CN1076323C

CN1076323C - Sewage treating method

Info

Publication number: CN1076323C
Application number: CN96110674A
Authority: CN
Inventors: 藤松晃
Original assignee: TOYO BIOLOGICAL REACTION KK
Current assignee: TOYO BIOLOGICAL REACTION KK
Priority date: 1995-07-20
Filing date: 1996-07-19
Publication date: 2001-12-19
Anticipated expiration: 2016-07-19
Also published as: MY122849A; SG63648A1; CN1159429A; KR0170038B1; JPH0929280A; KR970006199A

Abstract

A method is disclosed for the dissolution and purification of tantalum pentoxide. The impure tantalum pentoxide is reacted with a potassium-containing compound to form potassium tantalate. The potassium tantalate is optionally slurried with sulfuric acid and dissolved in an HF medium. The solution is suitable for purification by conventional ion exchange or solvent extraction methods. A potassium fluorotantalate precipitate may also be formed by adding KCl to the solution. The fluorotantalate precipitate may be further processed into a pure tantalum pentoxide by suspending the precipitate in an aqueous solution optionally containing a chelating agent and adding ammonium hydroxide to form ammonium tantalum oxide which can then be converted to tantalum pentoxide by calcining at high temperature.

Description

Method of wastewater treatment

The present invention relates to a kind of method of wastewater treatment, relate to a kind of method of wastewater treatment that can further improve the aggegation adsorptive power and the throw out formation ability of active sludge in more detail.

Known conventional actived sludge is to carry out the method that biological chemistry is handled with containing organic waste water.

This conventional actived sludge is that dissolved organic matter that decomposes rapidly when utilizing biological chemistry to handle and the suspended organism that needs certain hour to decompose are handled in same aerator tank.Therefore, contain under the more situations such as following water of suspended organism in processing, aerator tank will be designed to be able to carry out long-time as far as possible aeration so that the suspended organism can decompose.

If but were conceived to dissolved organic matter, then would not do not need long-time aeration.

For avoiding the unnecessary waste of this conventional actived sludge, practical application at present be the contact stabilization method, the contact of suspended organism is adsorbed on the throw out of active sludge, throw out solid-liquid separation in settling bath only promptly contains solid part the organic active sludge of suspended and imports in the aerator tank afterwards; Aeration between carrying out is in case of necessity handled.In above-mentioned contact stabilization method, as long as be provided with the contact adsorption tank of low capacity, just can reduce the capacity of aerator tank significantly, this is its advantage place.In this contact stabilization method, dissolved organic matter is attracted on the active sludge, is decomposed by biological chemistry in absorption.

But in the existing contact stabilization method, the organic contact absorption of dissolved organic matter or suspended is insufficient, and therefore expectation improves the aggegation adsorptive power of active sludge and the formation ability of throw out.

The object of the present invention is to provide a kind of method of wastewater treatment that can further improve the aggegation adsorptive power and the throw out formation ability of active sludge.

Method of wastewater treatment of the present invention is characterised in that, the activation stabilization systems is made up of stabilization operation and activation procedure, active sludge circulates between this stabilization operation and activation procedure, the stabilization operation is under aerobic conditions to carry out aeration agitation, activation procedure be with active sludge with contain Humus, stripping property silica, the active silica of stripping or the stripping composition that contains at least a kind of packing material in the vulcanicity pumice of silica contact mixing easily in water.The present invention itself and additional purpose thereof and effect such as following description and the embodiment of the present invention example description.

Fig. 1 implements the block diagram of the device example of method of wastewater treatment of the present invention for expression.

Detailed description and accompanying drawing with reference to following can be well understood to purpose of the present invention and feature thereof.But accompanying drawing only is used for illustrating the present invention, not delimit the scope of the invention.

Followingly enforcement state of the present invention is described with reference to Fig. 1.

Fig. 1 is made up of following operation: contact absorption process 1, solid-liquid separation process 2, stabilization operation 3, activation procedure 4, the activation stabilization system of being made up of stabilization operation 3 and activation procedure 45.

