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Ceramsite for heavy metal wastewater treatment, preparation method and applications thereof

A technology for wastewater treatment and heavy metals, which is applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of long biological treatment cycle, few engineering cases, and low efficiency. Achieve excellent heavy metal ion adsorption and reduction performance, easy to obtain raw materials, and simple preparation methods

Active Publication Date: 2012-10-10
PEKING UNIV
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Problems solved by technology

The biological treatment cycle is long, the cost is high, and the efficiency is low. At present, there are not many engineering cases for the treatment of heavy metal wastewater

Method used

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  • Ceramsite for heavy metal wastewater treatment, preparation method and applications thereof
  • Ceramsite for heavy metal wastewater treatment, preparation method and applications thereof

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Embodiment 1

[0025] 1) Raw material pretreatment: After drying the raw material, pass through a 60-mesh sieve;

[0026] 2) Mixing of raw materials: Mix the raw materials evenly according to the following weight ratio: 80 kg of bentonite or kaolin; 10 kg of 200nm zero-valent iron powder; 10 kg of activated carbon powder;

[0027] 3) Granulation: add 20 kg of water to 100 kg of uniformly mixed raw materials, the amount of water added is 20% of the weight of the raw materials, stir and granulate to form a 5mm zero-valent iron ceramsite blank;

[0028] 4) Sintering: Dry the zero-valent iron ceramsite blank in a blast drying oven for 3 hours; then put it into an electric heating tube furnace and preheat it at a preheating temperature of 300°C for 15 minutes; Keep warm at 800°C for 1-3 hours; cool down to 150°C at a constant speed within 5 hours, and then slowly cool down to room temperature to obtain the desired ceramsite.

[0029] The use of the ceramsite in the present invention is mainly as...

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Abstract

The invention discloses a ceramsite for heavy metal wastewater treatment, a preparation method and applications thereof. Ceramsites contain bentonite or kaolin, nanoscale zero-valent iron powder or activated carbon. The ceramsite prepared by the method is 3-20 mm spherical particles with density of 1.15 g / cm<3>, bulk density of 814 kg / m<3>, strength of 5 MPa and specific surface area of 33 m<2> / gand has the advantages that the integral form is intact, the pores are developed, and the internal pores are communicated. The preparation method is shown in the specification for details. The raw materials of the ceramsite are easily obtained and are low in cost; the preparation method and the equipment used are simple and are convenient to operate; the ceramsite has excellent heavy metal ion adsorption and reduction performance; the removal efficiency for all heavy metal ions is more than 99% under the condition of high load of Cu<2+>, Zn<2+>, Pb<2+>, Cd<2+>, Cr<6+> and Hg<2+> in wastewater; the yielding water meets the third level water quality requirement of state environmental quality standards for surface water; and the ceramsite has high heavy metal adsorption capacity which is up to 50-200 mg / g. The ceramsite disclosed by the invention is mainly used as an adsorption carrier for heavy metal wastewater treatment.

Description

technical field [0001] The invention relates to a material used for heavy metal wastewater treatment and a preparation method, in particular to ceramsite for heavy metal wastewater treatment, a preparation method and an application thereof. Background technique [0002] Heavy metal wastewater has become one of the most serious environmental pollution and the most harmful to human industrial wastewater, mainly from mine drainage, waste rock field leaching water, mine tailings drainage, non-ferrous metal smelter dedusting drainage, non-ferrous metal processing factory acid Washing wastewater, electroplating factory plating washing water, iron and steel factory pickling drainage and electrolysis, pesticides, medicines, paints and dyes and other industrial wastewater. In addition, domestic sewage, landfill leachate, farmland wastewater and acid rain are also sources of heavy metal emissions. The types, contents and forms of heavy metals in wastewater vary greatly with different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/13B01J20/20B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 刘阳生袁丽吕晓蕾
Owner PEKING UNIV
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