CN100575282C - Refuse leachate treatment technology - Google Patents

Abstract

The garbage filter liquid processing method.The invention belongs to sewage water treatment method, particularly to the treatment process of city garbage percolate.Treatment process of the present invention is handled by: (1) stripping, (2) internal circulating anaerobic mud fluidized bed processing, (3) active biological film and (4) catalytic oxidation four step associating formations successively.Adopt the less investment of art breading percolate of the present invention, processing cost is low, the efficient height, and water quality can reach emission standard.

Description

Refuse leachate treatment technology

Technical field

The invention belongs to sewage disposal technology, particularly to the treatment technology of city garbage percolate.

Background technology

Percolate is the sewage that oozes out from refuse landfill, because it has dissolved the many materials in the component of refuse, thereby make the composition of percolate complicated unusually, principal pollutant comprise large amount of organic such as organic hydrocarbon and derivative thereof, sour lipid, heavy metal, nitrogen salt etc., wherein organic pollutant index COD is at several thousand to several ten thousand milligrams every liter, total nitrogen arrives several thousand milligrams every liter at hundreds of, if without harmless treatment, with soil and the water system around the severe contamination.

Up to now, the domestic ripe relatively method with the treating refuse percolate of studying mainly contains biological treatment and chemical method, and biochemical process comprises anaerobism, aerobic treatment, AB method (being adsorption-flocculation, two sections processing of bio-oxidation), bio-oxidation pond etc.Chemical method mainly contains ozone oxidation method, hydrogen peroxide oxidation process, active carbon adsorption etc.The method that developed countries adopts is more, than widespread be materialization and biochemical process combined since by biochemical process difficulty reach emission request, generally after biochemical treatment, all to adopt membrane filtration process.Some adopts condensed combustion method, osmosis filtration method to handle, and these two kinds of methods are difficult to apply because construction investment and working cost are high at home.The disposal site percolate of at present domestic many large-and-medium size cities all exist treatment effect relatively poor, also need enter problems such as the municipal sewage plant handles again after handling, so efficient is lower, cost is higher.

In Processing Technology Research about percolate, have and adopt materialization to combine with biochemical technology, the relatively low and effluent quality of construction investment and running cost can be stablized the method that reaches discharging standards, (seeing Chinese patent literature 03158354.7).The principal feature of this patented technology is that electrolysis process, anaerobic mud bed reactor and aerobic membrane bioreactor are combined, and makes the wastewater treatment qualified discharge.But because the electrolysis process cardinal principle is to utilize catalytic oxidation effect degradation of organic substances, current density is big more, and it is big more to remove amount of pollutant, but current consumption is also high more.Because electrolysis is removed the running cost and the construction investment of equivalent pollutent and is wanted high with respect to biochemical process, therefore, electrolysis process is placed on the initial section of treatment process, must cause running cost higher.Aerobic section utilizes the membrane filtration principle to carry out last processing again in this patented technology, because membrane technique is domestic newer technology, and since the aperture of film can dam greater than 0.1 micron small-molecule substance, not only the cost of film own is higher, and work-ing life is shorter, and construction investment and running cost still will become the factor of restriction technology popularization.

Summary of the invention

Technical problem to be solved by this invention provides a kind of refuse leachate treatment technology, its less investment, and processing cost is low, the efficient height, water quality can reach emission standard.

Solving the scheme that technical problem of the present invention adopts is: adopt following four procedures to handle successively to percolate, promptly

(1) stripping: regulate percolate pH value to 10～12, and in waste water, send into air, ammonia nitrogen is wherein taken out of;

(2) internal circulating anaerobic mud fluidized bed processing: the percolate that will go up after an operation is handled is sent into the anaerobic sludge fluidized-bed, anaerobic sludge is fully contacted with waste water, the organic contamination substrate concentration that utilizes internal recycle to dilute to enter, raising equipment is to the anti impulsion load ability of waste water;

(3) active biological film is handled: above the aerating apparatus in being filled with the purification tank for liquid waste of active sludge biofilm carrier is set, utilizes active sludge in the pond and the microorganism on the microbial film jointly to wastewater treatment;

(4) catalytic oxidation: utilize the organism in the further degrading waste water of catalytic oxidation effect.