At first, contain organic waste water and be introduced into contact absorption process 1.In contact absorption process 1, waste water mixed in tempering tank 3-8 hour with active sludge.Active sludge in the tempering tank contacts with waste water, and solvability and/or the suspended organism in the waste water contained in absorption.

This active sludge is with previous different, and in activation stabilization system 5, this active sludge is processed into state, and the aggegation adsorptivity of active sludge self has improved, and throw out forms ability and also further improves.Form ability for aggegation adsorptivity and throw out, can in tempering tank, get in a certain amount of active sludge ground beaker visual adding their confirmation.

Improving major cause that this aggegation adsorptivity and throw out form ability and can not negating be to result from the meta-bolites that microorganism self discharges.Even form ability but previous active sludge also has aggegation adsorptivity and throw out, therefore further improving aggegation adsorptivity and throw out, to form ability may be because the amount of meta-bolites has increased, also may because other reasons cause.

The inventor thinks that its reason is as described below.The first, the stripping composition self in activation stabilization system 5 may have agglutinability; The 2nd, this stripping composition may make the microbial growth environment change, and the potential agglutinability of microorganism itself is displayed, and whole agglutinabilities and the throw out formation ability of utilizing the present invention to handle have been strengthened.

The microorganism of growth is aerobic or anaerobion in contact absorption process 1, mainly is bacillus.This bacillus does not just have the above-mentioned organic agglutinability of absorption, and has the character of absorption foul smell composition (Ammonia, Sulfur class etc.).This point can be confirmed by examination by sensory organs.

The organism that contains in the waste water among the present invention is meant solvability and/or suspended organism, and the waste water among the present invention is meant down various waste water such as water, stool and urine waste water, sanitary wastewater.

In contact absorption process 1, air supply in above-mentioned waste water carries out the successive aeration agitation.That is the contact absorption of, being undertaken by active sludge among the present invention is what to carry out under aerobic condition.Activated sludge concentration in the contact absorption process 1 preferably remains in the scope of 3000-8000ppm.

Then, waste water enters solid-liquid separation process 2 from contact absorption process 1.In solid-liquid separation process 2, waste water etc. are separated into absorption and contain organic active sludge and removed treatment of organic matters of organic water in fact.

Treating water carries out subsequent disposal, for example film processing, desalting treatment, electrolysis treatment, activated carbon treatment etc. as required.Solid-liquid separation process 2 uses settling bath usually, but also can utilize film to handle.

Then, contain in the organic active sludge importing activation stabilization system 5 separated in solid-liquid separation process 2 partly or entirely adsorbing.Activation stabilization system 5 is made up of stabilization operation 3 and activation procedure 4.Stabilization operation 3 is under aerobic conditions to carry out aeration agitation.Among the present invention, contain in active sludge, therefore must carry out aeration agitation because solvability and/or suspended organism are adsorbed.Preferably carry out continuously (comprise temporary transient discontinuous) aeration agitation not become the anaerobic limit.Carrying out around-the clock aeration in the present embodiment handles.

In activation procedure 4, the active sludge that will send from stabilization operation 3 contacts mixing with the stripping composition of at least a packing material 6 containing Humus, stripping property silica, stripping property silica precursor.Packing material 6 can be pre-charged with, and also can supply with from the outside.Figure 1 shows that packing material 6 fillings are in the example of the inside of activation procedure 4.Under the situation of outside supply, packing material 6 can use with the form of dissolution fluid.

Humus among the present invention can use natural or artificial Humus.

In addition, the stripping property silica that uses among the present invention can use clay mineral or blast-furnace slag etc. are dissolved in the liquid that contains silica that acid or alkali obtains, silicon sol etc.

In addition, as stripping property silica precursor can use in water stripping easily active silica, contain the vulcanicity pumice of silica etc.

