CN201990575U

CN201990575U - Urban sewage treatment system

Info

Publication number: CN201990575U
Application number: CN2011200231563U
Authority: CN
Inventors: 叶侨松; 黎琼华; 黎红安; 杨锦虹
Original assignee: XIAMEN LVDONGLI ENVIRONMENTAL ENGINEERING Co Ltd
Current assignee: XIAMEN LVDONGLI ENVIRONMENTAL ENGINEERING Co Ltd
Priority date: 2011-01-25
Filing date: 2011-01-25
Publication date: 2011-09-28
Anticipated expiration: 2021-01-25

Abstract

The utility model discloses an urban sewage treatment system which is characterized in that the urban sewage treatment system comprises a grid well, a lifting pump, an adjusting pool, a hydrolysis acidification pool, a DC biological aerated filter, a N biological aerated filter, a DN biological filter and a clean water pond; the DC biological aerated filter, the N biological aerated filter and the DN biological filter all adopt the structure that water enters from the bottom parts; the bottom parts of the DC biological aerated filter, the N biological aerated filter and the DN biological filter are connected with a backwashing fan; and the bottom parts of the DC biological aerated filter and the N biological aerated filter are also connected with an aeration fan. The various water outlet indexes of the clean water pond adopting the urban sewage processing system to process urban sewage are superior to the national level-I emission standard.

Description

A kind of town sewage treatment system

Technical field

The utility model relates to a kind of Sewage treatment systems, particularly relates to a kind of town sewage treatment system.

Background technology

Medium and small town sewage is mainly sanitary sewage and based on the combined sewage of the trade effluent of organic waste water, its water yield is less, generally is no more than 50,000 m3/d, but water quality and water yield fluctuation are bigger.Owing to fund and technology, the many-sided reason of management of water equality, having determined must be economical, efficient, energy-conservation and easy and simple to handle at urban wastewater treatment firm.

At present domestic a lot of in samll cities and towns still adopt drainage by open canal, southern area especially, a large amount of rainwater flow into and the underground water infiltration, the not high reason of urban life level has determined that organic concentration is lower in the sewage in addition.Therefore, must select suitable treatment process in conjunction with the water yield, water quality and temperature, weather, meteorology, geography, the economic dispatch practical situation of local sewage.

Summary of the invention

At the problems referred to above, the purpose of this utility model is to provide a kind of economy, town sewage treatment system efficient, energy-conservation and easy and simple to handle.

For achieving the above object, the technical scheme that the utility model proposes is: a kind of town sewage treatment system, it is characterized in that: comprise the grille well that connects successively by pipeline, lift pump, equalizing tank, hydrolysis acidification pool, DC BAF, N BAF, DN biological filter, and clean water basin, described DC BAF, N BAF, DN biological filter all are the bottom water inlet, and the bottom also links to each other with the backwash blower fan, and described DC BAF, N BAF bottom also link to each other with Aeration fan.

Further, be filled with spherical light ceramic filler in the described DC BAF, particle diameter φ 3～6mm, and the perforated pipe aerating regulation device is contained in DC BAF bottom.

Further, described N BAF particle diameter φ 3～6mm, and N BAF inner bottom part has the perforated pipe aerating regulation device.

What each installed in the town sewage treatment system described in the utility model mainly act as:

1) grille well

Be mainly used in bigger solid floating matter and suspended substance in the interception sewage, in equalizing tank, gather precipitation and stop up water pump and pipeline, guarantee that subsequent treatment process normally moves to prevent it.

2) equalizing tank

Because middle samll cities and towns are inhomogeneous and fluctuation is bigger from the sewage water yield of day part, equalizing tank is used for cushioning the water yield, and even water quality is to avoid the influence of impact load to biochemical treatment.

3) hydrolysis acidification pool

Divide Sludge Bed district and clear pelagic division in the hydrolysis acidification pool, the residue microbial film that comes off when treatment sewage and filter back washing is entered in the pond by reactor bottom, and mixes fast and equably with Sludge Bed by the water distributor of band reflector.Sludge Bed is thicker, is similar to filtering layer, thereby particulate matter in will intaking and colloidalmaterial are held back rapidly and adsorbed.Because Sludge Bed contains the aerobic-anaerobic microbe of high density, in the pond under the anoxia condition, the organic substance that is retained down is under a large amount of hydrolysis-acid-producing bacteria effect, with insoluble hydrolysis of organic matter is dissolved matter, with macromole, be difficult to biodegradable material and be converted into and be easy to biodegradable material; Simultaneously, excess sludge (residue microbial film) the thalline exo polysaccharides cement layer generation hydrolysis of discharging during the biological filter back flushing opens cell walls, the mud liquid stateization, come back in the Sewage treatment systems by the aerobic bacteria metabolism, reach the purpose that excess sludge subtracts appearanceization.Because the sludge age of acidication is grown (general 15～20 days), adopt hydrolysis acidification pool to replace conventional preliminary sedimentation tank, except that reaching the purpose of holding back suspended substance in the sewage, also have the stable function of part biochemical treatment and reducing sludge volume.

