Printed circuit board integrated wastewater resource utilization method

A printed circuit board and comprehensive wastewater technology, which is applied in the field of environmental protection and environmental engineering, can solve the problems of large floor area, non-recyclable wastewater, and large sludge production, so as to realize recycling, complete system, and unified economic benefits Effect

Inactive Publication Date: 2011-07-13
SOUTHEAST UNIV
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Problems solved by technology

At present, the comprehensive wastewater of printed circuit board factories is mainly discharged directly after simple coagulation sedimentation and biological contact o

Method used

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  • Printed circuit board integrated wastewater resource utilization method
  • Printed circuit board integrated wastewater resource utilization method

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Embodiment Construction

[0020] 1) pH adjustment: The pH of PCB comprehensive wastewater is generally between 2 and 3. The adjustment tank is equipped with an automatic online pH control device and a mixer, and the pH is raised to about 8 to ensure the best coagulation and precipitation conditions for copper ions.

[0021] 2) Coagulation and sedimentation: the effluent from the pH adjustment tank is pumped into the high-level water tank, and then flows into the coagulation tank through the high-level water tank. Added in the pipeline, the concentrations of PAC and PAM were 5% and 0.1%, respectively. The mechanical coagulation tank is divided into three grids, the number of revolutions of the impeller can be adjusted according to the water quantity and quality, and the number of revolutions of the stirring impeller decreases step by step to facilitate the formation of flocs. The vertical partition walls with water holes are used to guide the flow between the cells of the coagulation tank. The positions...

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Abstract

A printed circuit board (PCB) integrated wastewater resource utilization method is used in a complete process system of PCB integrated wastewater treatment and resource utilization used in the PCB enterprise. The method is as follows: the PCB integrated wastewater performs the pretreatment and advanced treatment adopting a pH adjusting tank, a flocculating tank, a setting tank, a biological activated filter and an ultrafiltration and reverse osmosis process, and the effluent can be reused as the production line water; and the biological activated filter uses multiple layers of medium to replace the conventional combined process of the sand filter and the activated carbon tank, thus the physical filtering effect of the suspended matter can be ensured and the organic matter can be degraded through biological method. The mud separated by the setting tank enters a sludge concentration tank to concentrate, the concentrated mud enters a mud storage tank and a box-type filter press through an air isolation pump, the volume of the pressed sludge is reduced, after the obtained mud is roasted, purified, crushed and soaked in acid, the copper ions in the sludge are completely transferred to the acidic solution. The acidic solution containing copper is electrolyzed to recycle copper and sulfuric acid which have better qualities.

Description

technical field [0001] The invention relates to industrial wastewater treatment engineering technology in the field of environmental engineering, in particular to an advanced technology applied to comprehensive wastewater treatment and resource recovery of printed circuit boards, and belongs to the technical field of environmental protection. technical background [0002] In recent years, with the rapid development of the electronics industry, the demand for printed circuit boards (referred to as PCB) has greatly increased, and the production of PCBs has become an important basic industry in the electronics industry. my country's electronics industry is developing rapidly, and the output value of the PCB industry is increasing by about 20% every year. By 2006, it will be named the world's largest producer with an output value of nearly 13 billion US dollars. The PCB industry is a major user of water and waste water, causing serious environmental pollution. At present, the c...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 吕锡武肖亚娟李金荣马素梅
Owner SOUTHEAST UNIV
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