SU1214603A1 - Method of removing phosphosulfurorganic compounds from sewage - Google Patents

Description

one

The invention relates to spos: Obam of wastewater treatment in the production of HSPP, in particular the treatment of wastewater from organic phosphorus impurities in the production of etaphos and heterophose (5-propyl-0- (2,4-dichlorophenyl) -0-ethylthiophosphate and S-propyl -O-phenyl-O ethylthiophosphate).

The purpose of the invention is to simplify the process and increase the degree of purification by treating wastewater with Fe (III) salts.

The essence of the method is that wastewater is treated with iron (III) salts at an atomic ratio of 0.55-0.7, at a pH of 2.5-3.0.

The organophosphorus compounds of wastewater from the production of heterophos and etaphos include the following compounds: 0-ethyl thiophosphoric acid disodium salt, 0-ethyl-O-phenylthiophosphoric acid sodium salt and 0-ethyl-0-2,4-dichlorophenylthiophosphoric sodium salt acid. The content of FOS in terms of phosphorus is 0.6–1.2%. Phosphorus is determined photometrically after mineralization by FOS hypochlorite in the form of yellow phosphorus Heterophos

Sodium Chloride 7.4

FeClj

(42.9%

)

13.4

0.56

.four,/

4.79

, 7

U6032

above-molybdenum complex. FOS is removed in the form of poorly soluble iron (III) salts of thiophosphoric acids.

5 Example. Wastewater in the amount of 100 kg is treated with 42.9% FeClj solution in the amount of 4.79 kg, which corresponds to a ratio of 7. Baseline pH

0 is equal to 1.0-1.2. The process is carried out at t 20 ° C.

To the resulting pulp with stirring, add 42% sodium hydroxide solution in the amount of 0.9 kg to

15 to reach pH 3.0 and continue to mix for 3-5 minutes. The precipitate is not soluble in water. The precipitate contains,%: Fe-FOS 60,79; sodium chloride 15.82; sodium bromide 23,39.

20 The precipitate is filtered from wastewater. Purification of FOS is 80.5% phosphorus.

The methodical part of examples 2-22 of the method are similar.

25 example 1.

Table 1 shows the results of wastewater treatment of etaphos and heterophos from FOS with iron salts in the optimal conditions found.

Table 1

0.90

53500 9041 83.1

pH 3

y

th

e

wasp

y

Rest

9.0

12.0

0.41

1.5

Rest

FeClj

(42.9%

rr

2.80

55

7.1

Fecli

(42.9%

rr)

13.2

0.56 5.0 Else

8.9

12.1

0.54

4.09

, 59

FeCls (42.9% -HbrfJ

rr) 3,94

, 6

Continuation of table

0.74

15600 2340 85.0

pH 3

0.92

53500 8399 84.3

pH 2.5

0.29

21600 3477 83.9

pH 2.5

IPS Water

CB from example 1

1.7 Else

CB from example 2

CB from example 3

CB from example 4

Fe (N03) 3-9HgO 0.9 3.69. pH 3, 7

Re (NO3) s 9H, .0 0.74 3.15 pH 3.0, 6

Fe (SOOi-9H O 0.92 5.58 pH 2.5, 55

Fe, (SO,) 0,29 6,29 pH 2.5, 68

3a less COD, attributable to volatile components.

The effect of changing the optimal conditions on wastewater treatment is the Continuation Table.

53500 9095 83.0

15600 2496 84.0

53500 8827 83.5

21600 3240 85.0

phosphorus and heterophos from FOS or iron m are given in table 2.

CB from examples

From the data of Table 2 it can be seen that an excess of Fe does not improve the purification, and unreacted iron salt remains in the filtrate, the lack of Fe salt worsens the purification. Besides.

Compiled by D.Gorbenko-Germanov Editor N.Kishtulinets Tekhred Z.Kastelevich Proofreader A.Zimokos

 Order 846/31 Circulation 865 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, 4 Project St.

table 2

cleaning deteriorates

if at

the optimal ratio of Fe: P 0.55 - 0.7 separating the precipitate is carried out at pH 3 or OH 2.5,

Claims (1)

METHOD FOR WASTE WATER PURIFICATION FROM PHOSPHORO-ORGANIC COMPOUNDS by precipitating them with the use of iron salts, which is important in that, in order to simplify the process and increase the degree of purification, the process is carried out by treating the source water with an iron (III) salt when the atomic ratio of Fe ^{3 +} / P _o ^. 0.55-0.7 at pH 2.5-3.0.