Technical scheme of the present invention also comprises: in stripping was handled, gas-water ratio was according to the ammonia nitrogen concentration and the chemical oxygen demand (COD) (COD of percolate ₅) determine with the ratio of ammonia nitrogen concentration, as, at COD ₅Concentration is 12000mg/l, and ammonia nitrogen concentration is that gas-water ratio is about 1500～2000 under the condition of 1800mg/l;

In internal circulating anaerobic mud fluidized bed processing, waste water upper reaches speed is 0.8m/hr～1.2m/hr behind the water distributor water distribution;

In active biological film is handled, between the biofilm carrier and between biofilm carrier and pool wall the space is arranged, and biofilm carrier accounts for purification tank for liquid waste volumetrical 2/3rds, utilizes bio-carrier to sending into the cutting action of air simultaneously, improves the transfer rate of oxygen in water and the utilization ratio of oxygen.

Technique scheme of the present invention can reach following effect:

(1) solves total nitrogen and the high problem of ammonia nitrogen in the percolate, at first adopt stripping process in the beginning link, remove the ammonia nitrogen that may suppress microorganism growth, making waste water be beneficial to follow-up anaerobic and aerobic handles, be controlled denitrogenation, make processing afterwards easier, the biochemical treatment better effects if, and the ammonia nitrogen of collecting is recycling, can not cause secondary pollution to environment.Alleviate simultaneously catalytic oxidation again and removed the needed power consumption pressure of ammonia nitrogen.

(2) in operational path, upflowing mud fluidized-bed (UASB) the oxygen activity microbial film of becoming reconciled is placed after the denitrification process, before the electrocatalytic oxidation metallization processes, waste water most of pollutent before entering electrocatalysis technology is removed, thereby the current consumption of guaranteeing the electrocatalytic oxidation metallization processes is minimum, reduce processing cost, improved processing efficiency.

(3) the electrocatalytic oxidation metallization processes has except that smelling, decolouring, thoroughly remove the excellent results of ammonia nitrogen and most of pollutent, therefore catalytic oxidation is placed at last, can remove the pollutent that to degrade and remove by biochemical method, thereby guarantee effluent quality as required, it not only can save the high running cost that catalytic oxidation caused at the technology beginning, also can save high construction investment and running maintenance that film is handled simultaneously, although increased the stripping process of nitrogen, but working cost and construction investment will be lower than the above-mentioned patented technology of mentioning, and the effect that reaches all can realize qualified discharge.Utilize the electrocatalytic oxidation metallization processes, the residual contaminants after the biochemical treatment is carried out last processing, can remove the ammonia nitrogen in the waste water 100%.The TN clearance can reach 94%.The present invention is placed on the COD and the ammonia nitrogen qualified discharge that are used for guaranteeing sewage at last of technology to catalytic oxidation,

Embodiment

The example example

Percolate is introduced the equalizing tank that catchments earlier before stripping is handled, add alkali and stir in the pond, sends in the sealing tower again.Press table 1 and regulate the pH value of percolate, utilize gas blower to send into air then and take ammonia nitrogen in the percolate out of, the denitrogenation time is according to COD: TN: TP=100: 5: 1 ratio determines that gas-water ratio is 3000.

Stripping test removal effect table:

Stripping 24hr effect (mg/l) under the different PH conditions of table 1

PH	Former water	9	10	11	12
						TN	1842	823.3	279.6	137.6	271.7
Clearance (%)	0	55.3	84.8	92.5	85.2

As seen pH value is 10～12, and effect is better.

Draw water to upflowing sludge stream bed (UASB) with volume pump after the denitrogenation, the hydraulic detention time of design UASB is 2 days, adopt second-stage treatment, in UASB, the organic contamination substrate concentration that simultaneously utilizes internal recycle to dilute again to enter, waste water upper reaches speed control is 0.8m/hr～1.2m/hr behind the water distributor water distribution.

