CN1231269A - Process for treating microorganism in mud and sewage by using wooden flakes - Google Patents

Abstract

The sludge and sewage treatment method utilizing microbial activity is characterized by that filling woody flake medium layer in which the grain size of the woody flake is 0.2-5 mm in a treatment tank with ventilating hole, sludge treatment water inlet and sludge treatment water outlet; feeding the aqueous sludge or sewage containing domestic organic substances into the treament tank from the inlet; feeding air into the treatment medium and interrupting air-feeding repeatedly at ambient temp. to make the aqueous sludge or sewage containing domestic organic substances repeatedly and alternatively be in aerobic treatment and anaerobic treatment state so as to reduce BOD concentration of treated water discharged from sludge treatment water outlet. The SS and BOD, etc. of waste water treated by using said invented method can be reduced in the range defined by waste water treatment standard. The waste water can be directly discharged or infiltrated into underground.

Description

Adopt the process for treating microorganism in mud and sewage of wooden flakes

The present invention relates to a kind of mud and sewage treatment process, the method for particularly utilizing microbial activities that various mud and sewages are carried out a biological disposal upon.

Precipitating sludge after roughly being divided into sediment, desilting, initial settling tank mud, watering filter plate and handling according to the different generations of mud source, the excess sludge after the active sludge treatment, be sick of property digested sludge, aerobic digestion mud etc.The main chemical compositions of the mud of these kinds, amount and physics-chem characteristic are shown in table 1-3.

The chemical ingredients of the various mud of table 1. (dry solids benchmark (%)

The quality and quantity of the various mud of table 2.

The physicochemical characteristic of the various mud of table 3.

The Chemical Composition of the various mud of table 1

(drying solid benchmark (the %)) piece that dewaters

	Raw sludge	Digested sludge	Active sludge	Raw sludge	Digested sludge
						Volatile matter	???60-80	?45-60	???62-75	?55-75	????40-60
Ash oontent	???20-40	?40-55	???25-38	?25-45	????40-60
						The insoluble ash oontent	???17-35	?35-50	???22-30	?15-30	????30-45
Fat, grease	???7-35	?3-17	???5-12	?5-30	????2-15
						Protein	???22-28	?16-21	???32-41	?20-25	???14-30
Nitrogen	???4.50	?2.25	????6.20
						Mierocrystalline cellulose etc.	???10-13	?10-13	????7.8	?8-10	????8-12
Nitric acid ammonia	???1-3.5	?1-4	????4-7	?1-3	??1.3-1.6
						Vanadium Pentoxide in FLAKES	???1-1.5	-0.5-3.7-	????3-4	?1.4	??0.5-3.5
Potassium oxide	???0.5	?0.5	????0.75
						Silicon-dioxide	???13.8	?27.60	????8.50

The quality and quantity composition % (in the dry thing) of the various mud of table 2

The mud kind	Moisture content %	Following water 1000m 3Every m 3	Proportion	Volatile matter	Nitrogen	Vanadium Pentoxide in FLAKES	Ether solubility fat
								The common precipitator method (no stirrer)	??97.5	????4.8	?1.015	?65	??2.0	??1.67	??10.0
(stirrer is arranged)	???95	????2.4	??1.02	?65	??2.0	??1.67	??10.0
								Because of the digested sludge of Hough groove	???90	????0.9	??1.01	?50	??2.5	??1.75	??8.0
Watering filter plate mud	???93	????5.2	??1.03	?60	??1.75	??1.5	??9.0
								Active sludge	?98-99	???18.5	?1.003	?65	??5.75	??2.75	??7.5
The corrupt groove mud of following water?	???93	????1.9	??1.03	?45	??1.5	??1.0	??9.0

