CS263959B1 - A method of pretreating neutral waste water containing lecithins, cephalins and egg albumin - Google Patents

Abstract

The pre-treatment method concerns neutral waste water containing lecithins, cephalins and egg albumin. To waste water with pH 5 to 9, sodium ions intercrystalline swollen montmorillonite with an average size smaller than 250 μm is added, preferably in the form of a suspension, in an amount of 0.2 to 3 kg. m-3, preferably 0.5 to 1.5 kg. m-3. After 10 to 60 minutes of mixing, preferably 20 to 40 minutes, the resulting sludge is removed by sedimentation or flotation. In hydroseparation by pressure flotation or electroflotation, an anionic organic flocculant must be used. Higher treatment effects are achieved if, in addition to sodium ions intercrystalline swollen montmorillonite, calcium sulfate is added in an amount of 1 to 4 kg. m-3, preferably 2 to 3 kg. m~3.

Description

The invention relates to a pretreatment of neutral wastewater containing lecithins, cephalins and egg albumin.

Hitherto known methods of pretreatment of egg water wastewater utilize coagulation with iron salts. Coagulation effectively removes undissolved substances, but other organic substances (eg egg albumin, lecithins and cephalins) are insufficiently separated from water. The efficiency ranges from 50 to 70 ° / o. Another disadvantage is that iron salts are added to approximately neutral water and their hydrolysis causes a drop in pH, which must be brought back to neutral by the neutralizing agents.

The essence of the proposed solution is to use sodium ions of intercrystalline swollen montmorillonite, which effectively absorbs phospholipids and egg albumin. If the treated wastewater has a roughly neutral pH, no neutralizing agent is required. 0.2 to 3 kg is added to the waste water at a pH of about 5-9. m ^"3 sodium ions intracrystalline swollen montmorillonite, preferably in slurry form. For most of these effluents, an addition of 0.5 to 1.5 kg is sufficient. m ^-3 .

Montmorillonite intercrystalline swelling with sodium ions is available on the domestic market under the name Sabenil (eg Sabenil 450, 550, 650). Effective sorption of egg albumin, lecithins and cephalins requires that the size of the modified montmorillonite be less than 250 μηο. After addition of the reagent, the waste water is mixed with the sorbent for 10 to 60 minutes, preferably 20 to 40 minutes.

Higher cleaning effects are achieved when calcium sulphate is added to the wastewater after the addition of the sorbent in an amount of 1 to kg. . m ^-3 , preferably 2 to 3 kg. m ^-3 . The resulting sludge is removed by sedimentation or flotation. The addition of anionic organic flocculants increases the hydroseparation efficiency, and in the case of flotation or electroflotation, addition is necessary.

The advantage of this procedure is a substantial simplification of the operation of the treatment plant, a higher cleaning effect and not increasing the salinity of the purified water.

The method for pretreating neutral wastewater containing lecithins, cephalins and egg albumin is further described in two exemplary embodiments.

Example 1

Waste water with BODs 2 010 mg. I- ¹⁰² contained 15.8 mg. Even organic P ^-1 and 170.9 mg. I ^{-1 of} organic N. 0.6 g was added to the waste water as a slurry. I ^{-1 of} sodium intercrystalline swollen montmorillonite (Sabenlu 450). After stirring for 20 minutes and separating the resulting sludge, the purified water contained 3.5 milligrams. I "organic P ¹ and 68.3 mg. Even ^-1 N. The organic BSKS value was 750 mg. I ^-1 O2. If, after the addition of the modified montmorillonite was added to the waste water, calcium sulphate (CaSO4. Ϋ2 HZO) in an amount of 2 g. Of ^-1, the offset after the sludge content of organic P 2.5 mg. I ^"1, organic N 26.8 mg. I ^-1 and the residual BODs value was 510 mg. I “ ¹ O2.

Example 2

For waste water containing 7.2 mg.l ^{-1 of} organic P, 256 mg. 1 ^_1 organic N, the total BSKS 2565 mg. I ^"1 O2 added 1 g. I ^"1 sodium ions intracrystalline swollen montmorillonite as a slurry. After stirring for 20 minutes and sludging off, the residual organic P content was 0.65 milligrams. I ^-1 , organic N 44.7 mg. I ^-1 and the total BODs was 550 mg. I “ ¹ O2.

Claims (1)

SUBJECT A process for pretreating neutral effluents containing lecithins, cephalins and egg albumin using sodium ions of intercrystalline swollen montmorillonite, characterized in that sodium ions of intercrystalline swollen montmorillonite of less than 250 microns in size are added to the waste water at pH 5-9. in the form of a suspension in an amount of 0.2 to 3 kg. m ^-3 , preferably 0.5 to 1.5 kg. m ^-3 , calcium sulfate in an amount of 1 to 4 kg is optionally added to the waste water to increase the cleaning efficiency. m ³ , preferably 2 to 3 kg. m ^-3 and after stirring for 10-60 minutes, preferably 20-40 minutes, the sludge formed is removed.