A wastewater treatment device containing methyldiethanolamine, which consists of a coagulation sedimentation tank, a photocatalytic device, an anaerobic hydrolysis acidification tank and an aerobic reaction tank. The photocatalytic device consists of a cylinder, an ultraviolet lamp and a quartz It consists of a glass cover, the quartz glass cover is placed in the center of the cylinder, and the ultraviolet lamp is clamped in the quartz glass cover; the cylinder is equipped with a water inlet pipe and an outlet pipe that go down and out, and an aeration tube is installed inside the cylinder. The cavity between the body and the quartz glass cover is built with ceramic balls sintered by clay added with TiO2 powder.
A wastewater treatment process, comprising the following steps:
(1) Coagulation and sedimentation treatment to remove organic matter and suspended matter in wastewater
Add polyaluminium chloride and polyacrylamide modified with iron salts and zinc salts to the wastewater containing methyldiethanolamine in the coagulation sedimentation tank, and coagulate and settle to remove organic matter and suspended solids in the wastewater;
(2) Photocatalytic treatment to decompose methyldiethanolamine in wastewater
Pump the wastewater treated in step (1) to the photocatalytic device, control the flow rate of the wastewater at 1-3m3/h, aerate through the aeration tube, and evenly suspend the ceramic balls under the impact of water flow and airflow In wastewater, under the decomposition of ultraviolet light and the catalysis of TiO2 catalyst in ceramic balls, decompose methyldiethanolamine in wastewater;
(3) Anaerobic biochemical treatment to further decompose methyldiethanolamine in wastewater
The wastewater treated in step (2) is lifted by the pump to the anaerobic hydrolysis acidification tank, and the flow is pushed for 3-6 hours. The anaerobic bacteria in the activated sludge in the anaerobic hydrolysis acidification tank decompose the wastewater under anaerobic conditions Methyldiethanolamine in;
(4) Aerobic biochemical treatment, decomposing methyldiethanolamine and its degradation products in wastewater
The wastewater treated in step (3) is pumped into the aerobic reaction tank, and the aerobic bacteria in the activated sludge in the aerobic reaction tank decompose the methyldiethanolamine and formazan in the wastewater under aerobic conditions The formic acid, acetic acid and ammonia nitrogen after the degradation of base diethanolamine, and the treated wastewater is discharged through the discharge pipeline.
The beneficial effect of the present invention is that: the present invention controls the flow velocity of the waste water and aerates through the aeration tube. The contact area of wastewater, under the decomposition of ultraviolet light and the catalysis of TiO2, greatly improves the decomposition efficiency of methyldiethanolamine in wastewater, and can be produced continuously; secondly, due to the isolation of the filter screen, the ceramic ball will not be lost, which is highly efficient and energy-saving; After adding other chemical agents, no precipitation was formed after treatment.
