Magnetic coagulating sedimentation treatment device for pharmaceutical wastewater and treatment process thereof

Abstract

The invention discloses a magnetic coagulation sedimentation treatment device for pharmaceutical wastewater. The magnetic coagulation sedimentation treatment device comprises a first quick mixing tank, a second quick mixing tank, a third quick mixing tank, a fourth flocculation tank, a clarification sedimentation tank and a magnetic powder recovery system which are connected in sequence, wherein air stirring devices are arranged in the first quick mixing tank, the second quick mixing tank and the third quick mixing tank; a mechanical stirring device is arranged in the fourth flocculation tank;a flocculation dosing pipe is connected with the first quick mixing tank; the magnetic powder passing through the magnetic powder recovery system is added into the second quick mixing tank; and a coagulant aid dosing pipe is connected with the third quick mixing tank. The invention also discloses a magnetic coagulating sedimentation treatment process for pharmaceutical wastewater. Air stirring isadopted in the mixing section of the magnetic coagulation sedimentation process, so that an ideal mixing flocculation effect is achieved, the sewage treatment difficulty of a subsequent treatment process is further reduced, the risk of abrasion of stirring equipment in the prior art is avoided, and the energy consumption of the system is reduced.

Description

technical field [0001] The invention relates to the field of pharmaceutical wastewater pretreatment, in particular to a magnetic coagulation sedimentation treatment device for pharmaceutical wastewater and a treatment process thereof. Background technique [0002] Wastewater from pharmaceuticals produced with grain or molasses as the main raw material mainly comes from high-concentration organic wastewater from separation, extraction, refining and purification processes, such as crystallization liquid, waste mother liquor, etc., washing wastewater from seed tanks and fermentation tanks, and cooling water from fermentation tanks Wait. The production process of most drugs includes microbial fermentation, filtration, extraction and crystallization, refining, refining and other processes. Therefore, this kind of wastewater has the following characteristics: high CODcr, high SS, complex composition, presence of biological toxic substances, high sulfate concentration, high chroma...

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Problems solved by technology

[0005] The Fenton oxidation method is used as a pretreatment process for pharmaceutical wastewater, and the following problems are found in practice: 1. The amount of sludge is doubled due to the addition of iron salts; 2. The TDS of the effluent will increase by several hundred to several thousand mg / L, adversely affect the subsequent biological treatment

3. Hydrogen peroxide is a dangerous product with high safety requirements

[0008] The air flotation method or coagulation sedimentation method is used as the pretreatment process of pharmaceutical wastewater. In practice, the following problems are found: 1. There are few suspended solids in pharmaceutical wastewater, and most pollutants exist in the wastewater in colloidal or dissolved states. The removal effect is not obvious; 2. In order to achieve a certain removal effect, it leads to a large amount of dosing and a large amount of mud discharge

Since the main component of the magnetic powder is ferroferric oxide, the specific gravity range is 5.2-5.3, in order to achieve a good mixing effect, the speed of the mixer in the mixing section will be higher than the conventional coagulation sedimentation method or air flotation method. The collision process between the magnetic powder and the mixer damage to the mixer blades;

[0012] 2. High energy consumption

The speed of the mixer increases, the power of the motor increases, and the energy consumption increases

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