Corrugated medium pulping wastewater treatment technology

Abstract

The invention discloses a corrugated medium pulping wastewater treatment technology. The technology comprises the following steps: silts are removed from pulping wastewater, the obtained water automatically flows to a wastewater treatment station; large-granule suspensions are removed through a mechanical grating, the obtained water is sent to a hexagonal screen for separating out short fibers in the wastewater, the obtained water enters a regulating reservoir, the obtained water enters a shallow-layer air floatation tank for further separation of fine suspensions from the wastewater, the obtained water is discharged to an SBR tank for aerobic biochemical treatment, a supernatant obtained after precipitation is discharged to a water draining pool through a water decanter, and overflow water is discharged outward. The technology is simple, and allows most SS in the wastewater to be removed by adopting a mechanical grating, hexagonal screen filtration, coagulation and air floatation precipitation treatment process, allows the discharged water to satisfy subsequent biochemical treatment requirements, and substantially reduces the medicine consumption.

Description

technical field [0001] The invention belongs to the treatment of wastewater in the field of pulping and papermaking industry, especially the treatment of wastewater with high concentration and high suspended matter containing various organic and inorganic compounds produced in the production process of high-strength corrugated base paper, and specifically a process for treating wastewater from pulping of corrugated base paper . Background technique [0002] Paper industry wastewater is one of the more difficult wastewater to treat, and the most difficult wastewater in paper industry wastewater is pulping wastewater. The waste water in the production process of high-strength corrugated base paper mainly comes from the processes of pulping, refining, screening, thickening and papermaking. The chemical composition contained in the pulp mill wastewater is relatively complex. In addition to the general sewage properties, it also contains other pollutants such as oil and high chr...

AI Technical Summary

Problems solved by technology

The chemical composition contained in pulp mill wastewater is relatively complex. In addition to the general sewage properties, it also contains other pollutants such as oil and high chroma, and the sewage has a high temperature and poor biodegradability, so it is discharged into the environment. It causes serious pollution to the environment, and the water recycling rate is low. It is one of the more difficult industrial wastewater to treat.

Although my country's environmental protection department has taken decisive measures to completely shut down the chemical pulping and paper mills with a capacity of less than 5,000 tons, which has alleviated the environmental pollution of corrugated pulping wastewater to a certain extent, fundamentally speaking, it is still necessary to choose a scientific and effective way to produce waste. liquid treatment method

Practice has proved that pure physical and chemical treatment or biochemical treatment is difficult to make pulping wastewater meet the discharge standards required by the state

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