Biological water purification

In order to better implement biological water purification activities, Defensor – leading company in the field of sanification – collaborates with and supports the major companies in the applied biotechnologies sector which have worked in the sector for years.

Coordination and critical analysis of procedures for verification of work done, suitability of procedures adopted, synergy of companies involved in the project and research by the most important experimental institutes, have brought about the production of formulas based on enzymes and microorganisms for the treatment of organic soil and water substances.

REPORT ON THE TREATMENT OF CIVIL WASTE AND SEWAGE WATER WITH TECHNOLOGY AND RELATED TESTING

The treatment of civil waste and sewage water using our microbial and enzymatic compounds is the new frontier of environmental sanitisation and purification; it is now the best alternative to both the chemicals used until now and mechanical technologies.

Their action exploits the natural processes of fermentation of organic matter, accelerating and changing them favourably.

The formation of harmful substances such as AMMONIA, HYDROGEN, SULPHUR, INDOLE, SKATOLE and MERCAPTANS is thus reduced.

When it is normally decomposed by natural and uncontrolled fermentation processes, organic matter causes the formation of harmful, toxic and foul-smelling substances. On the other hand, if we intervene on the control and selection of enzymes and microorganisms capable of metabolising organic residues, neither harmful or toxic substances nor bad smells will be formed; these are ecologically important results for humans and the environment in which they live.

Compared with chemicals, they have considerable advantages. Every single chemical has an activity aimed at precise objectives and its action is not always effective when combined with other chemical agents on complex substrates.

After use, then, chemical residues remain in the environment, causing side effects or even dangerous pollution. Moreover they overlap with bad odours and do not transform or reabsorb exhalations.

On the contrary, use of our products acts directly in the process of metabolisation and, above all, does not leave polluting residues because it is biological in nature. The following are the main objectives that use of our compounds makes it possible to achieve in the civil field:

  • Total sanitisation of environments.
  • Diminution of foul-smelling miasmas inside environments, along drain pipes, in septic tanks and in cesspools.
  • Reduction of pathogenic bacteria such as faecal coliforms, Shigella, Salmonella and Pasteurella.
  • Improvement of the COD and BOD 5 of wastewater.
  • Elimination of the presence of hardpans and risk of pipeline obstruction.

 

TESTING

Testing the above-mentioned product on the collectors of sewer networks has achieved these results. This test was conducted using the product in a collector that collects sewage from different homes and industries.

The estimated average population is 6,000 pop/eq (amount of water per capita/day equal to 220 litres). The daily flow rate was 1,320 m3 and the total COD load was: 1.320 m3/day x 860 mg/l = 1.135 kg of COD. For this testing, a dose equal to 1 kg every 400 kg/COD was used for the first month (IMPACT PHASE).

We continued with a maintenance dosage equal to 1 kg every 1,000 kg/COD. The treatment involved the inoculation of different bacterial-enzymatic strains every week at pre-established points of the sewage.

The overall weekly inoculated product dosage was equal to:
1.135 kg/COD/day x 7 days = 7.945 kg/week COD
7.945 kg: 400 kg = 20 kg
inoculated every week, for a total of 4 weeks.

Treatment of water collection basis in Rome:

BEFORE

TREATMENT

AFTER

TREATMENT

Treatment of bioremedation managed by PORTBRENZONE Garda Lake, Verona touristic area of the port interested by growth of macrophytes:

BEFORE

the treatment

AFTER

the treatment

In the following months the dosage was reduced to 5 kg per week (MAINTENANCE PHASE) which was systematically distributed even after the end of
testing. The testing involved the comparison of two equivalent sewage networks in terms of hydraulic flow and concentration in pollutants.
Every week during the treatment a control group  followed the progress of the treatment, noting the presence of sludge and odours in the various inspection wells, the flow rate in m3/sec and any remaining products released for the treatment itself.

OBSERVATIONS ON DATA COLLECTED - SLUDGE

Depending on the course of the sewage network concerned, constant detachment was noted due to the accumulation of sludge along the pipelines but, above all in the points where the product was released, the sludge disappeared completely. After a few days from the second treatment, the total disappearance of organic biomass in almost all the discharge channels could be noted. These observations are confirmed by the witness network, which proceeded with the usual problems of clogging up of wastewater from drains, malodorous exhalations in the streets, and hygienic problems related to animals (rats) that accompanied the wastewater along its path. The action of enzymes combined with that of the bacteria enables complete sanitation and cleaning of the sewage collectors.

ODOURS

Unpleasant odours underwent a drastic decrease until their complete disappearance.

ANALYTICAL PARAMETERS

The results of analyses on samples taken in the various inspection wells of the treated sewage show a decrease in the analytical parameters taken into consideration and compared with the witness parameters.
Analyses of COD are then collected in a table and compare with those of the witness network.

As can be noted, the COD of the witness network is almost constant over time, while the network that is treated undergoes a reduction that varies from about 30 to 38%.
This is attributed to the fact that the enzymatic and microbiological strains contained in the products accelerate the degradation of organic matter by accelerating the processes of diminishing the polluting parameters.

conclusions

The following observations show that:

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