Device and method for removing and recovering cationic heavy metals in organic acid wastewater by using aerobic granular sludge

Abstract

The invention discloses a device and a method for removing and recovering cationic heavy metals in organic acid wastewater by using aerobic granular sludge. The device comprises an adjusting tank anda reaction tank, wherein the adjusting tank comprises a pH electrode of the adjusting tank, an alkali liquid inlet pipe, a stirring motor, a stirring rod, a stirring paddle and an adjusting tank waterinlet pipe; the reaction tank comprises a pH electrode of the reaction tank, a solenoid valve, a first aeration head, a separation screen, a second aeration head, a precipitation disturbance preventer and a reaction tank water inlet pipe, and the adjusting tank water outlet pipe is connected with the reaction tank water inlet pipe. When the reaction tank is in normal operation, the second aeration pump is used for aeration; at that end of the reaction, a first aeration pump is turned on in a pulse mode for aeration, so that the heavy metal precipitation microspheres formed on the surface of the aerobic granular sludge are dropped, and the precipitation microspheres are separated through a separation sieve and collected in a sludge hopper of the reaction tank, thereby realizing the recovery of heavy metal from the wastewater. The invention can simultaneously remove organic matter and heavy metals in wastewater, and effectively recover heavy metals therein.

Description

technical field [0001] The invention belongs to the field of water treatment equipment, and in particular relates to a device and method for removing and recovering cationic heavy metals in organic acid wastewater by using aerobic granular sludge. Background technique [0002] Wastewater containing heavy metals mainly comes from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, etc. It is one of the most serious water pollution and the greatest harm to human beings. Research on the removal and recovery of heavy metals in wastewater has an important effect on the environment and human beings. [0003] The traditional wastewater treatment process transfers heavy metals in wastewater to solid substances through adsorption, precipitation and other methods, consumes a large amount of chemical reagents, and produces a large amount of solid waste containing heavy metals. However, the content of heavy metals in th...

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Problems solved by technology

[0003] The traditional wastewater treatment process transfers heavy metals in wastewater to solid substances through adsorption, precipitation and other methods, consumes a large amount of chemical reagents, and produces a large amount of solid waste containing heavy metals. However, the content of heavy metals in these solid wastes is often relatively low, and It does not have the value of recycling, and landfill disposal may cause re-release and pollute the environment

In addition, in traditional treatment methods, one reactor unit can only treat one type of pollution; for wastewater polluted by complex pollutants, a series of reactor units need to be connected in series to remove pollutants one by one, which not only increases the complexity of the process Sexuality, but also increased reactor manufacturing and operating costs

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