RU1836298C - Method of sewage treatment - Google Patents

Abstract

The invention relates to the field of industrial wastewater treatment. The method includes introducing a suspension of magnetite-based sorbent into water and passing it through a magnetic filter with loading from permanently magnetized elements. After reaching the maximum load capacity of the filter, the pH of the suspension in the filter volume is increased to 11.3 ... 11.5 and the suspension is treated with air for 15 ... 20 minutes. Then wash with water to neutralize the suspension in the filter volume and regenerate the filter with a water-air mixture. 1 tab.

Description

The invention relates to the field of industrial wastewater treatment and can be used in the engineering, radio engineering and metallurgical industries.

The purpose of the invention is to increase the density of the precipitate formed.

This goal is achieved in that in a method comprising introducing a suspension of a magnetite-based sorbent into wastewater and passing it through a filter with loading from permanently magnetized elements, which are periodically regenerated by reverse water-air washing, after reaching the filter's maximum oil capacity before regeneration, pH suspensions in the filter volume are increased to 11.3 ... 11.5 and the suspension is treated with air for 10 ... 15 minutes, after which they are washed with water until the suspension is neutralized in the filter volume.

As a result of air treatment, at pH-11.3 ... 11.5, of the suspension deposited in the magnetic filter, a decrease in the volume of sediment occurs during 10 ... 15 minutes, associated with the ordering of the structure in a magnetic field and a decrease in the amount adsorbed-bonded water. This allows increasing loads on the sludge dewatering apparatus and reducing its residual moisture.

The method is carried out as follows.

A sorbent based on ve magnetite is introduced into the wastewater. After 15 ... 20 minutes of contact in the reaction chamber, the treated water is passed through a filter with a continuously magnetized charge from crushed cermet material until the filter reaches its maximum load capacity. After that, by adding an alkaline solution, the pH of the suspension in the filter volume is new.

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melt to 11.3.,. 11.5 and treat the suspension with air for 10 ... 15 minutes. The filter is then washed until the suspension is neutralized and the charge is regenerated with a water-air mixture. The washing water is fed to a filter press to dewater the sludge.

PRI me R 1. Wastewater (water containing 30 mg / l of copper, zinc and chromium (VI) ions is treated with a suspension of sorbent-magnetite with a dose of 100 g / m3 on dry matter and pass it through a filter column with a diameter of 100 mm The pre-magnetized particles of ferrobarite with a size of 3 ... 5 mm serve as a filtering load.

After increasing the pressure loss on the filter by 1 m (load limit), the water supply for treatment is stopped. With a 5% sodium hydroxide solution, the pH of the medium in the filter is adjusted to 11.3 and air is supplied through a distribution system located at the bottom of the filter. After 10 minutes, the air supply is stopped and clean water is passed through the filter until the medium in the filter is neutralized. After that, by applying a bottom-up air-water mixture, the filter is regenerated. The apparent volume of sediment after 20 minutes of settling the wash water is 32% of the total volume of the liquid phase,

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Example 2 Example 1 is repeated, treating the suspension with air for 15 minutes at a pH of 11.5. The apparent volume of sediment after 20 minutes of settling the wash water is 28% of the total volume of the liquid phase. The apparent volume of sediment after 20 minutes of settling the wash water after regeneration of the filter without preliminary treatment (according to the prototype) is 43% of the total volume of the liquid phase.

Claims (1)

The claims A method for treating wastewater containing heavy metals, comprising introducing a suspension of a magnetite-based sorbent into wastewater and passing it through a filter with loading from permanently magnetized elements, which is periodically regenerated by reverse air-water washing, characterized in that, in order to increase the density of the resulting sediment, transmission is carried out until the filter reaches its maximum load capacity, before regeneration of the pH of the suspension in the filter volume 5. raise to 11.3-11.5, the suspension is treated with air for 10-15 mi and washed with water until neutralization of the slurry in the filter screen. 5 0