CN101941774A - Micro-power dispersion type domestic sewage treatment process - Google Patents

Abstract

The invention discloses a micro-dynamic dispersive type domestic sewage treatment process, the main process includes a regulating tank (optional), anaerobic hydrolysis tank, aerobic biochemical tank, secondary settling tank, sludge well (optional), clear water tank and Landscape green space, in which all the biochemical pools are integrated pools, and the landscape green space is of subsurface flow type. There is only one small power pump in the whole process, aeration and sludge return are realized through the pump and jet aerator, and a better sewage treatment effect is achieved under the condition of micro power, and then the advanced treatment of wastewater is realized through the landscape green space, and beautification environment. The actual operation results show that this process has the advantages of high nitrogen and phosphorus removal efficiency, good treatment effect, low energy consumption, less residual sludge, low investment and operation cost, and small footprint, which is worthy of popularization and application.

Description

A Microdynamic Decentralized Domestic Sewage Treatment Process

technical field

The invention belongs to the technical field of sewage treatment, and specifically refers to a method for performing microdynamic and low-cost treatment of domestic sewage by using a combined process of anaerobic hydrolysis-microdynamic aerobic-landscape green space.

Background technique

With the centralized treatment of large-scale urban domestic sewage, more and more attention has been paid to the pollution of domestic sewage discharged from scattered population settlements (rural areas or communities, etc.) or activities (highway service areas or resort villages, etc.). Sewage treatment processes or devices are not suitable for this kind of decentralized domestic sewage due to economic, management and efficiency issues. It can be seen from the literature review that the buried non-powered or micro-powered sewage treatment processes and equipment mainly used in China have certain advantages in treating them. But there are also some common problems: the non-powered buried process or device occupies a large area, the processing efficiency is poor, the system's ability to resist impact load is low, the effect of nitrogen and phosphorus removal is not obvious, and the use space has become smaller and smaller. There are many micro-dynamic treatment processes or devices, most of which are anaerobic + aerobic processes at present (articles such as Cao Dawei, China Water Supply and Drainage, 2008 (1): 30-34; patents such as Yang Jianzhou, CN1785847A; patents such as He Zhiyong, CN2466145Y), The existing problems mainly include: 1) It has a certain denitrification effect, but it cannot remove phosphorus; 2) It is called micro power, but most of them use fans, the power is still too high, and it has certain noise pollution, so it is not suitable for all-round promotion; 3) No additional ecological function. Although some documents have applied landscape green space for follow-up treatment (as Peng Chuanyi patent, CN101318756A), it is anaerobic + landscape green space technology, and the treatment effect is not as good as anaerobic + aerobic process.

Based on the actual situation, the following principles should be fully considered in the treatment of decentralized domestic sewage: 1) The treatment effect is obvious, and it has a good effect of phosphorus and nitrogen removal; 2) The investment is reasonable and the operation cost is low; 3) The amount of sludge is small, Control the secondary pollution of noise and waste gas; 4) Combine treatment process or device with landscape construction to beautify the environment. In order to solve the problems in the application of micro-dynamic technology or devices, the present invention proposes a combined process of anaerobic hydrolysis-micro-dynamic aerobic-landscape green space to treat distributed domestic sewage, in which anaerobic hydrolysis-micro-dynamic aerobic integration is integrated In the chemical pond, only a small-power water pump is used for backflow aeration. The subsequent landscape green space not only beautifies the environment, but also has effective nitrogen and phosphorus removal effects, which embodies the principle of decentralized domestic sewage treatment. The process has the advantages of simple structure, low energy consumption, less mud production, and stable effluent quality. The engineering practice effect of the invention is very good, and has great economic, social and environmental benefits.

Contents of the invention

1. Purpose of the invention

Aiming at some deficiencies of the current micro-dynamic process or device in the decentralized domestic sewage treatment (poor treatment effect, high power consumption, no ecological function, etc.), the present invention proposes an anaerobic hydrolysis + micro-dynamic aerobic + The craft of landscape green space. The process only uses a low-power pump as the power source for aeration and reflux, and truly realizes the micro-power treatment of dispersed domestic sewage; the biochemical reaction is concentrated in the buried integrated pool, which reduces the floor space; at the same time, it realizes Jet aeration and sludge reflux reduce sludge production and ensure the treatment efficiency of COD and ammonia nitrogen. Subsequently, an ecological landscape green space was built, and the biochemical effluent was purified by subsurface flow to ensure the removal efficiency of nitrogen and phosphorus in the effluent, beautifying the environment. Generally speaking, the present invention realizes effective and low energy consumption treatment of dispersed domestic sewage, and has the advantages of simple structure, less mud production, stable effluent quality, etc., and the operating cost is maintained below 0.3 yuan/ton of water.