Table 2 UASB treating refuse percolate effect monitoring data

The anaerobism time	CODcr	TP	TN	PH
					Former water	12671.58	53.627	857.84	7.5
1	12280.18	45.709	709.993	7.5
					2	10976.85	46.946	631.823	7.8
3	9707.85	72.184	636.011	7.8
					4	7488.565	48.184	723.95	8.0
5	7094.43	73.668	729.535	8.1
					6	5479.68	56.686	633.587	8.2
7	4981.527	49.652	745.699	8.2
					8	4363.638	28.174	617.864	8.3
9	3913.198	23.597	620.656	8.4
					10	3296.034	15.908	648.398	8.4
11	2721.95	/	/	8.4

Handle the back water outlet and enter in the intermittent type active bio film device, stopped 1.5 days, should leave the space between the biofilm carrier and between biofilm carrier and pool wall, and biofilm carrier occupies purification tank for liquid waste volumetrical 2/3rds at intermittent type active bio film device.

Table 3 intermittent type active biological film processing data table

Catalytic oxidation is carried out in last draining, and stench and color in the water are eliminated fully, and ammonia nitrogen 100% is removed, and the TN clearance can reach 94%, reaches emission standard.

Table 4 catalytic oxidation art breading effect (I=5A, PH=8.8)

Electrolysis time	CODcr	TN	TP	The CODcr clearance	The TN clearance	The TP clearance	Voltage
								0	2596.413	627.586	14.582				7*5
1	2006.957	303.609	8.172	22.7	51.7	44.0	7*5
								2	1331.539	83.371	5.03	48.7	86.7	65.5	6.5*5
3	892.605	74.341	4.773	65.6	88.2	67.3	6.5*5
								4	476.301	64.951	4.667	81.7	89.7	68.0	6.5*5
5	218.941	61.936	3.495	91.6	90.1	76.1	7*5
								6	84.208	57.341	3.521	96.8	90.9	75.9	8*5
7	42.104	49.643	3.521	98.4	92.1	75.9	8*5

The processing cost of percolate is as follows:

About 15 yuan/ton of working cost.

Wherein: 1) the stripping electricity charge: 2.66 yuan/ton; Medicament expense: 4 yuan/ton

2) the anaerobism electricity charge: 0.28 yuan/ton;

3) the aerobic electricity charge: 1.44 yuan/ton

4) the catalytic oxidation electricity charge: 2 yuan/ton

5) other expense: 4 yuan/ton.

Claims (3)

1, a kind of garbage filter liquid processing method is characterized in that: adopt following four procedures to handle successively to percolate,

(1) stripping: regulate percolate pH value to 10～12, and in waste water, send into air, ammonia nitrogen is wherein taken out of;

(2) internal circulating anaerobic mud fluidized bed processing: the percolate after will going up an operation and handling is sent into the anaerobic sludge fluidized-bed, and anaerobic sludge is fully contacted with waste water, the organic pollutant that utilizes internal recycle to dilute to enter;

(3) active biological film is handled: above the aerating apparatus in being filled with the purification tank for liquid waste of active sludge biofilm carrier is set, utilizes active sludge in the pond and the microorganism on the microbial film jointly to wastewater treatment;

(4) catalytic oxidation: utilize the organism in the further degrading waste water of catalytic oxidation effect.

2, by the described garbage filter liquid processing method of claim 1, it is characterized in that:

In stripping is handled, according to the ammonia nitrogen concentration and the chemical oxygen demand COD of percolate ₅Determine gas-water ratio with the ratio of ammonia nitrogen concentration;

In internal circulating anaerobic mud fluidized bed processing, waste water upper reaches speed is 0.8m/hr～1.2m/hr behind the water distributor water distribution;

In active biological film is handled, between the biofilm carrier and between biofilm carrier and pool wall the space is arranged, and biofilm carrier accounts for purification tank for liquid waste volumetrical 2/3rds.

3, by the described garbage filter liquid processing method of claim 2, it is characterized in that: percolate is catchmenting earlier before stripping is handled and is adding alkali in the equalizing tank and stir, and sends into and seals stripping in the tower.