CN1310139A - Combined biological rotary cage complete equipment - Google Patents
Combined biological rotary cage complete equipment Download PDFInfo
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- CN1310139A CN1310139A CN 00113291 CN00113291A CN1310139A CN 1310139 A CN1310139 A CN 1310139A CN 00113291 CN00113291 CN 00113291 CN 00113291 A CN00113291 A CN 00113291A CN 1310139 A CN1310139 A CN 1310139A
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Abstract
The combined biological rotary cage system has one initial settling tank set between the water inlet pipe system and the biological rotary cage assembly and one secondary settling tank communicated with the water inlet system between the biological rotary cage assembly and the clear water draining pipe. The two settling tanks are filled with biological stuffing. The system of the present invention has great sewage treating capacity and no sludge exhausted basically and this can reduce post-treatment process.
Description
The invention relates to an organic wastewater biochemical treatment device, in particular to a complete set of equipment with a rotating cage filled with fillers.
The related unit of the applicant has proposed a patent application (patent application No. 99104657.9) relating to "multifunctional high-efficiency biological rotating cage". It is composed of a water inlet pipe 116, a biological rotating cage assembly (120), a biological rotating cage reaction tank (110), an electric control system (133), a driving control mechanism (130) and the like.
Referring to fig. 1, 2, 3 and 4, the multifunctional high-efficiency biological rotating cage is characterized by a biological rotating cage assembly (120). The biological rotating cage assembly (120) is composed of a rotating shaft (121), grid disc-shaped rotating cages (122) with (n +1), a sleeve (128), a large sealing box (123), a small sealing box (124), a shaft end sealing box (125), a bearing box (126) and the like. The grid disc-shaped rotating cage (122) consists of a rotating cage framework (1221), two side plates (1222), 1 inner circle grid ring (1223) and K arc-shaped or trapezoidal six-side grid boxes (1224). K is a natural number greater than 3. The space enclosed by the internal cylindrical lattice ring (1223), the two side plates (1222), and the cannula (128) is a circular communication body in which a large number of various spherical or ovoid biological fillers (1225) are placed. K arc-shaped or trapezoidal six-sided mesh boxes (1224) also have a mass of spherical or ovoid bio-packing (1225) disposed therein. The spherical or oval biological filler (1225) is easy for microbial biofilm growth, has extremely large specific surface area, has excellent comprehensive properties of mass transfer channels and the like.
The process of the multifunctional high-efficiency biological rotating cage comprises the following steps:
after coarse slag and coarse suspended matters are removed from the organic wastewater by the pre-settling regulating tank, the organic wastewater flows into a first reaction chamber (112) of the reaction tank (110) from a water inlet pipe (116). In the first reaction chamber, water flows from the periphery of the grid disk rotating cage (122) to the axis, firstly flows through a six-surface grid box (1224), then passes through an inner grid ring (1223), flows into a channel (1211) formed by the sleeve (128), the rotating shaft (121) and the annular sealing plate (1281) from a strip-shaped opening (1282) in the sleeve (128), flows out from the strip-shaped opening (1283) in the sleeve (121), and enters the second reaction chamber (112).
In the second reaction chamber (112), water flows radially and centrifugally, firstly flows through the inner circle grid ring (1223), then flows through the six-side grid box (1224), then flows into the porous water collecting and distributing pipe (1121) at the bottom of the reaction chamber (112), and flows into the third reaction chamber (112) from the porous water collecting and distributing pipe (1121).
The flow conditions in the third and subsequent odd-numbered reaction chambers (112) are the same as the flow conditions in the first reaction chamber (112); the flow conditions in the fourth and subsequent even-numbered reaction chambers (112) are the same as the flow conditions in the second reaction chamber (112).
In the last 1 (n +1) reaction chamber (112), water flows centrifugally out of the grid disc-shaped rotating cage (122), then flows into the overflow groove (1101), and flows out of the multifunctional high-efficiency biological rotating cage from the clear water discharge pipe (117).
With the continuous rotation of the rotating cage assembly (120), the spherical or oval ball or oval biological filler (1225) in the inner circle grid ring continuously rolls in the annular closed space, and the spherical or oval ball or oval biological filler continuously slightly collides and rubs with the annular closed space to continuously change the positions of the spherical or oval biological filler and the oval biological filler; continuously taking in and sending out sewage, and carrying out mass transfer movement with the sewage which passes through the shoulders and the intestines.
