CN86108307A

CN86108307A - Sewage water treatment method

Info

Publication number: CN86108307A
Application number: CN198686108307A
Authority: CN
Inventors: 布鲁斯·伯顿; 诺埃尔·康诺顿
Original assignee: Continental Manufacturing and Sales Inc
Current assignee: Continental Manufacturing and Sales Inc
Priority date: 1985-11-08
Filing date: 1986-11-08
Publication date: 1987-07-01
Also published as: FI864533A0; NO864453D0; DK535486D0; KR870004910A; IL80548A0

Abstract

A kind of method of disposing of sewage is with (A) acid inorganic flocculant or precipitation agent; (B) water-soluble cationic polymer; (C) water-soluble anionic polymer; (D) nonacid inorganic flocculant is disposed of sewage.Wherein can not be in (B) except that (A) and (C) add after both, (A), (B), (C) He (D) can random order add in the entry.Except that (C) with (B), other arbitrarily or various medicaments can mix and add part mud and return in the sewage or at least and added (A), (B), (C) and (D) in a kind of sewage of partially disposed.

Description

Sewage water treatment method

What the present invention relates to is water treatment method, especially relate to being used for from sewage, for example waste liquid, river, industry or the agricultural effluent production improvement of purifying waste water water treatment method.

Usually, at first pre-treatment in storage pool of waste liquid is removed remaining solid by firsts and seconds filtering basin or allied equipment after the precipitated solid, is discharged to discharge outlet then, and discharge outlet can be river river or the like.

This processing back water still contains more impurity, and this water treatment method is time-consuming, and storage pool need take than big area.

Know in the art, with its some chemical substance, being added to dissolving as lime and SODA ASH LIGHT 99.2 remains to be removed in the solid water, have the dissolved solids of making precipitation and form the effect that precipitates suspended substance or mud, when these chemical substances of sewage and interpolation are added in the established mud recited above, can improve and quicken the cohesion and the purification of sewage, precipitated solid can be deposited on the particle in the mud and increase from sewage, form firm relatively particle, be easy to separate with the water that cleans.

Also know in the art, coloured, muddy organism and similar impurity can be removed from water by acid flocculation agent, as alum, ferric sulfate or analogue, alkaline matter in these compounds and the water or basic cpd reaction, for example: lime or SODA ASH LIGHT 99.2 form a large amount of insoluble throw outs (hydrate), throw out has very big surface-area, absorb dissolved or colloid and disperse impurity, suspended impurity is surrounded by gluey hydrate, becomes a sedimentary part.

For softening water rather than purify waste water, it is that lime carbonate and magnesium salts are magnesium hydroxide that lime (calcium hydroxide) is added in the entry with the precipitation calcium bicarbonate; Calcium chloride and calcium sulfate unborn and lime and magnesium chloride and sal epsom reaction generation react in adding SODA ASH LIGHT 99.2 (yellow soda ash) and the water.Yellow soda ash and these salts reactions generate lime carbonate, and like this, the hardness in the former water (calcium salt and magnesium salts) is as slightly soluble compound, lime carbonate, and magnesium hydroxide and throw out are partly removed.

Usually when handling, add flocculation agent, for example: alum, sodium aluminate or ferric sulfate, the dregs and the throw out of helping to form separate with water.Yet in order purifying waste water,, also to use the chlorine treating water, suitably to adjust chemical treatment technology, also can reduce the content of silicon as sterilizing and reduce organism.

The chemical precipitation process can purify family or sanitary sewage and trade effluent, with suitable chemical substance (Tai-Ace S 150 for example, lime, iron(ic) chloride, polymer electrolyte or its composition) add in the sewage, sewage is by the one or more agitator of slow rotation or flocculation basins of paddle of having, and colloidal solid generates and has a certain size and the sedimentary particle of weight energy in flocculation basin.Colloidal solid or throw out are precipitated in the suspended substance settling tank, with liquid separation, purifying back water is collected in the weir on the water surface, strike off plate and/or pump is removed the slag that is made of throw out and mud with mud, some trade effluent, family or sanitary sewage have self inherent tendency of flocculation, owing to need only agitated liquid and make the jelly deposition of generation just can obtain corresponding decontamination effect improving, therefore need in such waste liquid, not add the flocculation chemical substance.

Our european patent application NO843036344 discloses a kind of method of having improved of purifying waste water, this method is included in waste liquid or other sewage and adds a certain amount of flocculation agent by following order, for example alum, cation high molecular ionogen and cats product, the chemical substance that adds is mixed with waste liquid or other sewage, making some composition deposition then is mud, water after the processing is discharged, and part mud circulates again, mixes with pending waste liquid or other sewage.

Though proved that this method is very effective, can be in the given time and the factory of given a certain size in greatly increase handled sewage quantity, moisture percentage in sewage sludge is higher than desirable, and is therefore must the sludge discharged amount quite big.If mud contains less water, and more concentrated, its processing will be simpler more economical.