As packing material, can use in Humus, to mix to add at least a inorganics of from silicate, magnesium salts, aluminium salt, calcium salt, selecting, use tackiness agent to carry out the particulate state packing material that granulating is made.Coating of particles can be any one shapes such as cylindrical, corner post shape, disc.Identical with particle, also can use powdery, granulous weighting material.

Active sludge circulates between stabilization operation 3 and activation procedure 4, can circulate continuously, also can intermittently circulate.The active sludge that is activated stabilization in activation stabilization system 5 is sent back in the above-mentioned contact absorption process 1, carries out above-mentioned processing.

The excess sludge that is produced by organic decomposition is taken out from activation stabilization system 5, dewaters.Carry out fermentative processing etc. after the dehydration, can make compound manure and soil improvement material.

Embodiment

Below utilize embodiment to further describe the present invention, but this embodiment does not limit the present invention.

(1) test sample

The following water that uses BOD 250mg/ liter, SS150mg/ liter is as waste water.

(2) test conditions

The condition of each treatment process is as shown in table 1 below.

	Condition
	Condition	Contact absorption process 1	5 hours residence times, continuous aeration
Solid-liquid separation process 2	The gravity settling formula	Contact absorption process 1	5 hours residence times, continuous aeration
Solid-liquid separation process 2	The gravity settling formula	Stabilization operation
3	Continuous aeration stirred 24 hours	Stabilization operation
3	Continuous aeration stirred 24 hours	Activation procedure
4	Use " TOYOROZAI " of Japan BIOREACTOR society system	Activation procedure

Use above-mentioned test sample, under condition shown in the table 1, carry out waste water by treatment process shown in Figure 1 and handle continuously.

As a result, the BOD for the treatment of water is below 5mg/ rises, and SS is below 55mg/ rises.

In addition, the mud of getting in the contact absorption process 1 places the 500ml beaker, confirms that the aggegation adsorptivity of mud and throw out form ability, have good aggegation adsorptivity and throw out as can be known and form ability.

For comparing, be not provided with the treatment process of activation procedure 4, the mud of getting in the contact absorption process 1 same as described above places the 500ml beaker, confirms that the aggegation adsorptivity of mud and throw out form ability.It found that, compares with the present invention, and it is relatively poor that the aggegation adsorptivity of mud and throw out form ability.

Claims

1. method of wastewater treatment is characterized in that being made up of following operation:

To contain organic waste water contacts the organism that makes in the waste water and is adsorbed the contact absorption process that contains with active sludge;

To contact liquid separation that absorption process obtains from this becomes absorption to contain the solid-liquid separation process of the treating water that organic active sludge and organism be removed;

Separate the operation that the organic active sludge importing that obtains activates this active sludge the activation stabilization system of stabilization with partly or entirely adsorbing to contain by this solid-liquid separation process;

The active sludge that will be activated stabilization in this activates stabilization system is sent the operation of above-mentioned contact absorption process back to;

Said activation stabilization system is made up of stabilization operation and activation procedure, active sludge circulates between said stabilization operation and activation procedure, the stabilization operation is under aerobic conditions to carry out aeration agitation, activation procedure be with active sludge with contain Humus, stripping property silica, the active silica of stripping or the stripping composition that contains at least a packing material in the vulcanicity pumice of silica contact mixing easily in water.

2. the method for wastewater treatment of record in the claim 1 is characterized in that active sludge circulates between aforementioned stable chemical industry preface and activation procedure.

3. the method for wastewater treatment of record in the claim 1 is characterized in that Humus wherein is natural or the artificial Humus.

4. the method for wastewater treatment of record in the claim 1 is characterized in that stripping property silica wherein is for to be dissolved in liquid that contains silica or the silicon sol that obtains in acid or the alkali with clay mineral or blast-furnace slag.

5. the method for wastewater treatment of each record among the claim 1-4; it is characterized in that; packing material wherein is to mix to add at least a inorganics of selecting in Humus from silicate, magnesium salts, aluminium salt, calcium salt, uses tackiness agent to carry out the particulate state weighting agent that granulating is made.