Sverit Technologies

A key element of this (ISBS) process is a continuous generation the three-dimensional succession of the hydrobionts – ISBS (Integrated Spatial Bacterial Succession), wherein the optimum conditions of ambient environment in reactor’s bulk correspond to certain species of hydrobionts, and within bio-cluster TOP one relevant bacterial species is being replaced by another.

Due to bacterial activity which is supported under conditions of steady-state growth and depending on reaction rates, diffusion coefficient and also availability of nutrients for exoenzymes, spatial succession of purification processes is formed. Catabolism and assimilation of nutrients are carried out by means of combined participation of various microorganisms.

Optimal conditions for growth and co-existence of bacteria within the bounds of the «TOP» are realized thanks to following factors:

1. The rational ratio between effective surface of the Multilayer Inert Carrier and net volume of each bio-cluster TOP. If the type of inert carrier is chosen, this factor becomes a critical parameter to be considered. Under aerobic condition the texture of I.C. allows hold down up to 18 ÷20 g/l of fixed biomass. The M.I.C. is specifically designed to ensure accessibility of nutrients and oxygen to all fixed hydrobionts (anywhere on the biofilter).
2. At the same time the structure of Multilayer Inert Carrier operates like a built-in disperser of air bubbles injected from the air diffusers, disposed at the bottom of the «TOP».

Biofilm growth is limited by effective surface of the Multilayer Inert Carrier and by the rate of digestible nutrients, i.e. by accessibility of organic pollution and oxygen. In the bio-cluster TOP a relationship between “microbial food” and the number of bacterial cells is controlled in such a manner that essential part of nutrients are enough only for a maintenance energy but not for bacterial cell growth. Bacterial cells are kept in a state of starvation. In this state exponential cell growth and as a consequence sludge growth does not take place. Since the growth rate depends on the amount of “food” in the bio-cluster TOP, the number of cells does not increase (stationary growth phase). Due to the high density of biomass on the M.I.C. (up to 18÷20 g/l) the growth rate is also reduced, and most of organic and inorganic contaminants, as mentioned above, are used only for maintenance of the existing biofilm. Thus, in accordance with environment in-structure of each Three-D Original Package the bacterial cells are capable to self-regulation.

In the Package Advanced Treatment ISBS-Reactor complete biological digestion of pollution is carried out as a complex multistage process. Two forms of food chains should be differentiated in the Integrated Spatial Bacterial Succession (ISBS):

• Trophic redox (substrate) chain, and
• Predator-prey interactions

Nitrification and Denitrification (N/D – ammonia oxidation process and nitrate reduction process) are performed as a part of the ISBS-process.

N/D are performed using Three-D Original Packages with M.I.C., preliminary seeded by specific bacterial culture.

In case of fixed biomass ammonia oxidation reaction and nitrate reduction are effected by means of both external and internal diffusion. Nitrification occurs in the superficial film layers (well-aerated process) whereas in contrast, denitrification (anoxic process) takes place at only low oxygen concentrations in deeper biofilm strata. Necessary nutrients for denitrifying bacteria are diffused into deep layer of biofilm. In case of nutrients depletion by-product of substrate metabolism (metabolite) from superficial film layers can diffuse into deeper biofilm strata; these metabolites being additional sources of food for the denitrifying bacteria.

Nitrate reduction process is limited by substrate concentration (hydrocarbons and nitrates) in the ISBS-Bioreactor. Under these conditions in each purpose-designed «TOP» the cells density reaches the plateau which subsequently is being adjusted by dynamic balance between growth and decay of bacterial cells and also by cells spalling. Incoming BOD is ample for a maintenance energy, but is not enough for the bacterial cells growth.

  PROCESS FLOW DIAGRAM

  MAJOR ADVANTAGES OF THE PACKAGE ADVANCED TREATMENT ISBS-REACTOR  AND BUSINESS ACTIVITY        

1. «ISBS» technology is applicable for sewage with different concentration of contamination (domestic, industrial and agricultural sewage), and also for purification of small volumes, for example from 50 m³/day up to averages volumes (1000 m³/day) as well as big volumes (from 10,000 m³/day and above);
2. The yield of surplus activated sludge is 100÷300 times less compared to other existing technologies;
3. The additional systems for settling and recirculation of surplus activated sludge are not needed;
4. No treatment and utilization of surplus activated sludge required;
5. The residence time of wastewater treatment considerably shortens;
6. The systems for restoring initial properties of multilayer inert carrier and extra nutrition of bacteria are not needed;
7. Nitrification, Denitrification and Aerobic biomass stabilization are performed in the bio-cluster TOP, that eliminates supplemental wastewater treatment systems;
8. Foolproof and robust system;
9. Operational safety;
10. Full automated;
11. Resistant to dancing of effluents;
12. High process stability and reliability;
13. Functional simplicity & Longevity;
14. Absence of the odor.

Business Activities

• Installation and commissioning of Biological Wastewater Treatment Plants;
• Turn key projects;
• Pre-treatment, Post treatment – per requirements & customer demand;
• Upgrade existing WWTP;
• Services and support;
• Technical and operational support after installation;
• Operation as sub-contractors or independent;

    Municipal wastewater:

• Wastewater treatment system in building’s basement;
• Upgrading & restoring wastewater plants;

    Industrial wastewater:

•  Food & Beverage industries;
•  Dairy factories & farms;
•  Brewery & Oil factories;
•  Meat factories,Slaughterhouse & Poultry slaughterhouse;
•  Garbage and refuse landfill site;
•  Petroleum refinery & Gas processing plants, etc.