The object of the invention provides a kind of method, and this method is in the benefit of the described method of theme that keeps above-mentioned european patent application, and the mud of its generation is more concentrated, and promptly moisture percentage in sewage sludge is lower.

According to the present invention, provide a kind of method of being purified water, mud of disposing of sewage as follows, this method is that sewage is used

(A) acid inorganic flocculant or precipitation agent;

(B) water-soluble cationic polymer;

(C) water-soluble anionic polymer and

(D) nonacid inorganic flocculant or precipitation agent;

Handle and obtain to purify waste water and mud, wherein (A), (B), (C) and (D) can random order be added in the water, remove (C) and (B) outer two or more above-mentioned substances arbitrarily can mix adding, but must (A) not add after both addings in (B) with (C), wherein part mud returns in the sewage that sewage or returning part handled, added at least in this sewage (A), (B), (C) and (D) at least a.Like this, different chemical agent (A), (B), (C) can add in the following order:

Step 1 step 2 step 3

(A) and (B) (C)-

(A) and (C) (B)-

（B）（A）（C）

（A）（B）（C）

（A）（C）（B）

（C）（A）（B）

The 4th kind of medicament can be during step 1,2 or 3 adds, before or after any the time add.

The order that actual selection goes out should be selected according to the design variable of processed sewage characteristic and employed factory by the people that professional experiences is arranged in this area.

Last tabular has gone out the step of separating, and this only shows that relevant chemical substance can not be pre-mixed before putting into processed sewage.Like this, simultaneously or almost simultaneously two kinds of different chemical substances are added to by different supply lines and have constituted two cover steps in the sewage.

Most preferred embodiment is:

Step (1): (A), step (2): (D), step (3): (B), step (4): (C), or step (1): (A), step (2): (D), step (3): (C), step (4): (B),

" acidity " and " nonacid " flocculation agent/precipitation agent means that medicament has and does not correspondingly have the tendency of the water PH value minimizing of the adding of making.

Sewage preferably through screening and desanding, removes big object and sand grains, and pH value is adjusted in available if desired then suitably alkalescence or acid medicine processing arbitrarily.

Acid flocculation agent/precipitation agent is III family metal-salt preferably, as aluminium salt and/or be group VIII metal salt, as molysite, and can add (adopting " alum " speech here) as alum.

But nonacid flocculation agent/precipitation agent neutral (that is: does not trend towards changing the pH value of the water body that is added, for example Portland cement or the earth as wilkinite), or alkalescence (promptly trend towards increasing add the pH value of water body, the compound of this class material such as Mendeleev chart I group and/or II group element, compound as sodium or calcium), preferential especially is the carbonate or the hydrocarbonate of sodium or calcium, or the oxyhydroxide of sodium or calcium, for example calcium hydroxide (lime) adds carbonic acid gas and suitable oxyhydroxide and can form carbonate or hydrocarbonate on the spot.

The fs that is preferably in mixing/flocculation zone adds alum, lime and lime carbonate or calcium bicarbonate.

The amount of used this chemical agent is preferably:

Alum: about 10-300PPm, more preferably 10-200PPm.

Lime: about 10-100PPm,

Lime carbonate, calcium bicarbonate or carbonic acid: about 1-100PPm, 5～80PPm more preferably,

Fs at mixing/flocculation zone forms the nucleus mixture, and the water body residence time is preferably 1 to 15 minute, and more preferably 1 to 6 minute,

The negatively charged ion medicament that is adopted and the dosage of positively charged ion medicament, preferably as follows:

The negatively charged ion medicament: about 0.01-5PPm, 0.1-5PPm more preferably,

Cation high molecular ionogen medicament: about 0.01-5PPm, 0.1～5PPm more preferably,

The sludge quantity of recirculation changes according to the undressed wastewater characteristics that flows into, mixture (the sewage that has promptly added all chemical treatment medicaments (A), (B), (C), (D) preferably flocculates, but without precipitation/filtration) fs of blowback flocculation zone, the quantity of reflux of blowback also is to change according to the raw waste water characteristic that flows into.

Here adopt " alum " speech to be meant; Aluminium or 3 valency iron and monovalence metal are as K, Na, NH ₄, the hydration sulfuric acid double salt of generation, for example:

K ₂SO ₄·AI ₂（SO ₄） ₃·24H ₂O;（NH ₄） ₃·24H ₂O;KAI（SO ₄） ₂·12H ₂O;（NH ₄） ₂SO ₄·Fe ₂（SO ₄） ₃·24H ₂O。

Can use multiple cationic polymers, long chain cation polymer electrolyte preferably, applied best thing is the multipolymer of acrylamido, trade mark HERCOFLOC855, HERCOFLOC849 or HERCOFLOC848 or PERCOL763 are this compounds.Other are used for improving the polymer electrolyte that purifies grade and comprise or natural (for example protein or glycan compound) or synthetic (for example the alkyl chimney of polyvinyl pyridine is for affixture) high molecular polymer electrolyte.

