SU1627521A1 - Process for purification and neutralization of slime-containing liquid - Google Patents

Abstract

The invention relates to chemical technology associated with electrochemical and electromembrane cleaning of a liquid from impurities of inorganic and organic origin, while simultaneously disinfecting it. The aim of the invention is to increase the degree of purification and disinfection. The silt-containing liquid previously prepared by machining is treated in the electrode chamber with an electric current of a density of 0.02-0.05 A / cm2 and at the same time a protonized solution is pumped into the electrode chamber through insoluble finely porous layers on perforated insoluble electrodes with a specific flow rate of 1.5 to 3.0 g - he tf per 1 m3 of silt-containing liquid. 1 dw., 6 tab. S (/

Description

The invention relates to chemical technology associated with electrochemical and electromembrane cleaning of liquid from inorganic and organic impurities with simultaneous disinfection, and can be used in all sectors of industry, municipal and agriculture in technological schemes for conditioning lake, river, brackish, sea and wastewater.

The purpose of the invention is to increase the degree of purification and disinfection.

The drawing shows an apparatus for carrying out the proposed method.

The apparatus has a housing 1, a choke 2 for the cleaned sludge-containing liquid, a choke nozzle 3 for the protonized solution, a choke 4 for the cleaned and decontaminated fluid, perforated insoluble electrodes 5 that form between the parallel planes an electrode chamber 6 that have microporous insoluble partitions on the side of the chambers 8 for a protonated solution, a flotation chamber 9 located above the electrode chamber, a scraper mechanism 10 installed in the upper part of the flotation cell and ending on border with chamber 11 for foam, sludge and particles of impurities, distribution 3116

a flow divider for purified and decontaminated fluid 12 located in the lower part of the flotation cell and connecting it with chamber 13 for

purified and disinfected liquid.

Example. Sewage water that has undergone incomplete biological treatment at the KU-200 unit, with an activated sludge content of 0.6 g / l is cleaned and disinfected by known and proposed methods on a model plant with a capacity of 08-0.15 m3 / h. The volume of the flotation cell of the installation is 40 liters, height 60 cm, current density in the interelectrode space 0.05 A / cm2 “The composition of the waste water and its parameters are presented in Table. one.

The data obtained as a result of experiments are given in table. 2

The upper limit of the electric current density (i) in the electrode chamber is estimated to be 0.05 A / cm2, the lower one is 0.02 A / cm2.

Abroad upper limit i

The height of the liquid-liquid layer between the liquid-air phases, the coefficient of cleaning and disinfection of the silt-containing liquid remain constant, and the energy consumption for the process increases dramatically. The results are shown in Table. 3

From the experimental data, it follows that with) ,;) 5 A / cmg of energy consumption, the proposed method and apparatus for its implementation become noncompetitive with respect to known methods and apparatus due to energy consumption.

Beyond the lower limit i, there is a sharp increase in the height of the ilogas-liquid layer in the flotation cell h and a decrease in the cleaning and disinfection ratio of the sludge containing liquid. Data is given in

tab. four .

The sharp increase in h and the decrease in pressure is explained by a decrease in the gas phase in the sludge-containing liquid passing through the electrode chamber.

The upper limit of the mass flow rate of the protonized solution is estimated as

. with g-ion H -. lower - 1,5 :.

j | 3

t. G-ION H

W, h) ---- MJ

Beyond the upper limit, the degree of purity is constant. However, with G 3,0

g-ion H

 mg

res.

g 5

0

five

Q

five

five

0

0

five

To (by one and a half order) the concentration of H ions in the flotation bath increases. Neutralization of the excess concentration of H ions requires significant amounts of alkaline reagent, which does not improve the characteristics of the method and the apparatus for its implementation, and with a flow rate of less than 1.5 g-ion H / m3, the required degree of purification is not achieved. The data are given in table. five.

The protonized solution is a solution of acidified deionized or softened water activated in a microporous medium in an external electric field when water is forced through microporous partitions superimposed on perforated insoluble electrodes.

The combination of microporous walls of the dielectric and perforated

The insoluble metal electrode is formed by a microporous metal-electric element (MMDE).

The properties of the protonized solution are determined by the treatment of acidified deionized water in an external electric field, as well as by the internal (osmotic) pressure of acidified deionized water, which exhibits its properties in a microporous medium when water is forced through MMDE into the sludge-containing liquid.

The significance of the sign of pushing a protonized solution through MMDE reveals the data in Table. 6

It follows from the above data that the use of a protonized solution can significantly increase the degree of purification.

Thus, the application of the proposed method allows a significant increase in the degree of purification and disinfection of sludge-containing liquid.

Claims (1)

Invention Formula The method of cleaning and disinfecting the silt-containing liquid, including its electrochemical treatment in a diaphragm-free electrolyzer with subsequent separation of the precipitate, characterized in that, in order to increase the degree of purification and disinfection, electrochemical treatment lead with the use of insoluble perforated electrodes, coated on the side opposite to the interelectrode space, with microporous partitions of insoluble material, when fed through partitions and electrodes of acidified deionized or softened water with a specific proton consumption of 1.5–3.0 g Hf ion per 1 m3 of silt-containing liquid and electrical treatment is carried out at a current density of 0.02–0.05 A / cm2. table 1 Options yu 15+; there is 5-10 3 fecal putrid I 20-60 More than 110,000 Wastewater that has undergone incomplete biological treatment at the KU-2EO facility (extract from the protocol 161-163 of the Krasnodar Regional Sanitary and Epidemiological Station) Table 2 15 + 2 Less than 2 Not thirty 1 ozone 0.5-1.4 Less than 3 (J l / h, ,, 1; Sim-0.6 ± 0.1 ,five; MIC ref. Them Adl leke ref. - 10 cells / l Sludge-containing waste water having undergone incomplete biological treatment at the KU-200 unit. GO 80 g / h, GH, 0.05 th, Sakg. Or 0.6 g / l, BOD. water "120 mg / l, if the water index l-1) -Y  l / h; , 02 A / cmg; , 2 ± 0.1,  - Ela - b + E, g / l; BOD5 ref. mg / l; Coley - index ref. water 1PCh-10 ° C / l Table3 Sludge-containing waste water that has undergone incomplete biological treatment at the unit KU-200, GO 80 l / h, 02 A / cm2, C „Ktida 0 6 g / l, VPK ,, water 12J mg / l, index of water) ° 1j G 0.05 Ezhil- And cm2 h. pH of purified and disinfected water The time during which the ilogas-liquid layer remains at the liquid-air interface does not settle into the volume of the flotation tank. 6.1) 6-12 Yu and 42    i-. ffl% yl SAL, “/“ / /; yt y l x o  t ° r 7 o " -L ° World Cup Mr.-H