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Instituto Politcnico NacionalUnidad Interdisciplinaria De IngenierasCampus Guanajuato

PROTECCIN AMBIENTAL

5BM1

Water treatment for: Industrial and municipal effluentsBy:Gallardo Zugarazo AdahiMartnez Juan Carlos

Index Title page...........Page 1Index .......Page 2Introduction .................Page 3Convectional Technology................................... Page 4Equipment ....Page 5 Description .......Page 6Comparison .........Page 7Examples ...Page 8Conclusions ..Page 9References ...Page 10

Introduction Throughout Mexico, Degremont has different treatment plants for diverse purposes: wastewater treatment, potabilisation of water, water desalination and reuse of treated water, in addition to various development projects like Salina Cruz and Tenorio Villa Reyes.

Degremont reached Mexico in 1969 as a licensee company and in 1978 Degremont of Mexico SA de C.V. is created, since then, it has built more than 300 water treatment plants and sludge in the major cities of the country during it trajectory.Conventional Technology Degremont uses a combination of technologies with the only purpose of provide water treatment service of quality and sustainably. Using a combination of physical, chemical and biological methods in each processes at different stages of the treatment.Equipment

Packed bed BioreactorDirect Removal: BOD, Suspended solids, settle solids, Nitrogen, fecal coliforms.

Indirect removal: Turbidity, Chloride, Phosphorus, oils, lipids and pH regulation.An aerobic process is characterized in order to degrade organic matter through microorganisms packed in the reactor. The effluent is fed on the top of the reactor by pumps, so the packing is totally submerged.

We can find diverse types of these reactors such as: fixed bed, membranes bioreactor, biodiscs, Raschig rings and son on.

ApplicationSewage ( hotels, restaurants, hospitals, oil platforms)Greywater ( houses, hotels, industrial laundries)Industrial waters ( fishing industry, textile)

A comparison between both systemsPacked bed bioreactor

AdvantagesDisadvantagesHigh EfficiencyNeeds pre -treatment for big solidsRequires less space than activated sludgesNeeds constant aeration Low operation requirements Possible saturation of microorganisms Odor freeAnaerobic bacteria growthCurrent systemAdvantagesDisadvantagesWell systematized Not deodorized since the beginning of the processImproved qualityToo many stepsWorks for many pollutants High costExamples of using packed bed bioreactorIsolated houses ( Norway)AquacultureShipsCarwash

Conclusion If we look close to the technologies used by Dregemont we can see they are using a wide variety of physical, chemical and even biotechnological technologies.

An interesting question would be : are those biological systems efficient enough or shall we bet for other reactors based on biotechnology?

As Dregemont is present in many countries and they claim to promote diversity, it would be expected such technologies might be of their concern.

References http://www.degremont.com/en/about-us/profile/water-treatment-partner/partner-of-local-authorities-and-industries/

http://www.degremont.com.br/ES/Tecnologia/Pages/Aguas-Usadas.aspx

Hendricks, D. Water treatment unit processes. CRC Press. 2011

http://www.degremont.com/en/commitments/diversity/diversity/

http://www.sinia.cl/1292/articles-49990_32.pdf