4) DC BAF

The DC BAF to be to remove carbonization organism in the sewage, and in this section filter tank, the dominant growth heterotrophic bacterium is in to water side organic concentration gradient along the filter tank short transverse from the bottom feed-water end and successively decreases, its degradation rate trend that also tapers off.Higher owing to organic concentration at entrance end, heterotrophic microorganism is in the logarithmic proliferation phase, and microorganism concn is very high, and the BOD loading rate is also higher, and organic matter degradation rate is very fast, and this moment, autotrophic bacteria was in holddown; Carrying out along with degraded, organic concentration is along the bottom-up continuous reduction of current in the filter tank, and heterotrophic microorganism is in the deceleration propagation phase, and microbial film increasess slowly, and autotrophic microorganism is in the propagation engineering, and the organism in the DC BAF final outflow water has been in lower level.

5) N BAF

The N BAF is mainly carried out nitrated to the ammonia nitrogen in the sewage, in this section filter tank, because organic concentration is lower, heterotrophic microorganism is less, and dominant bacteria is the autotrophic type nitrifier, the ammonia nitrogen in the sewage can be oxidized to nitrogen as nitrate or nitrite.

6) DN biological filter

The DN biological filter is mainly used to carry out anti-nitration reaction, to satisfy the requirement of water outlet to TN.Simultaneously can be according to when the emission standard requirement TP≤0.5mg/l, the water-in in this grade filter tank adds molysite and carries out chemical dephosphorization.Adopt the rear-mounted denitrification filter tank to need additional carbon, as methyl alcohol etc.

In sum, the utility model is used for town sewage and handles and mainly to have the following advantages:

1) adopt the parallel upward flow of air water, make gas, water carry out fabulous dividing equally, prevented bubble condensing in filtering layer, the coefficient of oxygen utilization height, energy consumption is low;

2) less pond holds and floor space, adopts municipal sewage plant's technology structures floor space of biological aerated filter process to have only about 1/3 of common process;

3) treatment effect is stable, and treat effluent water quality is good.The Up-flow Biological Aerated Filter Process for Treating Municipal, its water outlet SS and BOD5 can remain on below the 20mg/L, and the clearance height satisfies the requirement of discharging standards;

4) level of automation height, operational management is simple;

5) be subjected to weather, the water yield, water quality impact little;

6) structures modularization helps enlarging from now on;

7) major equipment and material all can domesticly form a complete production network, and need not utilize import.

Description of drawings

Fig. 1 is a town sewage treatment system basic block diagram described in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described further.

Shown in Fig. 1 the utility model basic system figure, a kind of town sewage treatment system, comprise the grille well 1 that connects successively by pipeline, lift pump 2, equalizing tank 3, hydrolysis acidification pool 4, DC BAF 5, N BAF 6, DN biological filter 7, and clean water basin 8, DC BAF 5, N BAF 6, DN biological filter 7 all are the bottom water inlet, and the bottom also links to each other with backwash blower fan 501,601,701 respectively, and DC BAF 5, N BAF 6 bottoms also link to each other with Aeration fan 502,602 respectively.

Be filled with spherical light ceramic filler in the described DC BAF, particle diameter φ 3～6mm, and the perforated pipe aerating regulation device is contained in DC BAF bottom.

Described N BAF particle diameter φ 3～6mm, and N BAF inner bottom part has the perforated pipe aerating regulation device.

The every index of clean water basin water outlet that adopts above-mentioned town sewage treatment system to carry out the town sewage processing all is better than national grade one discharge standard.Concrete water quality is as shown in table 1 below:

Table 1

Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; in the form and details the utility model is made various variations, be protection domain of the present utility model.

Claims

1. town sewage treatment system, it is characterized in that: comprise the grille well that connects successively by pipeline, lift pump, equalizing tank, hydrolysis acidification pool, DC BAF, N BAF, DN biological filter, and clean water basin, described DC BAF, N BAF, DN biological filter all are the bottom water inlet, and the bottom also links to each other with the backwash blower fan, and described DC BAF, N BAF bottom also link to each other with Aeration fan.

2. a kind of town sewage treatment system according to claim 1 is characterized in that being filled with in the described DC BAF spherical light ceramic filler.

3. a kind of town sewage treatment system according to claim 2 is characterized in that described spherical light ceramic packing material size φ 3～6mm.

4. according to the described a kind of town sewage treatment system of the arbitrary claim of claim 1-3, it is characterized in that described DC BAF inner bottom part contains the perforated pipe aerating regulation device.

5. a kind of town sewage treatment system according to claim 1 is characterized in that the particle diameter of filler in the described DC BAF is φ 3～6mm.

6. a kind of town sewage treatment system according to claim 1 is characterized in that described N BAF inner bottom part has the perforated pipe aerating regulation device.