forms kit 3.
The application of kit