2. Technical solution

A micro-dynamic domestic sewage treatment process includes: an integrated biochemical reaction pool and a landscape green space, wherein the integrated biochemical pool can use glass fiber reinforced plastic or steel concrete and other structures, including a regulating pool (optional), anaerobic hydrolysis pool, and aerobic biochemical pool , Secondary sedimentation tank, sludge well (optional) and clear water tank. The regulating tank, anaerobic hydrolysis tank, aerobic biochemical tank, and secondary sedimentation tank include a certain water distribution and water collection system. The aerobic biochemical tank contains a matching type of jet aerator and aeration head, and the secondary sedimentation tank or sludge well A pump is provided, which connects the jet aerator and the regulating tank (or anaerobic hydrolysis tank), and realizes jet aeration and sludge return in the aerobic biochemical tank. The integrated pool discharges mud regularly. The landscape green space accepts the water from the biochemical pool and is a subsurface landscape green space. The interior is laid with a certain thickness of large-grained dolomite or limestone, small-grained dolomite or limestone, soil and local dominant green plants, and the interior is laid with water distribution pipes and drainage pipes. Water pipes, the outer circle of the landscape green space is the water collection channel, and the effluent is collected and discharged.

3. Beneficial effects

Compared with other existing similar devices, the present invention has the following advantages:

In terms of treatment process: 1) The integrated pool realizes jet aeration and sludge return, effectively removes COD and ammonia nitrogen, and reduces sludge production. 2) The subsurface landscape green space was subsequently adopted, and the landscape green space filler bed was filled with a scientifically configured filter layer and soil layer. The primary filter bed was mainly used for filtering, which could prevent the blockage of the landscape green space and make full use of the adsorption, interception and absorption of plant roots , degradation and other purification functions, realize the fine treatment of pollutants in sewage, and effectively reduce TN and TP in sewage; the subsequent filter layer of packed bed and soil layer can also carry a large number of microorganisms for advanced treatment of pollutants in sewage , which ensures that the pollutants in the sewage are well removed, and the effect is very obvious.

In terms of investment and operation: 1) The main structure of the biochemical reaction adopts an integrated pool, which can be optimally selected for construction with glass fiber reinforced plastic or steel concrete structure. The structure is simple and the cost of civil construction is low; 2) Only one low-power pump is used to realize backflow and aeration, Others are self-flowing, with less power consumption and low operating costs. 3) The soil used in the landscape green space is covered by vegetation, and no manual maintenance is required after stable operation.

Description of drawings

Figure 1 Anaerobic hydrolysis-microdynamic aerobic-landscape green process flow chart

Among them, 1: regulating tank; 2: anaerobic hydrolysis tank; 3: aerobic tank; 4: secondary sedimentation tank (including sludge well or clear water tank); 5: landscape green space; A: water inflow; B: integrated biochemical pool; C: landscape green space; D: water outlet.

Figure 2 Typical layout of anaerobic hydrolysis-microdynamic aerobic-landscape green space (1)

Figure 3 Typical layout of anaerobic hydrolysis-microdynamic aerobic-landscape green space (2)

Among them, 1: Inlet water distribution pipe; 2: Combined elastic packing; 3: Jet aerator; 4: Sludge return pipe; 5: Water collection pipe; 6: Central tube water distribution pipe; 7: Submersible sewage pump; Trachea; 9: large particle filler (dolomite or limestone); 10: small particle filler (dolomite or limestone); 11: soil; 12: water diversion pipe; 13: water distribution pipe; 14: catchment channel; 15: green plants .

Detailed ways

Below further illustrate the present invention by specific embodiment:

Implementation example 1

The specific process is shown in Figure 2. The implementation site is a place in northern Jiangsu Province. The anaerobic hydrolysis + micro-dynamic aerobic integrated pool adopts a glass fiber reinforced plastic cylindrical structure. The landscape green space is a submerged multi-layer concentric elliptical water distribution. 60t/d. After being treated by septic tanks, the domestic sewage in concentrated residential areas is discharged into the regulating tank at the front end of the integrated pool. After passing through the water collection system at the upper end of the regulating tank, it enters the anaerobic hydrolysis section from the bottom. The anaerobic hydrolysis section is equipped with spherical Filling, after the upper part collects water, it enters the aerobic section from the bottom. The aerobic section is equipped with spherical packing and is equipped with a jet aerator. After the upper part collects water, it enters the secondary settling tank through the guide tube. The submersible sewage pump is connected to the jet aerator at the front end and the regulating tank. Rely on the pump for jet aeration, and return a part of the sludge to the regulating tank, and the regulating tank discharges sludge regularly. After collecting water from the upper part of the secondary settling tank, the clear water enters the clear water tank ^, and the effluent from the clear water tank flows into the landscape green land by itself.

