SU381613A1 - METHOD OF WASTEWATER TREATMENT - Google Patents

Description

one

This invention relates to wastewater treatment technology.

A known method of wastewater treatment by the combined method, combining chemical and electrochemical treatment. The chemical treatment is carried out by alkalizing by adding alkali to the wastewater, which is treated in electrolysis. However, this method allows cleaning only from one impurity - cyan ions.

For deep purification from impurities of heavy metals, organic substances and chlorine ions, it is proposed to conduct electrochemical treatment in the anode space of a two or multi chamber electrolyzer with anodes of lead dioxide or anode at a current density of 2.5 to 15 aldM and alkalinization to pH 8.5 -9.5 waste water that has undergone additional electrochemical treatment in the cathode space of the electrolyzer.

Alkali is formed in the cathode chamber, which is used for alkalisation in the first stage of the process.

Example 1. Waste water with different content of impurities is purified by neutralization and electrolysis at a current density of 2.5 aldM.

Electrolysis conditions:

Anodna density 2.5 ajdMtok

8.8 s

Voltage 68 ° C

Electrolyte temperature

Anode

lead dioxide

Stainless cathode; steel

Chlorine diaphragm fabric

The results of the experiments are presented in table. one.

15

20

25

The chlorine current output is 35%, the power consumption is 17 kWh / kg Cb. The degree of chlorine extraction (in the form of sodium hypochlorite) is 75--80%.

Example 2. Waste water with different content of impurities is subjected to purification by neutralization and electrolysis at a current density of 15 a / dm.

Electrolysis conditions:

Anodna density 15 a / dm

12 to 70 ° C

lead lead stainless steel chlorinated fabric

are presented in table 2.

table 2

The chlorine current output is 27%, the power consumption at 94% chlorine extraction is 37 kWh / kg Cb, while at 78% chlorine extraction, 24 kWh / kg Clg.

Subject invention

The wastewater treatment method is a combination method, combining chemical treatment by alkalization and electrochemical treatment, characterized in that

In order to provide the possibility of deep purification from impurities of heavy metals, organic substances and chlorine ions, electrochemical treatment is carried out in the anode space of a two- or multi-chamber electrolyzer with anodes of graphite or lead dioxide at an anode current density of 2.5-15 a / dm alkalization is carried out to a pH value of 8.5-9.5 with wastewater that has undergone additional electrochemical treatment in the cathode space of the electrolyzer.