Heavy metal-containing wastewater integrated treatment system

Abstract

The invention discloses a heavy metal-containing wastewater integrated treatment system, which comprises a high-temperature water source heat pump unit, a concentration crystallizer, a solid and liquid separator, a vacuum unit and a condenser, wherein a hot water output pipe, a hot water input pipe, a cold water output pipe and a cold water input pipe are arranged on the high-temperature water source heat pump unit; the hot water outlet pipe is communicated with a first liquid inlet of the concentration crystallizer; the hot water input pipe is communicated with a first liquid outlet of the concentration crystallizer; a material discharging opening of the concentration crystallizer is communicated with a liquid inlet of the solid and liquid separator; a liquid outlet of the solid and liquid separator is communicated with a material inlet of the concentration crystallizer; the cold water output pipe and the cold water input pipe are respectively communicated with the condenser; the vacuum unit is communicated with the concentration crystallizer and the condenser. The high-temperature water source heat pump unit is used for simultaneously providing heat required by evaporation and cold required by condensation for the wastewater treatment system; the efficiency is high; the energy is saved. The zero discharging of solid waste and liquid waste can be realized; the energy is saved;the environment is protected.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an integrated treatment system for wastewater containing heavy metals. Background technique [0002] Wastewater containing heavy metals, especially the wastewater produced by PCB industry and electroplating industry is quite large, and the main pollution components are mainly COD and heavy metals. In the past, the heavy metal chemical coagulation precipitation method was usually used to make the metal ions in the wastewater form hydroxide flocs with alkaline agents, and then remove them by precipitation and separation. After the heavy metal ions were removed, the wastewater went into biochemical treatment. However, this treatment method consumes a lot of chemicals, has high treatment costs, a large workload, unstable treatment effects, and cannot discharge up to the standard. [0003] At present, the more common treatment technologies for high-concentration heavy me...

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Problems solved by technology

The concentrate treated by the membrane system is difficult to deal with, neither can achieve the crystallization separation effect, nor can it reach the reuse concentration; in addition, some heavy metal wastewater is not suitable for entering the membrane system, which will damage the membrane and affect the life of the membrane; and some wastewater conductivity If the rate is too high, it is not suitable for the membrane system, which will cause no water production in the membrane system

[0008] Using reverse penetration treatment, for wastewater with low concentration and metal ion content ≤ 500mg / L, the treated effluent can continue to be used for rinsing the plated parts without affecting the rinsing effect, but for the concentrated solution with a concentration of metal ions above 500mg / L For heavy metal wastewater, the product water after treatment cannot meet the standard stably and exceeds the discharge standard value range

At the same time, it cannot be directly returned to the plating tank, which will affect the quality of the plated parts

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