CN104478158A - Sewage treatment method - Google Patents

Abstract

The invention discloses a sewage treatment method, large floating objects in sewage are removed by a coarse grille in a plant, then the sewage flows into a water collecting pool; the sewage is lifted to a combined rotating fine grille with smaller mesh than that of the coarse grille by a vertical sewage pump, debris and sand are separated from the sewage by the combined rotating fine grille; effluent treated by the rotating fine grille enters into an anaerobic tank, flowing-in water is mixed with anaerobic sludge for anaerobic treatment; the anaerobically treated sewage flows into a biochemical pool, a compound bacteria agent is first added when the anaerobically treated sewage flows into the biochemical pool, a catenary aerator is used for oxygenation by aeration for aerobic treatment, the treated sewage is precipitated and then aerated for oxygenation for stabilization, the sewage flows automatically into a disinfection pool, and after the disinfection, the sewage is discharged. The sewage treatment method has the advantages of low investment, high efficiency, large sludge recycle flow rate and simple process, in order to improve sewage treatment capacity, an effective microbial iinoculum is added in the running process, all kinds of pollutants can be effectively degraded, odor can be removed, and pollution load can be reduced.

Description

sewage treatment method

technical field

The invention relates to the field of water treatment, in particular to a sewage treatment method.

Background technique

With the rapid development of the national economy, the continuous expansion of cities and the rapid development of urbanization, the total discharge of urban industrial wastewater and domestic sewage has also increased year by year. If untreated wastewater and sewage are directly discharged into natural water bodies, it will not only seriously pollute the water quality of rivers, lakes, reservoirs and groundwater, but also spread a large number of germs, viruses, harmful substances and harmful gases, affecting the quality of life of the people and good health.

Facing the pressing water crisis, the Chinese government has made urban sewage treatment and water recycling technology, industrial wastewater treatment and recycling industrial technology, water-saving technology and equipment as the current national priority development of environmental protection industries and key areas.

In recent years, the construction of urban sewage treatment plants across the country has gradually received attention, and sewage treatment plants have been incorporated into municipal infrastructure. But the speed of construction is far behind the needs of pollution prevention and control.

At present, my country's sewage treatment mainly adopts aerobic biological membrane treatment technology, that is, AAOM process. Due to its high construction investment, high construction equipment requirements, high operation and treatment costs, management and maintenance costs, large sludge output, and low treatment efficiency (commonly known as the "three highs and one low" process), the sewage treatment industry in my country is struggling, and even There is an embarrassing situation where sewage treatment plants are "affordable to build but unusable". Therefore, there is an urgent need to develop new technologies for urban sewage treatment that are efficient, practical, and economical and suitable for my country's national conditions.

Contents of the invention

In view of the shortcomings and deficiencies in the prior art above, the purpose of the present invention is to provide a sewage treatment method with low input cost, low sludge output and high treatment efficiency.

The purpose of the present invention is achieved through the following technical solutions:

A sewage treatment method, the sewage is passed through the coarse grid to remove large floating objects in the factory, and then flows into the sump; the sewage is lifted by the vertical sewage pump to the combined rotating fine grid with smaller mesh size than the coarse grid, The combined rotating fine grid separates sundries and sand from the wastewater; the effluent treated by the rotating fine grid enters the anaerobic tank, and the propeller mixes the influent and anaerobic sludge for anaerobic treatment; The sewage after oxygen treatment flows into the biochemical tank, and when it flows in for the first time, a composite bacterial agent composed of photosynthetic bacteria, lactic acid bacteria, yeast bacteria, Gram-positive actinomycetes and fermented filamentous bacteria is added to form probiotics The group uses catenary aerator to aerate and oxygenate for aerobic treatment; the treated sewage is aerated and oxygenated after sedimentation to stabilize it, and the sewage flows into the disinfection tank by itself, and is discharged after disinfection.

Preferably, the sludge generated after sedimentation is sent to the sludge thickening tank with a sludge pump, and the sludge is then sent to a belt filter press for dehydration by a screw pump after being concentrated; The filtrate produced by the machine flows into the sump for secondary treatment.

Preferably, the oxygen required during aeration and clarification is supplied by fans.

