SU302315A1 - METHOD FOR CLEANING WASTE WATER OF PRODUCTIONS OF SUSPENSION POLYSTYROLS - Google Patents

Description

A known method of purification of wastewater production of suspension polystyrenes by treating wastewater with magnesium chloride in an alkaline environment. However, this method is not effective enough.

The proposed method is characterized in that sodium styrene copolymer with maleic anhydride or sodium salt of methyl methacrylate with methacrylic acid (AiMA) is used as a coagulant or methacrylic acid (AiMA) copolymer sodium salt, preferably at a pH of 1.5. This allows a higher degree of purification.

The coagulants used are introduced in the form of aqueous solutions (250-500 g / l in the amount of dry product). The water is acidified to 5, the colloidal system is destroyed, after which flocculant is added to polyacrylamide (0.1% aqueous solution).

The separated polymer, which constitutes 0.5-2.5% of the volume of the effluent, is filtered from the clarified water and sent for recycling.

Example 1. To 1000 ml of local production flow of impact-resistant styrene copolymer with acrylonitrile brand SNP-SP was added sodium styromal solution (600 mg, calculated on the dry product). After thorough mixing, the stock is acidified.

2.3 g of sulfuric acid (up to .5) and 40 ml of a 0.1% nnacrylamide solution are added. The recovered polmer is filtered from clarified water through a caprone filter into a shed. Characteristics of purified water are presented in table. 1, sediment - in the table. 2

Example 2. To a 1000 ml of joint stockproduction of polystyrenes of grades PS-S, PS-SU, SP n PSB, add a colloidal solution of styromal (200 mg in weight per dry product). The C: mixture was thoroughly mixed and acidified with 0.65 g of sulfuric acid (up to, 5) and 40 ml of polyacrylamnd was added. The separated polymer is filtered off through a base filter. The characteristic of purified WATER is provided in table. 1, sediment - in the table. 2

Example 3. To 100 ml of local sewage production of polystyrene grade PSB, 500 mg of styromal colloidal solution is added. The mixture is stirred and acidified with 1 g of sulfuric acid (up to, 5). The separated polymer is filtered off through a base nylon filter. Characteristics of purified water are presented in table. 1, Ospd1: a - in table. 2

a 5% aqueous solution of MM K copolymer sodium salt (200 mg in terms of the cyxofi product. After the thp11100 alternate ;; and | c :;: and acidified with acid, (10 pll: s:, 5) and add 40 ml of a 0.1% diluted aqueous solution of polpakr11lam11da. EXTR111 and 11 1s polymer was isolated ;; t from lightening ;; (lucTi.i: srzsbzevy or kapropovyi fpl1 / G)). The characteristic of ochlschepny water is presented. :: s ;; and in tab. 1, sediment - in the table. 2

11 p and c p. 5. To iOOO ml of coBMecTtioro effluent from production of grades PS-S, G1S - (; Y, SI and PBS add water) to the solution of salt MMlv copolymer (200. Mg in the range cv.xoii product ). After the thoracic cortisol disease, 1..3 g of acid sulphate is produced (until RP, 5)

.X a rac t t-p II with t i ka o h i: u ss n y s t o h n y. X v o d

The characteristics of the purified water presented in the table. 1, sediment - in the table. 2

Example 6. To 1000 ml of local drain of production of golistprol PSB brand added kgg 200 mg of 5% -iioro solution of sodium salt of MMK soiolimer. The mixture is stirred and acidified with 1.5 g of sulfuric K1 slot1 (to) nss; l, 5). A further procedure is carried out similarly as in Example 5.

The characteristic of purified water is presented in table. 1, in the table. 2

Example 7. To 1000 ml of a joint runoff of the production of copolymers of the brands LPT, MS, change MMK, add 500 mg of a 5% solution of sodium salt of the MMK sonolymer. The mixture is unmixed with 1.3 g / l of sulfuric acid (to pnss: 1, 5). Further methodology and experience is similar to that shown in example 4.

The characteristics of the purified water are presented in Table 1. 1, sediment - in the table. 2

Table 1

Table 2

Sludge Characteristic

Subject invention

The wastewater treatment method is used to produce susceptible iolithyrols by treating wastewater with a coagulum agent, which, in order to increase the degree of purification, use sodium salt of styrene copolymer with maleic anhydride or sodium or sodium salt / sample / sample / copolymer sodium methane gauge or sodium methane gauge. and the process is carried out in an acidic medium, preferably NRI, 5.