Wastewater treatment apparatus and control method thereof

Abstract

The invention relates to the technical field of desulfurization wastewater pretreatment, and discloses a wastewater treatment device, which comprises a configuration system, a storage system, a firstconveying system, a neutralization system, a second conveying system and a control system, and is characterized in that the control system is electrically connected with a first liquid level meter, aconveying pump, a dosing pump and a PH detector; the invention also discloses a control method for the wastewater treatment system, which comprises the following steps: acquiring the pH value in the neutralization tank, comparing the pH value with a preset pH value, and controlling the frequency of the dosing pump according to the pH value comparison result, thereby controlling the amount of limeemulsion added into the neutralization tank by the chemical storage tank; and obtaining liquid level information of the medicine storage box, and controlling the opening and closing of the conveying pump according to the liquid level information. According to the device and the control method, the structure is simple, the operation is easy, the lime emulsion preparation precision and the neutralization tank pH value regulation precision are improved, the labor intensity of personnel is reduced, and meanwhile, the safe and stable operation of a desulfurization wastewater pretreatment system isimproved.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater pretreatment, in particular to a wastewater treatment device and a control method thereof. Background technique [0002] At present, in the desulfurization wastewater pretreatment system of power plants, lime emulsion is widely used to neutralize the desulfurization wastewater to adjust the pH value of the wastewater, so that most of the heavy metal ions in the wastewater form insoluble hydroxides and then perform solid-liquid separation to remove heavy metals in the wastewater. In this technology, it is necessary to transport the dry lime powder in the lime dry powder silo to the lime emulsion configuration box and mix it with water to form a lime emulsion with a certain concentration, then transfer the configured lime emulsion to the lime emulsion storage tank, and then pass the lime The dosing pump of the emulsion medicine storage tank feeds the lime emulsion into the neutral...

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Problems solved by technology

[0006] 3. When the desulfurization wastewater neutralization tank is in operation, it is necessary to add lime emulsion to adjust the pH value of the wastewater to the required range of 9 to 9.5. During operation, adjust the amount of lime emulsion added by adjusting the operating frequency of the lime emulsion dosing pump, and there is an adjustment of the dosage of lime emulsion The pH adjustment value of the neutralization tank changes greatly if it is not timely and out of sync, which affects the effect of removing heavy metals in wastewater treatment

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