The sewage is subjected to mass transfer motion. This oxygen enrichment in the six-sided mesh box (1224) provides an excellent microbial environment for the aerobic flora.
The multifunctional high-efficiency biological rotating cage is divided into two process areas: one is an aerobic zone, i.e., O zone (O: abbreviation for English OXiC), and the other 1 is a facultative anaerobic zone, i.e., A zone (A: Anacrobic, or abbreviation for Anaxic). The hollow of the six-side grid box (1224) is an O area, and the hollow of the inner circle grid ring (1223) is an A area. The volume ratio of the area A to the area O is generally 1: 2.5-3.5.
When the spherical or oval biological filler (1225) is immersed in the sewage, whether in zone A or zone O, organic matter in the sewage is adsorbed by the biofilm on the filler; metabolite (H) of microorganism2O, organic small molecules such as various organic acids and alcohols, ammonia nitrogen and NO3 -Such as small inorganic molecules) are also excreted in water. When the spherical or ovoid biofilm (1225) is exposed to air, the adherent water layer on the biofilm adsorbs and dissolves oxygen from the air; metabolizing CO produced by microorganisms2≈ N2And the gas such as ↓ is discharged into the air, and on the other hand, the dissolved oxygen attached to the water layer is higher, and when the dissolved oxygen is transferred to the water again, the dissolved oxygen is transferred to the water.
During the process that the rotating cage assembly (120) rotates continuously, regardless of the position of the biological filler (1225), the biological film on the biological filler continuously carries out biochemical degradation reaction on the adsorbed organic matters. However, in different process areas, the biochemical pattern and function are different.
In the O area, a large number of aerobic flora including charring flora, ammonifying flora, nitrifying flora and the like grow and propagate on the biological membrane in the biological filler (1225). The biochemical reaction processes of the organic matters in multiple aspects are carried out simultaneously, and the following 3 types are mainly adopted:
1. the carbonization reaction process of organic hydrocarbon. The aerobic charring flora utilizes aerobic respiration micromolecular organic matter (such as alcohols, organic acids, simple sugar and the like) to be oxidized and decomposed into water and carbon dioxide, and the generated decomposition energy is used for the self life activityThe application is as follows. The reaction formula is as follows: (taking the example that glucose is completely oxidized)
2. Ammoniation reaction process of organic nitrogen compound. The aerobic ammoniation flora utilizes aerobic respiration to oxidize and decompose the nitrogenous organic macromolecules into organic micromolecules and release ammonia Nitrogen (NH)4 +). The reaction formula is as follows: (deamination of amino acids as an example)
3. The nitrification reaction process of ammonia nitrogen, namely the aerobic autotrophic nitrifying bacteria utilize aerobic respiration to release ammonia Nitrogen (NH) released by the reaction of the formula (2) in raw water4 +) By oxidation to nitric acid Nitrogen (NO)3 -) The reaction formula is as follows:
in the area A, a large number of facultative anaerobic flora including acidification hydrolysis facultative anaerobic flora and facultative anaerobic denitrifying flora are grown and propagated on the biological membrane in the biological filler. Organic substances and nitricacid Nitrogen (NO) adsorbed thereto by the organic substances3 -) The biochemical reaction process is carried out in two aspects at the same time:
1. the macromolecular organic matters are degraded into acid, alcohol and other organic micromolecules by the acidification hydrolytic flora and discharged into water to supply a carbon source for denitrification in the area A and a carbonized substrate for the next area O. The reaction formula is as follows: (examples of production of propionic acid and acetic acid by glucose under anaerobic action of propionic acid bacteria)
2. NO excreted from the O-zone by the denitrifying bacteria3 +Reduction to N2And (3) oxidizing and degrading the organic carbon compounds simultaneously by using the formula:
the reaction in the A region in the formula (5) leads to an increase in pH, and the reaction in the O region in the formula (3) leads to a decrease in pH, which leads to feedback inhibition of the growth and reaction rate of microorganisms in the region. The multifunctional high-efficiency organism is used for making each process face to the complementary change of pH value and stabilizing the pH value in the optimum range of microorganismThe rotating cage is designed to be operated by a plurality of A areas and O areas in series alternatively, namely a multi-section (N section) OAO process is operated in series. N is a natural number, and N is a natural number, n is an odd number of natural numbers;
n=1,3,5,7,9,11……
N=1,2,3,4,5,6……
n is the number of semi-circular flat plate partitions (111) in the contact reaction tank (110). The number of n is determined by BOD in the sewage5And NH4 +The higher the concentration, the larger n.