Can use multiple anionic polymer, these are tensio-active agent preferably, polypropylene amido particularly, and as trade mark DOW A23, A23P, DOW A25, DOW A 27 and PERCOL 1011,

Describe an example implementing the application referring now to accompanying drawing, accompanying drawing is a schematic flow sheet.

At first by screen cloth district 11, remove big object and sand grains from the sewage (for example waste liquid or industry or other waste water) of entry pipeline 10, lead to Trunk Line 12 then.If desired, the pH value of sewage can be adjusted in advance, and alkali or acid are fed Trunk Line 12 from supplying tank B by pipeline 14, and Trunk Line 12 leads to mixing/cohesion or flocculation zone 15,

Mixing/cohesion or flocculation zone 15 can be divided into a nucleation district, be called 17, the three districts 18,16, the second districts, first district, the 4th district 19, acid and nonacid flocculation agent/precipitation agent, for example alum, lime and lime carbonate join the nucleation district, can pass through pipeline 23,23A, 24 and 24A be added to 16,17,18 and 19 districts, also can be directly add Trunk Line 12 by pipeline 22 and 22A.

The nucleation mixture that generates is (promptly in this mixture, solid no longer is in stable suspended state, if and this district in sufficiently long words of treatment time, even can precipitate) enter flocculation zone, anion surfactant and cation high molecular ionogen be respectively by pipeline 25,25A,, 26,26A and 26B add flocculation zone, predetermined part flocculation mixture is circulated again by the pump of being located among the pipeline 27A, turn back to flocculation zone 20,21 and/or 19.

The flocculation mixture by pipeline 27 lead to settling region 28 or precipitation/filtration district 28, the flocculation mixture stops time enough in this district, make sludgd deposition arrive the bottom, enter mud pipeline 30, and lead to mud discharging pipeline 31, and feed mud circular route 32 with predetermined amount, handle back water by 29 dischargings of water outlet pipeline, again round-robin mud is by arbitrary or whole pipeline 32A, 32B, 32C, 32D or 32E send back in the system.

Claims

1, a kind ofly dispose of sewage, obtain to purify waste water and the method for mud, this method is with (A) acid inorganic flocculant or precipitation agent; (B) water-soluble cationic polymer; (C) water-soluble anionic polymer; (D) nonacid first machine flocculation agent or precipitation agent, dispose of sewage, obtain to purify and mud, wherein can not be in (B) except that (A) and (C) add after both, (A), (B), (C) and (D) be added in the water with random order, except that (C) with (B), two or more of these materials can add as mixture, part mud sends back in the sewage or and has added (A), (B), (C) and (D) at least a through partially disposed sewage in.

2, the method for claim 1, wherein acid inorganic flocculant or precipitation agent (A) are the salt of III family and/or group VIII metal in the mendeleev periodic table of elements,

3, method as claimed in claim 2, wherein metal is aluminium or iron.

4, as the described method of the arbitrary claim in front, wherein nonacid inorganic flocculant/precipitation agent (D) is alkaline,

5, method as claimed in claim 4, wherein nonacid flocculation agent/precipitation agent are the compounds of I family and/or II family metal in the mendeleev periodic table of elements,

6, method as claimed in claim 5, wherein nonacid flocculation agent/precipitation agent (D) are oxyhydroxide, carbonate or the hydrocarbonate of calcium, magnesium or sodium,

7, method as claimed in claim 4, wherein nonacid inorganic flocculant/precipitation agent (D) is a neutral,

8, method as claimed in claim 7, wherein nonacid inorganic flocculant/precipitation agent (D) is a wilkinite, Portland cement or clay,

9, the described method of arbitrary as described above claim comprises sieving sewage in advance, removes bigger material and sand grains,

10, the described method of arbitrary as described above claim comprises in advance and regulates pH value with acid or alkaline purification sewage,

11, method as claimed in claim 3, wherein acid flocculation agent/precipitation agent (A) is an alum,

12, the method for claim 1, wherein alum, lime and lime carbonate or heavy sour calcium add in the sewage as the first step.

13, method as claimed in claim 14, wherein said chemical agent adds with following value:

Alum: about 10-300PPm

Lime: about 10-100PPm

Lime carbonate or calcium bicarbonate: about 1-100PPm

14, the method for claim 1, wherein generation have nuclear mixture first step in the water body residence time be 1 to 15 minute, preferably 1 to 6 minute.

15, the method for claim 1, wherein said negatively charged ion medicament (C) and described positively charged ion medicament (B) are to add in second step.

16, method as claimed in claim 15, wherein used described negatively charged ion medicament (C) and described positively charged ion medicament (B) are as follows:

Negatively charged ion medicament: about 0.01-5PPm

Cation high molecular ionogen: about 0.01-5PPm

17, the method for claim 1, with medicament (A) wherein (B), (C) and (D) is disposed of sewage and the part of the flocculation sewage that generates circulates again, sends described second step back to.