The all characteristics of the physical chemistry of the various mud of table 3

Kind	?????PH	Total solid substance %	Organism/inorganics %	Proportion (g/cm 3)
					Purification tank mud	??6.6-7.6	?0.27-1.52-5.23	?58-75.2-80 ?42-24.8-20	1.001-1.028-1.017
Active sludge	??7.1-7.2	?0.26-0.54-1.06	?27-37-54 ?73-63-46	?1.002-1.003-1.00
					Eventually heavy mud	??6.7-7.0	?0.38-1.10-2.63	?38-46-53 ?62-54-47	?1.002-1.007-1.019
The eventually heavy mud in public place	??7.1-7.2	?0.23-0.57-1.00	?69-72-74 ?31-28-26	?1.001-1.002-1.003
					Extract ight soil	??8.1-8.3	?0.21-1.65-8.24	?46-59-79 ?54-41-21	?1.000-1.009-1.027
Ight soil digested sludge	??7.7-8.7	?0.37-3.27-6.98	?59-63.7-70 ?41-36.3-30	?1.01-1.023-1.063
					The eventually heavy mud of ight soil digestion	??6.9-7.9	?0.78-3.01-5.83	?64-74.3-81 ?36-25.7-19	?1.003-1.009-1.017

As seen, various mud all contain large amount of organic and moisture content, if not adding processing just abandons, can produce corruption, stench, do not allow with environmental health, therefore must handle.

At present, above mud is handled, employing directly abandons method usually, or adopts physicochemical treatment methods such as oxidation, burning, certainly, biochemical processing methods such as the anaerobic digestion of the microbial activities of utilizing, good gas digestion is arranged also in recent years.But spontaneous fermentation is generally adopted in existing biochemical treatment, and still there is secondary pollution in it, and with the engineering of these treatment process associated, promptly concentrate, aspect such as dehydration, it is poor for applicability, the big and final processing funds of operation easier height.

And no matter the final treating method of various mud be to handle on the ground, handles (ocean processings) in the water and still utilize and handle, and when carrying out these processing, mud all is to transport with the form of solid or liquid.For floor treatment, as the digested sludge that will contain moisture content or dry under sunlight, or the solid behind the mechanical dehydration pulverized the method that is used for soil improvement, also have dry thing is abandoned method in vacant lot; Handle for utilizing, though digested sludge is low as the fertilizer price, utility value is not high, not welcome by farmers'; And handle in the water is with digested sludge or liquid state, or load onto ship after the dehydration to ocean dumping, or digested sludge spread in seawater by pipe-line transportation, but the treatment process of using ship is often because of the traffic requirements higher cost of mud, and adopt the marine diffusion of pipe-line transportation jettison method to be subjected to suitable shore current again, the depth of water is big, utilize the restriction of the geographical conditions such as hydrologic condition of diffusion, must be in advance remove remove slag, the wet goods suspended solid, can not sludge settling be arranged in the seabed, from the outward appearance to essence, can not to implement to be actually very difficult seawater mudization.

The object of the present invention is to provide a kind of suitability strong, easy and simple to handle, cost is low, handles sludge microbe treatment process completely.

The present inventor aspect this class sludge treatment with regard to its treatment process with jettison method, study repeatedly through the problem that should overcome common technology, be surprised to find, in the fine wooden flakes of deciding granularity, inject various processed mud, by simple processing, mud is decomposed fully, digestion, filter, and see through water behind the wooden flakes and can handle and meet SS, the directly discharging or of the regulation of BOD etc. to underground infiltration (described wooden flakes is meant the fine wood powder that typically is known as wood sawdust and wood chip etc., comprises generally speaking having with the same porousness of wood sawdust and give whole wooden flakes of suitable voidage under bits shape filling state).

Continuous experiment and research according to the present inventor, by wooden flakes is used for the processing of mud as the microbiological culture media treatment media layer of holding concurrently, with the corresponding bacterial classification generation of composition breeding effects such as phat fat in the various mud in the layer, protein, Mierocrystalline celluloses, mud decomposes fully in the short period of time, digests.Remain in office where manage residue in the treatment trough hardly, contain wooden flakes treatment media layer Maintenance free, replenish, can permanently use.

According to above-mentioned thinking, the present invention is achieved in that a kind of process for treating microorganism in mud and sewage that adopts wooden flakes, it is characterized in that: in the treatment trough with ventage, sludge treatment water inlet and sludge treatment water relief outlet, the filling particle diameter is the wooden flakes treatment media layer of 0.2-5mm; Feed water-containing sludge or contain life Organic pollutants water from sludge treatment water inlet, simultaneously at ambient temperature, in treatment media, supply gas repeatedly and interruption is supplied gas through ventage, allow water-containing sludge or contain life Organic pollutants water and alternately be in gas processing and lonely property treated state repeatedly, thereby reduce the BOD concentration from the treating water that sludge treatment water relief outlet is discharged.