The biological rotating cage assembly is particularly suitable for large-flow sewage, so that the grid disc-shaped rotating cage can be made larger, the grid disc-shaped rotating cage can be made smaller for small-flow sewage, and an inner circle grid ring (1223) is not required to be arranged in the grid disc-shaped rotating cage assembly. Aerobic and anaerobic biological fillers are filled in the grid disc-shaped rotating cage at intervals, and the A/O process is operated in series, so that the working principle is the same. The A cage corresponds to the A area, and the O cage corresponds to the O area.
In the above-mentioned N × (OAO) or pre-aeration N (A/O) process flow, in addition to the above-mentioned five main biochemical reactions, a biochemical process of digesting excess sludge is carried out at the same time. Namely, the normally fallen biological film in one zone flows into the next zone and the latter zones and is decomposed by repeated aerobic and anaerobic digestion. Therefore, the device produces very little sludge. And is easy to be subjected to solid-liquid separation and filter pressing dehydration by the subsequent process.
In addition, organic phosphorus in the sewage is adsorbed by the biological membrane and is used as inorganic nutrition of microbial bacteria, and is released in the form of orthophosphate in the A zone and is absorbed in an excessive amount by aerobic bacteria in the O zone in the process of repeated digestion along with the falling of the biological membrane, and finally is fixed on the biological membrane in the O zone at the last section and is discharged out of the equipment in the form of sludge. Therefore, the device has stronger phosphorus removal capability.
But the disadvantages are: the fungus mass after being subjected to biological rotating cage demoulding still has about 75 percent of activity and is not utilized. Although the sludge is very little, the sludge still has pollution and needs to be further removed by the next-stage process.
The invention aims to provide a combined biological rotating cage complete device which can further reduce the sludge amount and does not need subsequent processes to remove the sludge.
The invention makes full use of the excellent bacteria renewal performance and the residual sludge activity of the multifunctional high-efficiency biological rotating cage, and adds an activated sludge method in the original equipment. The technical scheme of the invention is as follows: a primary sedimentation tank (202) is additionally arranged between the water inlet pipe system (201) and the biological rotating cage assembly (204), and a secondary sedimentation tank (207) is additionally arranged between the biological rotating cage assembly (204) and the clear water draining pipe (2079); the secondary sedimentation tank (207) is communicated with the water inlet pipe system (201) through a sludge return pipe (206); biological fillers are filled in the primary sedimentation tank (202) and the secondary sedimentation tank (207).
At each moment when the water flow continuously flows, in the primary sedimentation tank (202), the denitrifying bacteria flora oxidatively degrades organic carbon compounds in the incoming organic wastewater, and the reaction formula is as follows:
the activated sludge obtained by biological rotating cage stripping is fully utilized, so that the activated sludge has good acidification and hydrolysis capabilities, and the organic matters are immediately removed by more than 30% in the process at this stage. Then enters a biological rotating cage reaction tank (203) for further treatment.
In the secondary sedimentation tank (207), the activated sludge is settled and is conveyed to the water inlet pipe system through the sludge return pipe (206) and enters the primary sedimentation tank together with the organic wastewater.
The invention introduces the activated sludge method into the mechanical rotating biochemical complete equipment, achieves the aim of basically not discharging sludge, and further improves the sewage treatment capacity of the combined biological rotating cage complete equipment.