Implementation Example 2

The specific process is shown in Figure 2. The implementation site is a place in southern Jiangsu Province. The anaerobic hydrolysis + micro-dynamic aerobic integrated pool adopts a steel concrete structure. 50t/d, the domestic sewage in the residential area is discharged into the small river, and the water of the small river enters the anaerobic hydrolysis tank at the front end of the integrated pool after being lifted. The oxygen section and the aerobic section are equipped with combined elastic packing and a jet aerator. The upper part of the aerobic section collects water and enters the secondary settling tank through the guide tube, and the sludge from the secondary settling tank enters the sludge well. The sludge well is equipped with a A submersible sewage pump with a power of 0.55KW is connected to the jet aerator at the front end and the anaerobic hydrolysis tank. The pump is used for jet aeration, and part of the sludge is returned to the anaerobic hydrolysis tank, and the sludge is discharged from the adjustment tank at regular intervals. After collecting water from the upper part of the secondary settling tank, the clear water enters the clear water tank, and the effluent of the clear water tank flows into the landscape green area ^by itself.

The results of engineering practice show that the above two processes and devices have the advantages of stability, good treatment effect, less sludge, low investment and operation costs, and beautiful scenery. After the sewage is treated, the quality of the effluent is good. COD, BOD ₅ , SS, etc. have reached the first-level B standard of the "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" (GB18918-2002), and the removal rate of TN and TP has reached more than 50%.

Claims (7)

1. microkinetic dispersion type domestic wastewater treatment process, be meant utilize anaerobic hydrolysis-microkinetic aerobic-combination process of landscape green space carries out the method for microkinetic low-cost processes to sanitary sewage, comprises the following order step:

A) with sanitary sewage by water distributor from flowing into the anaerobic fixed film reactor acidification that is hydrolyzed;

B) carry out aerobic treatment with introducing aerobic reactor after anaerobic hydrolysis processing sewage afterwards catchments in the step a);

C) waste water after the aerobic treatment in the step b) is flowed into landscape green space certainly by the back of catchmenting, the water outlet discharging;

2. the combination process that is used for sanitary sewage disposal according to claim 1, it is characterized in that: equalizing tank (can select for use), anaerobic fixed film reactor, aerobic biochemical pond, second pond, sewer catch basin (can select for use) and the integrated pond of clean water basin, its structure can select for use glass reinforced plastic, steel concrete, brick to mix, and preferentially selects glass reinforced plastic and Reinforced Concrete Structure.

3. the combination process that is used for sanitary sewage disposal according to claim 1, in the anaerobic fixed film reactor oxygen hydrolysis pond of becoming reconciled water distribution, captation and filler are set, filler can be selected fillers such as Ball-type packing, elastic filler, soft-filler, preferentially selects combined elastic biologic packing material efficiently.

4. the combination process that is used for sanitary sewage disposal according to claim 1, supporting jet aerator is set in aerobic reactor, a pump is set in settling tank or sewer catch basin, pump, jet aerator and aeration tube are connected, and before jet aerator, draw mud return line to equalizing tank or anaerobic fixed film reactor.

5. the combination process that is used for sanitary sewage disposal according to claim 1 is removed with pump and is carried out outside jet-flow aeration and the mud backflow, and all current are gravity flow.

6. the combination process that is used for sanitary sewage disposal according to claim 1, landscape green space is the undercurrent type brick mix structure, inner from laying certain thickness supporting layer, packing layer, soil and local advantage green plants down, wherein supporting layer and packing layer consider to have certain adsorptive power stone, the preferential Wingdale of selecting, rhombspar, each layer thickness and granular size are through certain allotment.

7. the landscape green space that is used for according to claim 6, laid inside water distributor and aqueduct, the landscape green space outer ring is a braiding channel, the back discharging is collected in water outlet.The green plants of the local advantage of plantation on the soil.

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