CN103130396A

CN103130396A - Sludge modification method

Info

Publication number: CN103130396A
Application number: CN2013100770280A
Authority: CN
Inventors: 龚代高
Original assignee: SHAOXING ENO ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Current assignee: SHAOXING ENO ENVIRONMENTAL PROTECTION TECHNOLOGY Co Ltd
Priority date: 2013-03-11
Filing date: 2013-03-11
Publication date: 2013-06-05

Abstract

The invention relates to a method for modifying soil and in particular relates to a sludge modification method. The sludge modification method comprises the following steps of: mixing the following materials in parts by weight: 3-5 parts of boiler flue dust and 1-2 parts of slaked lime; preparing the mixture of the two into 5%-10% of aqueous solution; stirring the prepared solution and the sludge in a coagulation barrel to carry out coagulation-flocculation reaction, wherein the reaction time is 3-5 minutes, the rotation speed of the coagulation barrel is 30 revolutions/min to 60 revolutions/min, 0.1%-0.3% of PAM (Polyacrylamide) solution is added during the stirring process; and the solution is treated by a belt filter press or a plate-and-frame filter press. The sludge modified by the sludge modification method disclosed by the invention has a moisture content of 70%-75% and is easier to form. Moreover, the materials are environment-friendly, and the sludge is easily reduced.

Description

A kind of sludge modification method

Technical field

The present invention relates to a kind of method of soil modification, especially a kind of sludge modification method.

Background technology

Sludge water has four kinds of main existence forms.

Interstitial water: the free-water in the particle gap, approximately 70%, can separate by gravitational settling (concentrated densification);

Capillary water: be the water around the tiny mud granule at highly dense, formed by capillary phenomenon, approximately 20%, can be by applying the external force such as centrifugal force, negative pressure, destroy the reactive force of capillary sheet surface tension and cohesive force and separate;

Surface adsorption water: mud often is in colloidal state, and for example active sludge belongs to gel, and the colloidal solid of mud is very little, and specific surface area is large, therefore the surface tension effects adsorption moisture is more.

Inner/in conjunction with water: a part of sludge water is enclosed in the microbial cell film, forms the internal junction Heshui.

Surface adsorption water and account for 10% of moisture in mud in conjunction with water, all kinds of capillarys account for 20% of moisture total amount in mud in conjunction with water, and interstitial water accounts for 70% of sludge water content total amount.

Present full biochemical sludge treatment plant, basically mud is all active sludge, when doing sludge treatment, moisture percentage in sewage sludge is in 80% left and right so, and what have is even higher, so when sludge treatment, easy-formation, for the water ratio of reduce mud, will not carry out processed, this need to consume more substantial flocculation agent and electric energy, certainly will increase like this running cost of sewage work.

Summary of the invention

The object of the invention is to, but a kind of sludge modification method of low-cost processes mud, environmental protection utilization of waste material is provided.

The technical solution adopted for the present invention to solve the technical problems is: a kind of sludge modification method, and its method is as follows:

The first step: add entry after the white lime that boiler flue dust and the weight item that with weight item is 3-5 part is 1-2 part mixes, make the solution that concentration is 5%-10%;

Second step: the solution that makes and active sludge are put into the coagulation bucket stir coagulating, churning time is 3-5 minute, controls coagulation bucket rotating speed and be 30 to turn/min-60 turns/min, and adding concentration in the time of stirring is 1 ‰-3 ‰ PAM lysate;

The 3rd step: the mud that second step is obtained, process through belt filter press or plate-and-frame filter press, obtain the mud after modification.

The further setting of the present invention is: in second step, the mixed weight ratio of solution and active sludge is 1:3, and churning time is 4 minutes, and coagulation bucket rotating speed is 50 to turn/min.

The further setting of the present invention is: in second step, the concentration of PAM lysate in unitary fluid is 0.5 ‰-1 ‰.

The further setting of the present invention is: in the first step, mixed weight part ratio of boiler flue dust and white lime is 5:2.

aforesaid method, utilize weight item to add entry for the white lime of 1-2 part after mixing for the boiler flue dust of 3-5 part and weight item, make the solution that concentration is 5%-10%, this solution is to active sludge, carry out active effect and cram the capillary space of mud, reduce the content of water, white lime can conditioning of mud pH value, also has certain sterilization and disinfection effect, the generating portion precipitation of calcium carbonate, water-content in further reduce mud, add the PAM lysate when stirring, utilize the effect of PAM lysate, mud is further dewatered, the moisture percentage in sewage sludge after modification of the present invention that makes only has 70%-75%, easier moulding, and raw material ratio is than environmental protection, make easily mud decrement.

Embodiment

A kind of sludge modification method of the present invention, its method is as follows:

The first step: boiler flue dust and the weight item that with weight item is 3-5 part is to add entry after the white lime of 1-2 part mixes arbitrarily, make the solution that concentration is 5%-10%, the proportioning of boiler flue dust and white lime the best is, weight ratio 5:2, the white lime of 1-2 part of the boiler flue dust of certain 3-5 part is proportioning arbitrarily.

Second step: the solution that makes and active sludge are put into the coagulation bucket with weight ratio 1:3 stir coagulating, churning time is 4 minutes, controlling coagulation bucket rotating speed and be 50 turns/min, adding concentration when stirring is 1 ‰-3 ‰ PAM lysate, and the concentration of making the PAM lysate is 0.5 ‰-1 ‰ suspension liquid, and churning time is at least 3 minutes certainly, maximum 5 minutes, the requirement of rotating speed, minimum is 30 to turn/min, is up to 60 and turns/min.

utilize boiler flue dust to mix with white lime in the present invention, because contain a large amount of sulfurous gas and aluminium sesquioxide also has carbon in boiler flue dust, in wet environment and alkali substance reaction, can generate aquation calcium carbonate, the gum materials such as drated calcium aluminate, stop up the capillary structure in active sludge, easier moulding, white lime is as a kind of auxiliary agent, can not only regulate pH value, also has simultaneously germicidal action, also can become speed as the granular core weighting agent and not allow composition, make the easier moulding of sludge settling, and utilize the PAM lysate to dewater, after processing, not only with this material utilization of waste material of boiler flue dust, reduced simultaneously the water content of mud, the water content of mud is reduced to 70-75%, greatly reduced the amount of mud.

Obviously, above-described embodiment be only for explanation clearly do for example, and be not restriction to embodiment.To those of ordinary skill in the art, can also make other changes in different forms on the basis of the above description.Here need not also can't give all embodiments exhaustive.And the apparent variation of being extended out thus or change still are in protection scope of the present invention.

Claims

1. sludge modification method, its method is as follows: the first step: add entry after the white lime that boiler flue dust and the weight item that with weight item is 3-5 part is 1-2 part mixes, make the solution that concentration is 5%-10%;

2. according to sludge modification method claimed in claim 1, it is characterized in that: in second step, the mixed weight ratio of solution and active sludge is 1:3, and churning time is 4 minutes, and coagulation bucket rotating speed is 50 to turn/min.

3. according to sludge modification method claimed in claim 2, it is characterized in that: in second step, the concentration of PAM lysate in unitary fluid is 0.5 ‰-1 ‰.

4. according to claim 1 or 2 or 3 described sludge modification methods, it is characterized in that: in the first step, mixed weight part ratio of boiler flue dust and white lime is 5:2.