FIG. 1 is an elevational partial sectional view of a multi-functional, high-efficiency biological rotation cage provided in the prior art;
FIG. 2 is a cross-sectional view of a prior art multifunctional high-efficiency biological rotating cage;
FIG. 3 is a top view of a prior art multifunctional high efficiency biological rotating cage;
FIG. 4 is a schematic front end plate of a prior art multifunctional high efficiency biological rotating cage;
FIG. 5 is a schematic front end panel of the modular bio-tumble kit provided by the present invention;
FIG. 6 is a schematic rear end panel of the modular bio-tumble kit provided by the present invention;
FIG. 7 is a top view of a modular bio-tumble kit provided by the present invention;
FIG. 8 is across-sectional view of a modular bio-tumble kit provided by the present invention;
fig. 9 is a process flow diagram of a modular bio-tumble kit provided by the present invention.
Examples
Referring to fig. 5, 6, 7 and 8, the combined biological rotating cage complete set device provided by the invention comprises a water inlet pipe system 201, a primary sedimentation tank 202, a morning rotating cage reaction tank 203, a biological rotating cage assembly 204, a sludge return pipe 206, a secondary sedimentation tank 207, an electric control system 208 and a driving system 205.
The water inlet pipe system 201 is formed by sequentially connecting a water inlet pipe 2011 with a valve 2012, a mud sucking jet pump 2013, a Y-shaped pipe 2014, a porous water distribution pipe 2015 and the like; and a porous water distributor 2015 is installed in the reaction zone 2025 in the primary settling tank 202.
The primary sedimentation tank 202 is a long box-shaped tank body, and the shell of the primary sedimentation tank consists of front and rear end plates 2021 and 2022, an inner side plate 2023 and an outer side plate 2024; the lower part of the tank body is in a long box bucket form and is used as a sludge digestion zone 2026, the upper part of the tank body is a reaction zone 2025, the upper part of the tank body is an inclined plate sedimentation zone 2027, and the upper part of the tank body is a clear water zone 2028; a porous sludge discharge pipe 2029 is arranged at the bottom of the sludge digestion area 2026, a porous water distribution pipe 2015 is arranged in the reaction area 2025, and a large number of spherical or oval biological balls 2042 are arranged up and down around the porous water distribution pipe 2015. The upper part of the clean water area2028 is provided with a porous water collecting pipe 2121, and the porous water collecting pipe 2121 is communicated with the first reaction chamber 2034 of the biological rotating cage reaction tank 203.
The primary sedimentation tank 202 and the secondary sedimentation tank 207 are arranged side by side, and the biological rotating cage reaction tank 203 is arranged above the space between the primary sedimentation tank 202 and the secondary sedimentation tank 207; the front and rear end plates 2021, 2022 of the primary sedimentation tank 202, the secondary sedimentation tank 207 and the reaction tank 203 are all on the same plane (hence, the same reference numerals 2021 and 2022 are used for indication).
The biological rotating cage reaction tank 203 is provided with (n +1) reaction chambers; biological cage assembly 204 has (n +1) cages. n is 0 and natural odd numbers of 1, 3, 5 and 7 … …, and in the embodiment, n is 5.
The water outlet pipe 2032 of the last reaction chamber 2031 of the biological rotating cage reaction tank 203 is communicated with the porous water distribution pipe 2074 of the secondary sedimentation tank 207.
The secondary sedimentation tank 207 is a long tank body, and the shell thereof is composed of front and rear end plates 2021, 2022, an inner side plate 2171 and an outer side plate 2172; the lower part of the tank body is in a long tank hopper shape and is used as a sludge concentration zone 2071. A porous sludge collecting pipe 2072 is arranged at the bottom of the sludge concentration zone 2071, and the pipe passes through the end wall of the pond and is connected with a sludge suction jet device 2013; a porous water distribution pipe 2074 is arranged in a reaction zone 2073 above a sludge concentration zone 2071, an inclined plate group 2076 is arranged in an inclined plate precipitation zone 2075 above the reaction zone2073, a large number of spherical or oval biological balls 2042 are placed above the inclined plate group 2076, a porous clear water collecting pipe 2078 is arranged in a clear water zone 2077 above the spherical or oval biological balls 2042, and grids 2079 are arranged below the porous clear water collecting pipe 2078 and above the spherical or oval biological balls 2042; the porous clean water collecting pipe 2078 passes through the end wall of the secondary sedimentation tank 207 and is drained through a valve.
