SU1650612A1 - Method of processing phosphorus-bearing slimes and sewage - Google Patents

Abstract

The invention relates to methods for cleaning industrial waste and wastewater from white phosphorus and can be used in the chemical and metallurgical industries. The aim of the invention is to extract white phosphorus from sludge and to increase the degree of purification of phosphorus-containing wastewater. Phosphorus-containing sludge (0.5-5.0 wt.% Is subjected to y-irradiation in the dose range of 1.5-1.7 kGy at a temperature of 50-80 ° C under the conditions of oxygen-containing mixture sparging. The degree of phosphorus recovery was em 99.4-99.9% with a time between 3 and 3 hours. In the absence of irradiation, the system is not exfoliated for 12 hours. Phosphorus-containing wastewater (4-150 mg / l) is also y-irradiated in conditions of bubbling with an oxygen-containing mixture at a temperature of 30-70 ° C. The dose required to achieve a residual concentration of phosphorus in water mg / l, t 0.2–4.0 kGy. Treatment time is reduced from more than 20 hours (without irradiation) to values not exceeding 6 hours 2. Table 2. SP C

Description

The invention relates to methods for cleaning industrial waste and wastewater from white phosphorus and can be used in the chemical and metallurgical industries of the national economy.

The aim of the invention is to extract white phosphorus from sludge and to increase the degree of purification of phosphorus-containing wastewater.

In order to carry out the process, wastewater containing 0.5% -5% white phosphorus is treated with γ-radiation at elevated temperature and sparging oxygen-containing gas mixture.

Example. A 150 cm3 glass reactor equipped with a bubbler and thermostating jacket is charged with 100 cm3 of phosphorus sludge with a phosphorus content of 0.5–5.0% and subjected to γ-irradiation at 50–80 ° C, an absorbed dose rate of 0.2 Gy / with and the rate of bubbling air 10 ml / min. Under the action of radiation, the structure of the sludge is destroyed and white phosphorus is released, which is extracted using a siphon.

The results of radiation treatment of phosphorus sludge are given in table. I.

As follows from the data table. 1, the sludge separation process begins with an absorbed dose of 0.5 kGy. To exfoliate the sludge with a high degree of phosphorus extraction, the necessary irradiation is in the dose range of 1.5-1.7 kGy. When the dose is above 1.7 kGy, the recovery rate does not increase. In the absence of irradiation (control experience), delamination of the system is not observed, ceteris paribus, for more than 12 hours.

ABOUT

eaten about oh oh

Yu

Example 2. In a glass reactor with a capacity of 150 cm, equipped with a bubbler and thermostatic jacket, placed 100 cm3 of phosphorus-containing wastewater and subjected to irradiation at 30–70 ° C, an absorbed dose rate of 0.2 Gy / s and an air sparging rate of 10 ml / min .

The irradiation is continued until the residual concentration of white phosphorus is 1 mg5 l / l (mg / l). The resulting phosphoric acid is disposed of.

The results of the radiation treatment of phosphorus-containing wastewater to a concentration of white phosphorus below 10 mg / l are given in table. 2

In the absence of radiation at the initial concentration of phosphorus C mg / l and with other things being equal, according to a known method, the oxidation of phosphorus to MPC is not reached within 20 hours. As follows from the data in Table. 2, the treatment time under irradiation conditions does not exceed 6 hours. The dose required for the disposal of wastewater to a level of 10 mg / l depends on the initial phosphorus concentration and temperature. This dose is calculated using ratios (1) and (2) for initial concentrations of white phosphorus L -1 CO mg / L and less than 4 mg / L, respectively. Temperature range of applicability of equations 30 -70 ° C.

in С

R .

+ 1

0.8 t / 30 Р „(0.375 fV

WITH,

(one)

(2)

where C is the concentration of white phosphorus, mg / l, 35 t -1 temperature, a C and P - absorbed dose, kGy.

five

0

five

0

five

0

If the value of C is 150 mg / L in the initial system, then the emulsion is exfoliated, which makes it possible to further isolate white phosphorus. At C 4 mg / l, the effect of bubbling with an oxygen-containing gas mixture and a temperature change in the range of 15-100 ° C have little effect on the cleaning process.

Claims (1)

Claims A method for processing phosphorus-containing sludges and sewage, comprising sparging an oxygen-containing gas mixture at an elevated temperature of the original sludge, characterized in that, in order to extract white phosphorus from the sludge and increase the degree of purification of phosphorus-containing wastewater, sparging oxygen-containing gas mixture is carried out simultaneous y-irradiation in the range of absorbed doses of 0.5-1.7 kGy, followed by the separation of phosphorus after the separation of the sludge and the irradiation of the remaining aqueous phase in the dose range from According to the relation (1) for the initial phosphorus concentration of 4-150 mg / l and the ratio (2) for the initial concentration of less than 4 mg / l at a process temperature of 30-70 ° C. In С SG.8 +1/30 0.05 t R + 1 Р- (0.37520 ) WITH, (12) where C is the concentration of white phosphorus in the system, mg / l, t is temperature, ° С; P - absorbed dose, kGy. Table 1 table 2