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Integrated circulating fluidized bed for sewage nitrogen and phosphorus recycling

A fluidized bed, fluidized bed reactor technology, applied in the direction of phosphorus compounds, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of small struvite crystals, affecting quality, and difficult to separate from water, etc. question

Inactive Publication Date: 2017-03-22
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the domestic and foreign researches on the recovery of nitrogen and phosphorus by struvite method are in the stage of laboratory research. Because the struvite crystals produced are so small that it is difficult to separate them from water, or the purity decreases, which affects the quality, so ordinary precipitation equipment is difficult to use. Recovery of Nitrogen and Phosphorus by Struvite Precipitation

Method used

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  • Integrated circulating fluidized bed for sewage nitrogen and phosphorus recycling

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Effect test

Embodiment 1

[0020] Embodiment 1 intermittent operation

[0021] For nitrogen and phosphorus wastewater with a small amount of water, the fluidized bed adopts intermittent operation mode, and the water flow is in the form of internal circulation. When the treatment reaches the standard, the fluidized bed itself acts as a sedimentation tank to separate struvite from water. The specific implementation process is:

[0022] Such as figure 1 As shown, a fluidized bed reactor for sewage nitrogen and phosphorus recovery is mainly composed of a cylindrical overflow water outlet area 17, a fluidized bed, a circulating water pump 8, a water distribution tank 1, a rotameter 11, a circulating pipeline, and a valve. It is characterized in that the fluidized bed consists of a cylindrical crystallization zone 16 and a conical crystallization zone 15 from bottom to top, the bottom of the water distribution tank 1 is connected to the circulating water pump 8 through a pipeline, and a rotameter 11 is prov...

Embodiment 2

[0036] Embodiment 2 continuous operation

[0037] In the case of continuous water inflow, the implementation of the fluidized bed can be switched to continuous operation. The specific operation method is:

[0038] The water distribution tank 1 is removed, and the fluidized bed water inlet 13 is connected to the high-concentration nitrogen and phosphorus wastewater from the sewage plant workshop. The treated water passes through the perforated pipe 21 and enters the return pipe 22. The water flow is divided into two paths, and the water from one path enters the return pipe valve 25 Carry the struvite particles back to continue crystallization and granulation; the other way of water flows through the drain pipe 24 and is connected to the sedimentation tank. The small particles of struvite along this way are collected in the sedimentation tank. The large-sized struvite remaining in the fluidized bed will be deposited on the wall of the device, and enter the struvite collection st...

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Abstract

The invention provides an integrated circulating fluidized bed for sewage nitrogen and phosphorus recycling. The fluidized bed reactor for sewage nitrogen and phosphorus recycling is mainly composed of a fluidized bed, a cylindrical overflow water outlet area, a circulating water pump, a water distribution box, a rotor flow meter, circulating pipelines and valves; the fluidized bed sequentially comprises a conical crystallization area and a cylindrical crystallization and precipitation area from bottom to top, the bottom of the water distribution box is connected with the circulating water pump through a pipeline, and the rotor flow meter is arranged on a connecting pipe section; a water outlet of the circulating water pump is connected with the cone tip of a cone arranged at the bottom of the fluidized bed; the top end of the cylindrical crystallization and precipitation area is connected with a catchment cofferdam, and pores are formed in the bottom of the cofferdam to be connected with a water outlet pipe section and a return pipe section; a return pipe is connected into the water distribution box from the upper end of the water distribution box; a chemical putting system is composed of a basic magnesium carbonate dissolving tank, an ammonium chloride dissolving tank, a metering pump and a chemical adding pipeline and is connected with the lower portion of the conical crystallization area.

Description

technical field [0001] The invention relates to water pollution control engineering and resource recovery and utilization technology, in particular to a circulating integrated fluidized bed for simultaneous recovery of nitrogen and phosphorus in sewage plant wastewater. Background technique [0002] Phosphorus is a non-renewable and irreplaceable mineral resource. The current reserves in the world can no longer meet the needs of future social development. However, a large amount of nitrogen and phosphorus produced in industrial and agricultural production enters water bodies, causing serious water eutrophication. It has become one of the most important environmental issues facing our country. The discharge of urban sewage is an important way for nitrogen and phosphorus to enter water bodies. Therefore, recycling phosphorus resources in urban sewage has important practical significance for reducing nitrogen and phosphorus emissions and protecting the environment. Magnesium a...

Claims

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Application Information

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IPC IPC(8): B01D9/02C02F1/52C01B25/45
CPCB01D9/0036C01B25/451C02F1/5236C02F2001/5218
Inventor 王亚娥李文譞李杰
Owner LANZHOU JIAOTONG UNIV
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