Among the present invention, be used for the granularity of the wooden flakes in the processing of sludge microbe engineering, the composition of size-grade distribution and chemical ingredients must maintain in the specified range, this point is very important, granularity particularly, average fragment directly should be 0.2-5mm, is preferably in the 0.2-3mm scope.If fragment directly is lower than 0.2mm, can reduce filtering function, stop up and produce; If the fragment footpath is too small as the specific surface area of microbiological culture media more than 5mm, there is not sufficient sludge treatment ability.

The chemical constitution of wooden flakes more or less changes according to the kind and the solid difference of log, mainly contains the 60%-65% Mierocrystalline cellulose haply, 15%-25% xylogen, 10%-15% piperylene and water.Log kind in hand now nearly all can satisfy above scope and form.

Sludge treatment temperature of the present invention generally gets final product equally with envrionment temperature, there is no need specially attemperation.Such as in the winter time or cold zone, as long as envrionment temperature is more than 3 ℃, because the decomposition of microorganism, the heat that fermentation reaction produced exist among the wooden flakes, thereby can handle fully.So " at ambient temperature " this condition in the method for the present invention means and removes controlled temperature not aggressively, but allow the chemical reaction of the microorganism in the treatment media layer naturally and understandably carry out.

Sludge treatment most important characteristic is the biochemical treatment of the decomposition undertaken by the sludge microbe activity, digestion, fermentation etc. among the present invention, is undertaken by the microbial reproduction that mud or native medium outside atmosphere are invaded in the treatment media layer (being wooden flakes).This microbiological treatment is normally undertaken by the digestion of good gas or lonely property bacterium.In the present invention, have the breeding condition that is suitable for microbial cells in the mud in the wooden flakes,, can obtain more good sludge treatment effect if be concatenated to form gas and lonely sexual reproduction environment one by one according to its bacterial classification.Therefore, when carrying out the microbiological treatment of mud, importantly in wooden flakes, send into air off and on.

The filling ratio of described wooden flakes treatment media layer is that the 10%-100% of treatment trough capacity is the best.

Water-containing sludge that feeds from sludge treatment water inlet or the treatment capacity that contains life Organic pollutants water just determine according to the BOD concentration of sewage sludge.

Employed treatment media layer is a prerequisite to contain above-mentioned wooden flakes among the present invention, and according to its situation, inanimate matter sorbing material such as a part also available zeolite or porous ceramics and even filter material and other have the porous material of said function to replace.The blending ratio of porous material and wooden flakes is preferably in 1 in this case: 4-3: in 8 the scope.

The kind difference of mud, insoluble inorganic content difference such as sand, in this case, long-time this method that adopts is handled water-containing sludge, husky can being piled up in the treatment media layer that is made of wooden flakes produces and stops up, and this may cause its processing capacity to reduce.Therefore, for this situation, in advance processed mud is diluted to suitable concentration usually, sand in the mud is precipitation therefore and immediately, and the isolating clarification of water of going up is therewith injected the treatment media layer that contains above-mentioned wooden flakes, can effectively handle mud as stated above.It is fixed that above-mentioned weaker concn waits according to isolated fully sand from mud and the economy of handling the water yield, if to the following just sufficient practicality of tool of 1000PPm.

In the present invention, because the organism porous structure of wooden flakes, the bigger specific surface area that can be equal to mutually with common available porous ceramics is arranged, the sludge digestion bacterium of the outside being invaded wooden flakes forms fabulous breeding environment, that is to say, wooden flakes is according to physical property and the chemical aspect of its porousness to microorganism, when giving the bigger breeding point of adsorption surface, as organic substratum, sludge components to these bacteriums decomposes, digestion, during biochemical reactions such as fermentation, can cushion holding temperature preferably, humidity, reaction conditions such as gas pushing quantity and pH value, the function of the organic humic of breeding place-soil of the microorganism in interaction energy and the physical environment soil compares favourably.These are excellent results that normally used porous adsorbing material did not have fully such as zeolite.

