SU1011547A1 - Electrocoagulation apparatus for purifying effluents from hydrolysis and yeast production - Google Patents

Abstract

ELECTRIC OVERVIEW metal, electrodes, the contact characteristic of the contact being O, O1 O, 2 of the working surface of the electrode. 2. The electro-coagula of the mountains according to p. I, is characterized by the fact that the electrodes are made of aluminum or its alloy, (. And the contact plates are made of nickel or (L of its alloy.

Description

SP

four

Table

Chromaticity, PKSh2050397 391 COD, mKb / l585215209 VPK mgO / l15,310.2 9.6

Given in Table. 1, the data shows that with an increase in the surface contact of an aluminum anode with a metal having a potential, the working voltage in the electrocoagulator decreases with, and the maximum reduction of the wafer is given when the ratios of the surface of the contact plates to the working surface of the inode are .O, O1-O, one.

From tab. 2 it follows that an increase in the contact area above 0.2 is impractical, since it does not lead to an improvement in wastewater treatment.

Table 2

Thus, the presented data (Tables 1 and 2), which characterize the operating voltage in the electrocoagulator and the sewage treatment in the hydrodynamic zone from the anode to the nickel plate contact surface, indicate the optimum ratio of the surfaces of the contact plates to the anode working surface, 0, О1 -0,2 ,.

The consumption of electricity for the treatment of wastewater in the known coagulator (prototype) is 16-23 kW "h / m or aluminum consumption 80-100 g / m and 388403 432 405 211218 232 223 9.7 U.Z: 11.3 11 , 1 The invention relates to devices designed for sewage treatment of hydropower production using coagulants obtained by electrochemical dissolution of the anode material. It is known the use of devices that collector plate electrodes connected to an alternating current source Ij. The closest to the invention to the technical essence and the achieved result is an electrocoagulator comprising a housing with anodic and cathodic blocks placed in it assembled in packages of aluminum electrodes. The working surface of the anodes and cathodes and their shape is taken to be identical, which allows for overshooting ( changing the polarity of the blocks, ensure uniform solution of the electrodes, depolarization and cleaning of their surface. The interelectrode distance is taken to be equal to 20.0 mm t2} .. A disadvantage of the known device is that it operates at a comparatively high energy cost of the cleaning process. The purpose of the invention is to reduce the cost of electrical energy for wastewater treatment. The goal is achieved by the fact that in an electrocoagulator containing a bridge with electrode blocks placed in it, a block of soluble anodes of the electrocoagulator is connected by metal (alloy) contact plates with a more positive electrode potential compared to the potential of the soluble electrode. the surface of the contact plates is taken equal to 0.01-0.2 from the working surface of the anodes. The material of the electrodes is aluminum or its alloy, and the material of the contact plate is nickel or its alloy. Mixed stationary potential: the anode 1 without current load towards positive values corresponding to the dissolution zone (pereassivacin), allows to increase the rate of electrochemical dissolution of the anode material during operation of the electrocoagulator. The anodic current density (the rate of coagulant production) at the same operating voltage in the proposed electric: coagulant increases compared with the known, therefore, the cost of electricity for wastewater treatment. In the drawing, a schematic of the proposed electrocoagulant. The electrocoagulator includes a tank 1 with anodic 2 it cathode 3 blocks placed in it. BLOCKS of different polarity have the same type of construction and work alternately in the anodic and cathodic regimes. The electrical connection of the electrodes 4 in each of the blocks is ejected using contact plates 5 (Made of metal with a more positive apektrodnom potential compared to the potential of the material of the used electrodes. After assembling and shaking electrodes and contact plates on Pin 1, the electrical contact is made The surface in contact with the metal with the anodes is equal to o, O1-0.2 from the working surface, sufficient to mix the stationary potential of the anode (without current load) into the range potentials corresponding to the dissolution potentials of the anode. Places of possible penetration of the electrolytic contact surface can be insulated with a chemically resistant sealant (varnish). The efficiency of the electrocoagulant is checked during the treatment of wastewater from hydrolysis-yeast production (the sewage of the ODS) after biological treatment. and to the electrode electrodes. The anodic block is assembled from five electrodes from an aluminum alloy AMG-5 with nickel-contact plates on a nickel strip with a diameter of 5.0 mm . The working surface of the anode plate is 2O, 0. Obshe the working surface of the anodes in the block 1OO see The diameter of the contacting nickel plate, (washers) is 12.0 mm, the contact surface is about 1, O cm, which is 0, 1 from the surface of the anode. The anode current density is 40 mA / cm -, the treatment time of the solution is U min. The cathode block, of similar design, has six electrodes with a working surface of the plates of the cathode block of the SO, see. The distance between the electrodes is 5.0 mm. . Experimental data confirms the appropriateness of using an anode containing contact plates made of metal with a positive electr, native potential compared with the potential of a soluble anode, with the contact surface O, O1-O, 2 from; the working surface of the anode are presented in table. i to 2,

