CS252050B1 - Method of waste waters' biological purifying from accelerators made in rubber plants - Google Patents

Description

The present invention relates to a process for the biological treatment of wastewater from the manufacture of rubber accelerators comprising, in particular, chlorobenzene, acetone, isopropanol, butanol, morpholine, aniline, benzothiazole, 2,2 ' -dithiobiobenzothiazole and 2-mercaptobenzothiazole.

The organic substances contained in the wastewater from the manufacture of rubber accelerators are foreign in nature and cause serious ecological problems. There are known procedures for removing some of these chemical individuals individually. It is also known that, for example, acetone, isopropanol, butanol, and in part aniline, can be biodegraded. On the other hand, benztlazole, morpholine and 2,2'-dithio-bi-benzothiazole and 2-mercaptobenzothiazole are reported to be biologically difficult or even non-degradable (Meincke F. et al., Industrie - Abwásser, Stutgart 1968, Wotzka J , et al., Wasserschadstoff - Catalog, Wasserwirtschaft Institute, Berlin, 1975 and supplements).

It has now been found that waste waters from the manufacture of rubber accelerators containing, in particular, chlorobenzene, acetone, isopropanol, butanol, morpholine, aniline, benzothiazole, 2,2'-dithio-bi-benzothiazole and 2-mercaptobenzothiazole, can be purified biologically by the method according to the invention.

The principle of the invention consists in that the waste water is subjected to biological treatment after activation, optionally pre-treatment by coagulation, by activation and optionally by sorption. The biological purification is preferably carried out with an inert porous mass biomass carrier embedded in the activation environment.

The process for treating wastewater from the rubber accelerators according to the invention preferably takes place after the activated sludge has been adapted for at least two weeks. By introducing the biomass carrier into the activation environment, a base material is created for the growth of special types of microorganisms, which ensures their retention and concentration and thus the operational advantage of the whole process, which results in higher operational stability, lower demands on wastewater homogenization and temperature reduction) . The following examples illustrate, but do not limit, the method of purification of wastewater from the manufacture of rubber accelerators according to the invention.

Example 1

Waste water containing chlorobenzene, acetone, isopropanol, butanol, morpholine, benzothiazole, Pneumax DM and Pneumax MBT was purified. After homogenization, the waste water was subjected to biological treatment by activation operated at the following technological parameters:

residence time 24 hours sludge concentration 5 g. 11 ^_ sludge load (COD) 0.2 kg. kg ¹ . d ^_1 sludge recirculation 100%

Activation of the activated sludge took place for 1 month. The biological purification efficiency in the COD indicator was 85%.

Example 2

Wastewater of the same composition as in Example 1 was treated. After homogenization, the wastewater was subjected to biological treatment by activation taking place with a biomass carrier made of ceramic with a maximum surface area at the following technological parameters:

residence time 24 hours sludge concentration 5 g. 11 ^_ sludge load (COD) 0.2 kg. kg ^-1 . d ^_1 sludge recirculation 100%

The activated sludge was adapted for 2 weeks. The biological purification efficiency in the COD indicator was above 90%.

Compared to the previous example, higher stability of operation, faster adaptation time of activated sludge, lower temperature dependence of the process were observed.

Claims (1)

Process for the biological treatment of wastewater from the manufacture of rubber accelerators containing, in particular, chlorobenzene, acetone, butanol, morpholine, aniline, benzothiazole, 2,2'-dithio-bi-benzothiazole and 2-mercaptobenzothiazole, characterized in that the waste water is homogenized and possibly Pre-purification of the coagulase is subjected to biological purification by activation and optionally purification by sorption, wherein the biological purification by activation is preferably carried out with a biomass carrier of an inert porous mass introduced into the activation environment.