SU715506A1 - Method of sulfate-cellulose production waste water purification - Google Patents

Description

(54) METHOD OF CLEANING CTO4f {bIX WATER SULFATE-CELLULUS PRODUCTION

Acid BEFORE pH 4.5-5.5 and then electrocoagulation is carried out until pH 6.5-7.5 is reached. It is preferable to conduct the process at current density O, OOZ 0, OO4 A / civi

Conducting sulfuric acid to pH 4.5-5.5 allows subsequent electro-coagul spi to be carried out in a shorter period (5-10 min) and obtain a pH of purified water that meets the requirements for discharging water into water to 1 pH value ( 6.5-7.5), while achieving the Purification effect, the lid of the chromaticity is 97.5- 99%.

715506

Acidification of the source effluent to pH4.0 and below increases the acid consumption and gives the pH after electrocoagulation, which does not meet the water discharge norms for pH values (6.0). Acidification of the effluent with sulfuric acid to pH 6.0 and above results in a decrease in the purification effect due to c) and purified water also does not comply with the pH value (8.0) of the discharge standards.

The results of purification of sulphate effluent, confirming the expediency of the process in the specified pH range, are presented in Table 1.

Table

Example. The method is carried out in a single apparatus with continuous sampling which forms from the sludge from the water surface. .., Wastewater in the amount of 40O ml with pH 8 acidified by addition of 22, 5 meq / l. to a pH of 4.5-5.5, and pass an electric current density

eight

Claims (2)

5.4 4.8 4.45 OOOZ A / cm, using an aluminum anode, for 6 minutes until pH 6.5-7.5. In the process of processing the water is mechanically mixed. Five minutes after the end of the electrocoagulation process, the analysis of purified water is carried out according to the following parameters: pH, chromaticity, residual aluminium content. The data obtained are given in table. 2. Table From the obtained data sledbt. The proposed method allows purifying sulphate effluent with a high initial pH value (8.0) with lower electric power consumption, while achieving a significant purification effect of 99%) and simultaneously neutralizing the effluent, ensuring direct discharge of purified water into the pond. Invention 1. Method The sulphate-cellulose production wastewater is electrocoagulated with a soluble aluminum anode, characterized in that, in order to increase the degree. reducing the time spent on npoflec7 6 sa and reducing the c6during of the exact amount of aluminum in the water, the wastewater is pre-acidified with sulfuric acid to a pH of 4.5-5.5, and then electrocoagulated until the pH reaches 6.5-7.5. 2. The method according to claim 1, 1 and 2 with the fact that electrocoagulation is carried out at a current density of 0, OOZ0, 004 A / cm. Sources of information taken into account during the examination 1. USSR author's certificate . No. 36462, Cl, C 02 C 5/12, dated 09.O3.71. 2.Sb. Ref. inform Pulp, paper, cardboard 1973, No. 23, p. 11 (prototype).