Compared with the prior art, the embodiments of the present invention have at least the following advantages:

In the embodiment of the present invention, this sewage treatment method has low investment, high efficiency, large sludge return flow, and simple process. In order to improve the sewage treatment capacity, effective microbial agents are added during the operation process, which can effectively degrade various pollutants. Remove odor and reduce pollution load. Microorganisms can operate at normal temperature and pressure, not only low energy consumption, good water discharge effect, but also no secondary pollution. The effluent water quality has reached the second-grade water standard of GB8979-96, and further treatment can be considered for reuse.

Detailed ways

Below in conjunction with embodiment the present invention is described in further detail, following embodiment is only descriptive, not restrictive, can not limit protection scope of the present invention with this.

In the factory, the sewage first passes through the coarse grid to remove large floating objects, and then flows into the sump. The sewage is lifted to the combined rotary fine screen by the vertical sewage pump. The combined rotary fine screen can separate sundries and sand particles from the waste water and remove part of the organic load at the same time. The effluent treated by the rotating fine grid first enters the anaerobic tank, and the propeller mixes the influent water and anaerobic sludge for anaerobic treatment, and then flows into the biochemical tank by itself, and the effective microbial agent developed by us (based on photosynthesis) is added to the initial operation. Bacteria, lactic acid bacteria, yeast, gram-positive actinomycetes, and fermented filamentous bacteria, which are composed of more than 80 kinds of microorganisms in 10 genera and 5 categories, thus forming a powerful probiotic flora, Decompose oxidized organic matter through oxidation, reduction, fermentation, etc., which can effectively degrade organic matter, inhibit and kill various harmful bacteria, inhibit the spread of epidemic pathogenic microorganisms, eliminate common odors such as hydrogen sulfide and ammonia, and play a role in improving the environment. ), the catenary aerator is used to aerate and oxygenate for aerobic treatment, and the treated sewage is aerated and oxygenated after sedimentation to stabilize it. The sewage flows into the disinfection tank and is discharged after disinfection. The sludge produced by sedimentation is sent to the sludge thickening tank by the sludge pump, and then the sludge is concentrated and then sent to the belt filter press for dehydration by the screw pump. The supernatant from the sludge thickening tank and the filtrate from the filter press flow into the sump for secondary treatment. The oxygen required for the aeration and clarification process is supplied by the fan, the mechanical debris generated by the pretreatment facility is transported to landfill, and the remaining sludge is used as agricultural fertilizer.

The process characteristics of the sewage treatment method:

Low investment: Due to the use of earthen ponds and anti-seepage measures, the construction cost per ton of water is about 800-1000 yuan, while the construction cost of AAOM process is about 3000-3200 yuan per ton of water. Therefore, the required cost of the water treatment method in the present invention is much lower than the construction cost of other process sewage treatment plants. In addition, it has a small footprint and is arranged according to local conditions without being affected by terrain.

According to the "Investigation and Research on Industrial Wastewater Treatment Facilities" issued by the National Environmental Protection Agency in 1992, 54% of the funds for industrial wastewater treatment facilities in my country are used for civil engineering facilities, while only 36% are used for equipment. The main reason for this investment allocation pattern is Most of the craft pools use expensive reinforced concrete pools. The civil engineering cost of Longtian Sewage Plant only accounts for 20% of the total investment. Large reinforced concrete pools are not only expensive, but also difficult to construct. In order to reduce investment, the aeration tank adopted in the present invention first uses HDPE anti-seepage membrane to isolate sewage and groundwater, and secondly, the microporous aeration head suspended on the floating pipe avoids perforation installation at the bottom of the tank and the wall. This kind of earth pond with HDPE anti-seepage membrane is not only easy to excavate and low in investment, but also can fully meet the functional requirements of sewage treatment ponds, and can adapt to local conditions and adapt to the terrain of the site. Under certain special geological conditions, Such as earthquake-prone areas and loose soil areas, its advantages are more fully reflected. The service life of the earth pond with HDPE anti-seepage membrane is far longer than that of the reinforced concrete pond.

High efficiency: Using the mobile aeration chain system floating on the water surface, there is a microporous aeration head at the bottom, and the aeration efficiency is high. The aerator is installed beside the pool with low energy consumption. Energy consumption is only about 1/2 to 1/3 of traditional sewage treatment.