Among the present invention, forming good microbial reproduction environment on the other hand by used wooden flakes, by in wooden flakes, sending into air discontinuously, alternately form gas and the vegetative condition of lonely property of being suitable for, make the digestion of this bacterial classification that exists in the mud active giving full play to separately, thereby obtain effective sludge digestion effect.These good gas and lonely property digestion condition during each in repeatedly one by one, than usually we know make good use of gas, digestion that the property bacterium that is sick of carries out will carry out rapidly, the decomposition of mud, digestion are more complete.Its mud degrading activity is suitable for various widely sludge components, has common thalline residue hardly after handling, even compositions such as rubber mass, hair also can be decomposed by the processing of some months.

The sludge treatment that adopts the present invention to carry out by decomposing completely, digest, is handled SS, BOD etc. in the waste water afterwards and can be reduced in the scope that the wastewater treatment standard can stipulate, waste water can directly discharge or allow its infiltration underground.

Adopt the present invention,, do not stay residue in the treatment trough, do not pile up, also almost do not have loss and use all the year round as the wooden flakes of treatment media owing to handle gold, so treatment trough need not substantial maintenance being provided with after, can semipermanent use.In addition, the present invention does not need the stirring of treatment trough again fully because of carrying out at normal temperatures, except that above-mentioned air is sent into, without other operations, can significantly save the labour, reduces cost.

In sum, treatment process of the present invention, be the treatment media layer that last clarification of water after the mud dilution that need are dealt with and sanitary sewage and the injection of life organically-polluted water contain wooden flakes, once and again supply gas at ambient temperature or the very easy method supplied gas and handle in the interval.And, suitability of the present invention is strong, can be used for corrupt groove mud under the treating water, purification tank mud, eventually heavy mud, municipal sludge, ight soil mud, ight soil digested sludge, the eventually heavy mud of ight soil digestion, sanitary wastewater mud, food plant wastewater mud, animal excrement mud and above-mentioned all kinds of sewage, its organic polluted water can be decomposed at short notice fully, digestion, and because by the wooden flakes layer, suspended substance and BOB etc. can be reduced to below the prescribed value of existing rule in the handled sewage, can satisfy the wastewater treatment standard fully, can directly discharge or to underground infiltration.

The invention will be further described below in conjunction with embodiment:

Embodiment 1: the 1 kilogram of wooden flakes with 5 kilograms of about 0.5-1mm of particle diameter of filter plate mud of will sprinkling water mixes, adjust to 50%-75% with moisture, then the treatment trough that is filled with above-mentioned treatment media layer was sent into air in continuous 8 hours with 90 liters/hour flow, interrupt afterwards supplying gas in 16 hours, and repeat this operation repeatedly, to carry out the microbiological treatment of mud at normal temperatures, processing through 48 hours, mud is fallen by digestion rapidly, leaves any processing residue in the wooden flakes layer in the treatment trough hardly.The pH value of treatment trough relief liquor is 6.5, and the BOD5 value is 7.

Embodiment 2: the lonely property digested sludge that height is contained insoluble inorganics has just produced latch up phenomenon by the same subsequent treatment of embodiment 1 in the treatment trough in the short period of time as a result.

This example will add water again in advance in the mud, be diluted to the concentration of 1000PPm, at first allow and contain insoluble substance sedimentations such as sand in the mud, then sludge liquid injection after 1 cubic metre the separation is filled with 5 kilograms, particle diameter is in the treatment trough of 0.5-1mm wooden flakes, injects from the flow of treatment trough top with 100 liters/hour, meanwhile, supplied gas in continuous 8 hours from the treatment trough below with 60 liters/hour flows, interrupt then supplying gas in 16 hours, repeatable operation is carried out microbiological treatment at normal temperatures.

Mud all digested rapidly and treatment trough in the wooden flakes layer in almost do not see any processing residue.The pH value of treatment trough relief liquor is 6.0, and the BOD5 value is about 8.

Embodiment 3: add water in 0.7 kilogram of active sludge, be adjusted into the suspension liquid of sludge concentration 700PPm, fully stir then, make insoluble inorganics settlement separate.

The treatment media mixture filling that the porous ceramics uniform mixing that is the wooden flakes that is 0.2-5mm with 8 tons of particle diameters and 3 tons of particle diameters 0.3-10mm forms is injected suspension liquid after settlement separate from the treatment trough top with 120 liters/hour flow in treatment trough.Simultaneously, supplied gas in continuous 8 hours from the treatment trough below with 90 liters/hour flows, supply gas then and interrupted 16 hours, repeatable operation is carried out microbiological treatment at normal temperatures.