The bio-spheres within the cage 2041 of the bio-rotating cage assembly 204 are spherical or ovoid plastic bio-fillers 2042. Biological cage assembly 204, mesh cage 2041, and spherical or ovoid biosphere 2042 are the same as biological cage assembly 120, mesh cage 122, and spherical or ovoid biosphere 1225 of the prior art multi-functional biological cage (patent application No.: 99104657.9).
The sewage treatment process in the combined biological rotating cage complete set provided by the invention is as follows:
the organic wastewater flows into the porous water distributor 2015 of the primary sedimentation tank 202 from the water inlet pipe 2011 to the reaction zone 2025, then rises to the inclined plate sedimentation zone 2027, then rises to the clean water zone 2028, then flows into the first reaction chamber 2034 of the biological rotating cage reaction tank 203 through the porous water collector 2121 at the upper part of the clean water zone 2028, has the same flow state in the whole biological rotating cage reaction tank 203 as the multifunctional biological rotating cage reaction tank 110, then enters the reaction zone 2073 through the water outlet pipe 2032 of the last (n +1) th reaction chamber 2031 to the porous water distributor 2074 of the secondary sedimentation tank 207, then passes through the inclined plate sedimentation zone 2075 to reach the upper clean water zone 2077, finally passes through the end wall of the secondary sedimentation tank 207 through the porous water collector 2078 and is discharged outside through the valve.
Most of the activated sludge carried out from the biological rotating cage reaction tank 203 along with the water flow settles into the sludge concentration zone 2071 and is continuously pumped and carried to the reaction zone 2025 of the primary sedimentation tank 202 by the sludge suction jet device 2013 through the porous sludge collection pipe 2072, so that the carbonization hydrolysis function is enhanced. The rotating cage assembly 204 is driven by the driving system 205 to rotate continuously during the whole process of the water flow continuously flowing through the combined multifunctional high-efficiency biological rotating cage.
The process in the reaction tank 203 is the same as that in the reaction tank 110 of the multi-functional biological cage provided in the prior art,
the process flow chart of the combined biological rotating cage complete device is shown in the attached figure 9
The design examples are as follows:
comprehensive sewage quantity 240m in certain community3/d
Raw water: CODcr≤500mg/L
BOD5≤260mg/L
NH4 +≤40mg/L
Calculation of daily BOD removal5Comprises the following steps:
(0.26-0.02)kg/m3×240m3/d=57.6kg BOD5
in a primary sedimentation tank: removal of 25% BOD5I.e. 14.4kg BOD5. Designed total volume of 10m3NP spherical or ovoid biological Filler Placement 2m3And the rest is designed according to the specifications, the retention time of the wastewater in the pool is 60min, and the retention time of the reaction zone is about 12 min.
In the biological rotating cage section: adopts NP spherical or oval biological filler, the load rate is 8Kg BOD5/d·m3The volume of the rotating cage needs 6.4m35.4m of filler3The average filling factor was 0.85. The reaction tank is 5.2m long, 1.7m wide, the diameter of the rotating cage is 1.66m, 6 rotating cages are provided in total, each rotating cage is 0.78m wide, and the O cage and the A cage are arranged at intervals. The waste water stays for 45min in the process.
In a secondary sedimentation tank: using NP spherical or ovoid biological filler 1m3Placed above the inclined plate sediment, and other materials are designed according to the specification, and the total volume is 7.0m3The residence time was 40 min.
The combined multifunctional efficient combined biological rotating cage complete device has the advantages of 5m of overall length, 2.9m of width, 2.8m of height, 0.75kw (actual power consumption 0.4kwh/h) of matched installed capacity and 8-14 n/min of rotating speed
The diameter of the water inlet and outlet pipe is 100 mm.
The water quality after treatment is as follows:
CODcr≤60mg/L BOD5≤20mg/L NH4 +≤10mg/L
basically has no sludge discharge and does not produce secondary pollution.
Claims (3)
1. A combined biological rotating cage complete device comprises a water inlet pipe system (201), a biological rotating cage reaction tank (203), a biological rotating cage assembly (204), an electric control system (208) and a driving system (205) thereof, and is characterized in that a primary sedimentation tank (202) is arranged between the water inlet pipe system (201) and the biological rotating cage assembly (204), and a secondary sedimentation tank (207) is arranged between the biological rotating cage assembly (204) and a clear water discharge pipe (2079); the secondary sedimentation (207) is communicated with the water inlet pipe system (201) through a sludge return pipe (206); biological fillers are filled in the primary sedimentation tank (202) and the secondary sedimentation tank (207).