Traditional sewage treatment rarely uses low-load activated sludge systems because there are no efficient and reasonable processes and aerators. The development of C-BIOLAK aerator (BIoLAK-FluoX) has opened up a wider world for the application of this process that we are already familiar with and has achieved certain effects. The energy consumption required for mixing in the system aeration tank using C-BIOLAK aerator is only 1.5 watts/m ³ , while the energy consumption for mixing in the general traditional aeration method is 10-15 watts/m ³ , This is undoubtedly a very valuable improvement.

Large sludge return flow: During the operation, 30-40% of the sludge is consumed by microorganisms, and another 30-40% of the sludge is refluxed for treatment. The remaining sludge is 20-30% of the traditional process and can be stored for a long time. It rots, does not produce odor, and can be used as agricultural fertilizer after being dried in the storage pool. The C-BIOLAK process has large sludge return flow, high sludge concentration, large biomass, and relatively long aeration time, so the sludge load is low.

Simple process: This process starts quickly, and is easy to operate, manage, and maintain. After stable operation, the operating cost per ton of sewage is low, which is about 1/3 to 1/4 of the traditional method. There is no need to vent or stop production for repairs. Due to the special structure of the C-BIOLAK microporous aerator (BloLAK-FluoX), the aerator will not be blocked even in a very complicated environment, which means that the aeration device can run for several years without maintenance, reducing maintenance The workload, so the maintenance cost is very little. The C-BIOLAK process uses a large amount of return sludge, and its residual sludge is much less than the traditional process. There is no need for any treatment before using the sludge, so the cost of sludge treatment is also very low.

The C-BIOLAK system has no underwater fixed parts, and there is no need to drain the water in the pool during maintenance, but just use a boat to lift the aeration head under the aeration chain to the maintenance site. Practice shows that the aeration head does not need any maintenance after several years of operation, mainly because the aeration tube is made of very thin fibers (about 0.003mm in diameter) and filled with polymers to achieve the purpose of waterproofing and anti-dirt . At the same time, the aerator head has about 80% free space and 20% surface area, which is just the opposite of the traditional aerator head. As a result, the microbes have a small area to grow and are easily removed. When the aeration head must be maintained, it does not affect the operation of the entire sewage treatment plant. The process has very few moving and aging parts. When selecting equipment and materials, reliable and durable materials are used. The process does not require much automation. It does not require any fragile detectors nor any complex control system.

In order to improve the sewage treatment capacity, effective microbial agents are added during operation, which can effectively degrade various pollutants, remove odors, and reduce pollution loads. Microorganisms can operate at normal temperature and pressure, not only low energy consumption, good water discharge effect, but also no secondary pollution. The effluent water quality has reached the second-grade water standard of GB8979-96, and further treatment can be considered for reuse.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (3)

1. a sewage water treatment method, is characterized in that, comprises successively by step:

S1, first removes large floating matter through coarse rack by sewage, then flows into water collecting basin in factory;

S2, sewage is promoted to the Assembled rotary fine fack little compared with coarse rack mesh through vertical sump pump, and Assembled rotary fine fack is separated foreign material and sand grains from waste water;

S3, the water outlet after rotating fine fack process enters anaerobic pond, by thruster, anaerobic treatment is carried out in water inlet and anaerobic sludge mixing;

S4, sewage after anaerobic treatment flows into biochemistry pool, add when flowing into first with the composite fungus agent of the thread fungus group of photosynthetic bacteria group, lactobacillus, yeast flora, Gram positive actinomycetes group and fermentation composition, form probiotic bacterium flora, utilize the oxygenation of suspensive chain type aerator aeration to carry out aerobic treatment;

S5, the sewage after process, carry out aeration aerating after precipitation again and stablize, sewage self-flowing enters sterilization pool, discharge after sterilization.

2. sewage water treatment method according to claim 1, is characterized in that, the sewage in S5 produces mud after precipitation, and sludge thickener sent into by the mud sludge pump of generation, and mud is sent into belt filter press by spiral pump again and dewatered after concentrated; The supernatant liquor that sludge thickener produces and the filtrate that pressure filter produces are from flowing into water collecting basin secondary treatment.

3. sewage water treatment method according to claim 1 and 2, is characterized in that, the oxygen needed in aeration and clarifying process is supplied by blower fan.