Mud is by rapid, and complete digestion is fallen, and does not almost see the processing residue in the treatment media mixture in the treatment trough.The pH value of treatment trough relief liquor is 6.2, and the BOD5 value reduces to 17.

Embodiment 4: add water in the digested sludge of 0.7 kilogram of Yin Huofu groove, be adjusted into the suspension liquid that sludge concentration is 700PPm, fully stir then, make insoluble inorganics settlement separate.

Being 0.2-5mm with 8 tons of particle diameters, 1 ton of colloid soil that particle diameter is 0.3-5mm, the treatment media mixture filling that the zeolite uniform mixing that 1 ton of particle diameter is 0.2-4mm forms is in treatment trough, inject the suspension liquid behind the precipitation separation again from treatment trough top, send into air from the below by embodiment 3 same methods, make microbiological treatment at normal temperatures.

Mud is fallen by rapid complete digestion, does not see the processing residue in the treatment media mixture in the treatment trough, and the pH value of treatment trough relief liquor is 6.2, and BOD5 is reduced as about 12.

In the foregoing description 3,4, as the extender of wooden flakes blended porous ceramics in addition, the chemical constitution such as the following table of colloid soil (deer natural pond soil) and zeolite:

Table 5

Chemical ingredients	Porous ceramics	Colloid soil	Zeolite
				Aluminium dioxide	????68.00	????40.15	??55-70
Aluminum oxide	????21.00	????30.10	??44-22
				Ferrous oxide	????0.56	????2.33	??0.1-0.6
Calcium oxide	????0.70	????0.03	??0.1-0.5
				Titanium dioxide potassium	????1.5	????0.15	??0.1-2.2
Water	????5.2	????27.50	??5.3-9.0

The assay method of various compositions is all carried out according to GB8978-96 in the waste water of the various embodiments described above.

When using the inventive method to handle mud, nearly all mud is when microbiological treatment is carried out, contain the oriented acidic side of pH value in the reaction treatment groove of wooden flakes to the tendency of development, and when handling mud based on the fishery waste of aquatic, pH value shows weakly alkaline sometimes.This can think in this kind mud due to institute's sodium chloride-containing.

Claims (6)

1. process for treating microorganism in mud and sewage that adopts wooden flakes, it is characterized in that: in the treatment trough with ventage, sludge treatment water inlet and sludge treatment water relief outlet, the filling particle diameter is the wooden flakes treatment media layer of 0.2-5mm; Feed water-containing sludge or contain life Organic pollutants water from sludge treatment water inlet, simultaneously at ambient temperature, in the treatment media layer, supply gas repeatedly and interruption is supplied gas through ventage, allow water-containing sludge or contain life Organic pollutants water and alternately be in gas processing and lonely property treated state repeatedly, thereby reduce the biological oxygen demand (BOD) BOD concentration from the treating water that sludge treatment water relief outlet is discharged.

2. the process for treating microorganism in mud and sewage of employing wooden flakes as claimed in claim 1 is characterized in that: described wooden flakes mainly contains the 60%-65% Mierocrystalline cellulose, 15%-25% xylogen, 10%-15% piperylene and water.

3. the process for treating microorganism in mud and sewage of employing wooden flakes as claimed in claim 1 or 2 is characterized in that: described wooden flakes treatment media layer is filled in the ratio of the 10%-100% of described treatment trough capacity.

4. the process for treating microorganism in mud and sewage of employing wooden flakes as claimed in claim 1 is characterized in that: inanimate matter sorbing material such as the also available zeolite of a described wooden flakes part or porous ceramics and even filter material and other have the porous material of said function to replace.

5. the process for treating microorganism in mud and sewage of employing wooden flakes as claimed in claim 4 is characterized in that: the optimum mixture ratio example of described zeolite or porous ceramics or other porous materials and described wooden flakes is 1: 4-3: 8.

6. the process for treating microorganism in mud and sewage of employing wooden flakes as claimed in claim 1, it is characterized in that: water-containing sludge or contain life Organic pollutants water and be diluted to below the 1000PPm, the insoluble inorganics in the sewage of dilution back is removed in sedimentation, and last clear sewage after will separating then or sanitary sewage inject the treatment media layer that contains above-mentioned wooden flakes to be handled.