2. The combined biological rotating cage complete plant as claimed in claim 1, characterized in that the lower part of the primary sedimentation tank (202) is a sludge digestion zone (2026), the upper part thereof is a reaction zone (2025), the upper part thereof is an inclined plate sedimentation zone (2027), and the upper part thereof is a clear water zone (2028); a porous sludge discharge pipe (2029) is arranged at the bottom of the sludge digestion area (2026), a porous water distribution pipe (2015) is arranged in the reaction area (2025), the porous water distribution pipe (2015) is communicated with a Y-shaped pipe in the water inlet pipe system (201), and a large amount of spherical or egg-shaped biological fillers (2042) are arranged around the porous water distribution pipe (2015) from top to bottom; the upper part of the clean water area (2028) is provided with a porous water collecting pipe (2121), and the porous water collecting pipe (2121) is communicated with a first reaction chamber (2034) of the biological rotating cage reaction tank (203); the lower part of the secondary sedimentation tank (207) is a sludge concentration zone (2071), the bottom of the sludge concentration zone (2071) is provided with a porous sludge collecting pipe (2072), and the secondary sedimentation tank (207) is communicated with the water inlet pipe system (201) through the porous sludge collecting pipe (2072) and a sludge return pipe (206); install porous water distributor (2074) in reaction zone (2073) of sludge concentration district (2071) top, install ramp group (2076) in the swash plate sedimentation district (2075) of reaction zone (2073) top, a large amount of ball-type or ovum type biological packing (2042) have been placed to ramp group (2076) top, porous clear water collecting pipe (2078) is equipped with in clear water district (2077), grid (2079) porous clear water collecting pipe (2078) are installed to porous clear water collecting pipe (2078) below and the top of net biological ball (2042) and are passed the end plate of secondary sedimentation tank (207), through clear water discharging pipe (2079) and the external drainage of valve.
3. The combined bio-rotating cage set according to claim 1, wherein the primary sedimentation tank (202) and the secondary sedimentation tank (207) are installed side by side in the flowing direction of the sewage, and the bio-rotating cage reaction tank (203) is installed above between the primary sedimentation tank (202) and the secondary sedimentation tank (207).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001132911A CN1155527C (en) | 2000-02-25 | 2000-02-25 | Combined biological rotary cage complete equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001132911A CN1155527C (en) | 2000-02-25 | 2000-02-25 | Combined biological rotary cage complete equipment |
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| Publication Number | Publication Date |
|---|---|
| CN1310139A true CN1310139A (en) | 2001-08-29 |
| CN1155527C CN1155527C (en) | 2004-06-30 |
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ID=4583091
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001132911A Expired - Fee Related CN1155527C (en) | 2000-02-25 | 2000-02-25 | Combined biological rotary cage complete equipment |
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| Country | Link |
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| CN (1) | CN1155527C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408163A (en) * | 2010-09-20 | 2012-04-11 | 田磊 | Method for connecting reaction tank with sedimentation tank |
| CN104961225A (en) * | 2015-06-26 | 2015-10-07 | 西安建筑科技大学 | Multifunctional integrated sedimentation treatment device |
| CN109052837A (en) * | 2018-08-29 | 2018-12-21 | 重庆工商大学 | Sewage treatment strategy adjustment method based on dynamic scene |
-
2000
- 2000-02-25 CN CNB001132911A patent/CN1155527C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408163A (en) * | 2010-09-20 | 2012-04-11 | 田磊 | Method for connecting reaction tank with sedimentation tank |
| CN104961225A (en) * | 2015-06-26 | 2015-10-07 | 西安建筑科技大学 | Multifunctional integrated sedimentation treatment device |
| CN109052837A (en) * | 2018-08-29 | 2018-12-21 | 重庆工商大学 | Sewage treatment strategy adjustment method based on dynamic scene |
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| Publication number | Publication date |
|---|---|
| CN1155527C (en) | 2004-06-30 |
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