$ 10,11547 "

The cost of cleaning up the children is more than 4.8-6.5 kW-

0.5 5 rubles / m. The consumption of aptroenergy on the consumption of aluminum 38-45 g / m and the normal discharge of waste water from the DSP in the estimated tirovichoy cost of cleaning I m of the stoagulant with an optimal density of 0.32 rub.

anode current of 3.0-5.0 mA / cm composition-4O% lower in comparison with the prototype.

Claims (2)

ELECTROCOAGULATOR FOR WASTE WATER TREATMENT IN HYDROLYSIDE YEAST PRODUCTION, comprising a housing with metal electrode blocks placed in it, characterized in that, in order to reduce cleaning energy consumption, the electrodes are connected into blocks by means of metal and metal contact plates with a more positive electrode potential compared to electrodes, and the contact surface is O, O ΙΟ, 2 of the working surface of the electrode. 2. Electrocoagulator according to π. 1, about kicking in that the electrodes are made of aluminum or its alloy,. and contact plates are made of nickel or its alloy. Table! LU ...,,. —....... - Density Operating voltage of the electrocoagulator, V anode, to-Lj _____________________; _______________, - ............................ - ka, mA / cm Ratio 0 0.005 0.01 0.05 0.10 0.15 0j20 0.25 0.30 2.11 2.08 2.06 1.92 1.88 1.86 1.84 . 1.82 1.79 1.76 3.16 2,50 2.48 2.27 2.20 2.16 2.14 2.12 2.10 2.10 5.20 2.97 2.94 2.78 2.73 2.70 2.67. 2.64 2.63 2.60 7.15 3.22 3.20 2.98 2.96 2.93 2.90 2.88 2.86 2.83 Table 2 Indicators Before electrochemical treatment After electrochemical treatment in an electrocoagulator with different contact plate surfaces (from the surface of the anode) 0.01 0.1 0.2 0.25 0.30 0 Color, PKSh 2050 Q 397 391 388 403 432 405 COD, mgO ^ / l 585 215 209 211 218 232 223 BOD ^. , mgO ^ / l 15.3 10,2 9.6 9.7 10.3 11.3 11.1 Given in the table. 1, the data * show that with an increase in the contact surface of the aluminum anode with a metal having a positive potential, the working voltage in the electrocoagulator decreases by ⁵⁰ s ^ and the maximum decrease is observed when the contact plate surface to the anode working surface ratios equal to .0.01-0, 1. From the table. 2 it follows that an increase of 55 contact area over 0.2 is impractical, since this does not lead to an improvement in wastewater treatment. Thus, the presented data (Tables I and 2) characterizing the operating voltage in the electrocoagulator 'and the degree of wastewater treatment of the hydraulic pump depending on the contact surface of the anode with the nickel plate indicate the optimal ratio of the surfaces of the contact plates to the working surface of the anodes, equal to 0 , 01-0.2 .. The energy consumption for wastewater treatment in the known coagulator (prototype) is 16-23 kW · h / m with an aluminum consumption of 80-100 g / m ³ and 1 1011547 /