15 Dicembre 2015 Istituto Conciario G.Galilei Arzignano

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Daniele Refosco, Acque del Chiampo: Concerie a ciclo completo: l’analisi LCA da qui al futuro.

Tanneries with the full cycle process : LCA analysis from

here to the future

Ing. Refosco D.

Adc role in the project Technical-analytical consulting and processing of analytical data in order to assess:

• the potential impact on the functionality of the wastewater treatment plant due to the new technologies proposals of all the partners;

• which may be the impacts of new study technologies if they was adopted by other (or all) of the companies linked to the waste water treatment plant.

Adc role in the project The evaluations will be done on theoretical projections made by:

• collection of historical data;

• collection of more information on the production and processing cycles at all tanneries linked to the wastewater treatment plant ;

• collection of data from experimentations with companies that have carried out;

• extrapolations.

What we have done

• Identified 20 tanneries that have studied the same processes in the Greenlife project;

• 27/06/2014 started the monitoring on tannery wastewater (at November 1152 sampling / analysis);

• Visit the tannery partners;

• Sampling and analysis at all the stages of processing;

• Cognitive census.

Cognitive Census

• Between November and December it has been prepared a cognitive census about the liming process and tanning process in the district of Arzignano for the year 2014.

• The census sent on 16/03/15 allowed to obtain sufficient information to be able to extrapolate the various data collected and further estimate a possible impact on the environment until the adoption by the tanneries investigate new technologies under development

CensusSurveyed tanneries:

The 20 surveyed tanneries (identified from 130) in function of the processes can be divided as follows:

• 4 exclusively process liming and tanning;

• 8 predominantly process liming e tanning;

• 8 the full cicle process.

CensusManufacturing 2014:

HIDE U.M. Results

Hide ton/year 178043Hide (fresh) % 30,6Hide (salted) % 69,4Europe % 91Extra-Europe % 9Cattle % 88,22Calves % 11,57Horses % 0,2Sheep/goats % 0,01

CensusIncidence:

Parameter U.M. load Incidence %

Volume m3/year 3.820.640 46TSS ton/year 14.453 70COD filt ton/year 17.226 58Clohrides ton/year 19.103 85Sulfates ton/year 7.674 53TKN filt ton/year 1.458 49Chromium ton/year 388 61

CensusLiming process:• The liming process has an exhaust volume of 24% in the tannery discharge

process and 11% total wastewater volume for the waster water treatment plant;

• 4 tanneries are equipped with a recovery plant for the liming baths, in which 3 (7.5% of the discharged volume) the liming process is recovery in each bath;

• The average percentage of total sulphides total used, compared to the average for those who do not use recovery, show a decrease of about 45%;

• Only four tanneries are equipped with a recovery plant recovery for the hair and only two of these use it.

CensusChromium tanning:• The tanning process has an exhaust volume of 17% in the tannery

discharge process and 8% total wastewater volume for the waster water treatment plant;

• The amount of leathers tanned with chromium is about 123,600 tons (approximately 69% of the total);

• Have been used about 1294 tons of chromium, with a ratio of about 10 kg of chromium per tonne of tanned leather;

• The tanneries equipped with a plant for the recovery of chromium are two, but only one was active in 2014. Part of the chrome was recovered within the tannery and part disposed of in landfills.

CensusChrome free tanning:

• The chrome-free tanning process has an exhaust volume of 9,5% in the tannery discharge process and 4,4% total wastewater volume for the waster water treatment plant;

• There are 9 tanneries that do the chrome-free tanning and only one of these do exclusively chrome-free tanning;

• The amount of chrome-free tanned for 2014 is about 40.800 tons (about 23% of the total);

• The mainly tanning agents used in the chrome-free tanning are glutaraldehyde and oxazolidine;

LCA

LCA (Life Cycle Assessment) is a methodology for assessing the environmental impact of a product or service in its entire life cycle.

As the life cycle are defined consecutive and interconnected steps for the production of a good or the supply of a service, including the extraction and processing of raw materials used, the manufacturing, transportation, distribution, use, reuse, recycling and final disposal.

LCA Acque del Chiampo

The life cycle starts with the collection of wastewater from industry and civil, then includes the steps of treatment at the wastewater treatment plant and ends with the production and stabilization of output as sludge and treated wastewater.

The study will provide a picture of the distribution of impacts at various stages of life cycle analysis, taking into account the efficiency of sewage treatment plant for the major physical and chemical parameters.

The LCA is a tool that facilitates the assessment of future changes in the environmental impacts related to possible changes of the input elements and / or process steps, so for example the impact of a change in tanning processes object of the Life project.

LCA: Assessment of impacts

Will be quantified the impacts regarding the service of waste water purification for the following categories of environmental impact:

•Greenhouse effect;

•acidification;

•Reduction of the ozone layer;

•Photochemical smog;

•eutrophication;

LCA: Assessment of indicatorsFurther will be investigate the following environmental indicators:

•hazardous and non-hazardous;

•greenhouse from biological resources;

•aquatic ecotoxicity;

•production of by-product;

•land use

•toxic emissions to air (hydrogen sulfide, VOCs, organic aerosols).

Thanks for your attention