Novel biochemical treatment method for removing heavy metals in sewage by strengthening composite carrier

Abstract

The invention discloses a novel composite carrier enhanced biochemical treatment method for removing heavy metals in sewage, and belongs to the technical field of sewage treatment. The method comprises the following steps: firstly, mixing diatomite and tourmaline to obtain a composite carrier, then soaking the composite carrier in sewage raw water, and stirring the mixture for obtaining compositecarrier slurry after the composite carrier completely absorbs moisture; then, adjusting the pH value of the composite carrier slurry to 7-8 by adopting a pH regulator, and then adding the composite carrier slurry into an anaerobic tank in an AAO biological treatment device; and finally, starting the AAO biological treatment device, enabling the sewage to be treated to flow into the anaerobic tankand the composite carrier and the sewage to enter a subsequent AAO treatment unit together, operating the AAO process for a period of time to perform microbial culture on the composite carrier, and operating the AAO biological treatment device under a normal stable operation stage after the microbial culture of the composite carrier is finished. According to the method, the removal rate of COD andTN in the sewage can be increased while heavy metals in the sewage are intensively removed.

Description

technical field [0001] The invention relates to a biochemical treatment method for strengthening the removal of heavy metals in sewage by a novel composite carrier, belonging to the technical field of sewage treatment. Background technique [0002] With the rapid development of modern industry, the discharge of industrial wastewater has also increased sharply, the accumulation of heavy metals in water has intensified, and heavy metal pollution has become serious. On the other hand, enterprises that produce non-ferrous metals have wastewater discharges in the entire production process from mining, beneficiation, smelting to product processing, which contain heavy metal elements such as antimony, copper, lead, zinc, arsenic, chromium, electroplating, pigments, etc. , electronics, instrumentation and other industries will also cause serious heavy metal pollution. Heavy metal ions in heavy metal wastewater circulate through groundwater and migrate through soil, causing pollutio...

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Problems solved by technology

However, due to the high acidity of heavy metal wastewater, the complex types of heavy metal ions, and the existence of various valence states and forms, the treatment is extremely difficult. There are many problems in the treatment of heavy metal wastewater by using the existing AAO process, such as natural flocculation and sedimentation. long, the discharge water is difficult to meet the national discharge standards, etc.

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