based on a 2 System and method for synchronous denitrification, phosphorus and algae reduction in /o process

A simultaneous denitrification, phosphorus, and treatment system technology, applied in the field of simultaneous denitrification, phosphorus, and algae reduction treatment systems, can solve the problem of difficulty in further improving nitrogen removal efficiency, poor winter operation and treatment effects, and asynchronous denitrification, phosphorus, and algae reduction, etc. problems, to achieve the effect of reusing waste, reducing secondary pollution, and enriching the number of populations

Inactive Publication Date: 2017-05-24
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the increase of dredging projects, the amount of dredged sediment produced by various dredging projects is increasing day by day, and the conventional disposal methods such as stockpiling, dredging and throwing into the sea have caused potential adverse effects on the environment
[0012] Therefore, the existing treatment methods for denitrification, phosphorus removal and algae reduction have problems such as asynchronous denitrification, phosphorus removal and algae reduction, high cost of algae removal, easy to form secondary pollution, difficulty in further improving nitrogen removal efficiency, and poor winter operation treatment effect.

Method used

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  • based on a <sup>2</sup> System and method for synchronous denitrification, phosphorus and algae reduction in /o process
  • based on a <sup>2</sup> System and method for synchronous denitrification, phosphorus and algae reduction in /o process

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preparation example Construction

[0067] Further, the preparation method of the reinforced flocculant in the step 1 comprises the following steps:

[0068] Step 1.1, collecting the sediment produced by the dredging project and having a water depth greater than 1.0-1.5m;

[0069] In step 1.2, the bottom mud collected in step 1.1 is naturally air-dried for several days, then crushed and passed through a 2mm sieve to obtain a bottom mud sample with a particle size of less than 2mm;

[0070] In step 1.3, uniformly mix the sediment sample obtained in step 1.2 with a typical flocculant, and the mixing ratio of the sediment sample to the typical flocculant is between 5:1 and 10:1.

[0071] Further, the natural air-drying temperature in the step 1.2 is 25±1° C., and the natural air-drying time is 7 days.

[0072] Further, the typical flocculant is any one or more of the following:

[0073] Polyaluminum Chloride (PAC);

[0074] Basic aluminum chloride;

[0075] Aluminum sulfate;

[0076] Polyacrylamide (PAM);

[...

Embodiment 1

[0097] In this embodiment, wastewater treatment is carried out on the water of a certain lake. The lake water is in a state of eutrophication and gradually transforms into heavy eutrophication. / L, nitrate nitrogen 0.3mg / L, total nitrogen 25.8mg / L, total phosphorus 0.33mg / L, chlorophyll 58.4mg / L, suspended matter 34.00mg / L.

[0098] Aerobic pool size, length × width × height: 50m × 6m × 5.0m (effective height 4.5m), volume V 1 : 1500m 3 , sludge age 9d, hydraulic retention time 3.9h; anoxic tank size, length × width × height: 41m × 6m × 5.0m (effective height 4.5m), volume V 1 : 1230m 3 , the hydraulic retention time is 3.3h; the size of the anaerobic tank, length × width × height: 20m × 6m × 5.0m (effective height 4.5m), volume V 1 : 600m 3 , the hydraulic retention time is 1.5h; the size of the pre-sedimentation pre-denitrification tank, length × width × height: 6m × 5m × 4.0m (effective height 3.5m), volume V 1 : 120m 3 ;Under this operating condition, the effluent wa...

Embodiment 2

[0100] In this embodiment, a simulated lake water is treated, and the density of Microcystis aeruginosa algae is about 8×10 in the simulated lake water. 7 cells / L, chlorophyll a500mg / m 3 , total nitrogen 12mg / L, total phosphorus 0.8mg / L.

[0101] Aerobic pool size, length × width × height: 50m × 6m × 5.0m (effective height 4.5m), volume V 1 : 1500m 3 , sludge age 9d, hydraulic retention time 3.9h; anoxic tank size, length × width × height: 41m × 6m × 5.0m (effective height 4.5m), volume V 1 : 1230m 3 , the hydraulic retention time is 3.3h; the size of the anaerobic tank, length × width × height: 20m × 6m × 5.0m (effective height 4.5m), volume V 1 : 600m 3 , the hydraulic retention time is 1.5h; the size of the pre-sedimentation pre-denitrification tank, length × width × height: 6m × 5m × 4.0m (effective height 3.5m), volume V 1 : 120m 3 ;Under this operating condition, the effluent water quality of the sedimentation tank is: the removal rate of chlorophyll a is 100%, wh...

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Abstract

The invention discloses an A<2> / O process based simultaneous nitrogen and phosphorus removal and algae reduction treatment system, which includes a precipitation pre-denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank and a precipitation tank that are connected in order. The precipitation pre-denitrification tank is disposed at the front end of the anaerobic tank. The precipitation pre-denitrification tank strengthens the denitrification effect through landfill gas micro-aeration, and is provided with a mixture of bottom mud and a typical flocculant to serve as a reinforcing flocculant for flocculent precipitate removal of blue algae. Deoxidized landfill gas is employed to conduct aeration on the anaerobic tank and the anoxic tank, thereby reinforcing phosphorus release and denitrification. The mixed gas of landfill gas and air is employed to perform aeration on the aerobic tank, thus reinforcing removal of COD and nitrification and phosphorus absorption. The invention also provides a treatment method for the treatment system. The system and the method provided by the invention realize simultaneous nitrogen and phosphorus removal and algae reduction, fundamentally solve the problems brought about by eutrophication, and have the characteristics of high nitrogen and algae removal efficiency, stable treatment effect, and low operation cost, etc.

Description

technical field [0001] The invention relates to a treatment method for denitrification, dephosphorization and algae reduction in the technical field of water treatment, in particular to a method based on A 2 A treatment system and method for synchronous denitrification, dephosphorization and algae reduction of / O process. Background technique [0002] Eutrophication refers to the fact that a large amount of nitrogen, phosphorus, potassium and other elements are discharged into the surface water body with slow flow rate and long renewal cycle, which makes algae and other aquatic organisms grow and reproduce in large numbers, and the rate of organic matter production is far faster than that of water. The rate of consumption, the accumulation of organic matter in the water body, and the process of destroying the balance of aquatic ecology. A common phenomenon that accompanies eutrophication is an increase in phytoplankton, especially those buoyant or motile algae, which often ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 吴睿彭禹洪超陈丹杨昉婧李道进沈明霞
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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