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Siderite active sand dephosphorization method

A kind of siderite and active technology, applied in the field of advanced treatment of micro-polluted source water, can solve the problems of high price and little prospect

Active Publication Date: 2014-05-14
HEFEI UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Adsorption materials modified with rare earth elements have high phosphorus removal efficiency, but are expensive and have little prospect for popularization and application

Method used

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  • Siderite active sand dephosphorization method
  • Siderite active sand dephosphorization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Non-limiting examples are described below.

[0019] Choose siderite ore, the siderite content is not less than 30%;

[0020] Crush and screen siderite ore to obtain 0.25-0.5mm particles;

[0021] Fill the siderite particle filter material into a sand filter column constructed of a glass tube with a diameter of 30mm and a height of 1000mm;

[0022] Prepare simulated water with a phosphorus concentration of 1.0mg / L, and operate it with a hydraulic retention time of 3 hours for wastewater phosphorus removal treatment;

[0023] Samples were taken every 5 days to detect the phosphorus concentration in the water, and the phosphorus concentration in the effluent remained below 0.1 mg / L after 225 days of operation (see figure 2 ), the phosphorus removal rate is greater than 90%, and the phosphorus concentration in the effluent reaches the second-class standard for surface water bodies.

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Abstract

The invention discloses a method for deep dephosphorization of wastewater by using siderite as a sand filter filtering material. The method is characterized by comprising the steps of crushing and screening natural siderite ore to obtain 0.25-0.5mm particles, filling a sand filter by using the particles as filler, and carrying out deep dephosphorization on low-concentration phosphorus wastewater via a filter manner. The principle is that the siderite is slowly oxidized by the dissolved oxygen in the water to form newly born ferrihydrite (iron hydroxide) and the newly born ferrihydrite adsorbs to remove the phosphor in the water. Through regular back washing, the ferrihydrite membranes on the surfaces of the particles fall off, so that the oxidization dephosphorization of the siderite is restored. The method provided by the invention is suitable for the deep dephosphorization of domestic wastewater, landscape water and polluted river water.

Description

1. Technical field [0001] The invention relates to a method for advanced treatment of slightly polluted source water. 2. Background technology [0002] With the rapid economic development and urbanization, coupled with the excessive application of farmland chemical fertilizers, the loss of nitrogen and phosphorus is serious, and a large amount of nutrients nitrogen and phosphorus enter lakes and other water bodies, causing serious eutrophication in lakes such as Chaohu Lake, Taihu Lake, Dianchi Lake and urban landscape water bodies. The state has set up a major special project for water pollution control to conduct research, invested huge sums of money in the construction of urban sewage treatment facilities, and improved the treatment rate of urban domestic sewage. However, at present, the aerobic activated sludge process is generally used in the treatment of urban domestic sewage, but the concentrations of total nitrogen and total phosphorus in the effluent water of aerobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/58C02F3/00C02F3/34B09B3/00
Inventor 庆承松陈天虎邢波波杨哲
Owner HEFEI UNIV OF TECH
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