Seafood man­u­fac­turer sets en­vi­ron­men­tal stan­dards

DEMM Engineering & Manufacturing - - ENVIRONMENTAL -

AN IN­TER­NA­TIONAL ex­porter of seafood ded­i­cated to top world stan­dards of en­vi­ron­men­tal pro­tec­tion and sus­tain­abil­ity has in­tro­duced new high ef­fi­ciency waste­water treat­ment to its Seychelles man­u­fac­tur­ing plant in a pris­tine area of the In­dian Ocean 7,000km west of Perth.

The In­dia Ocean Tuna plant in­cor­po­rates the lat­est Global Wa­ter & En­ergy (GWE) aer­o­bic and anaer­o­bic di­ges­tion plants rep­re­sented in Aus­trala­sia by CST Waste­water So­lu­tions, which says the widely ap­pli­ca­ble tech­nol­ogy will not only achieve out­stand­ing ef­flu­ent qual­i­ties but, de­pend­ing on how it is utilised, can also pro­vide bio­gas.

This re­new­able en­ergy, which has the po­ten­tial to re­place fos­sil fu­els by turn­ing waste­water or­ganic con­tent into green en­ergy, is broadly ap­pli­ca­ble to a wide range of on­shore and off­shore food, bev­er­age, aqua­cul­ture and agriculture pro­cess­ing op­er­a­tions in Aus­trala­sia, says CST Waste­water So­lu­tions Man­ag­ing Di­rec­tor Michael Bam­bridge.

In­dian Ocean Tuna’s seafood pro­cess­ing oper­a­tion is in Vic­to­ria, cap­i­tal of the Seychelles archipelago of 115 is­lands, 600km off the coast of East Afric. They are renowned for their nat­u­ral beauty and are home to UN­ESCO World her­itage sites.

The Vic­to­ria pro­cess­ing plant – an oper­a­tion of the Thai Union Group Pub­lic Com­pany – pro­duces 2,000 cu­bic me­tres a day of waste­water in its pro­cess­ing and can­ning op­er­a­tions.

The new GWE plant is de­signed to re­move over 95 per­cent of or­ganic con­tam­i­nants from the waste­water. The plant, com­mis­sioned this year, uses treat­ment pro­cesses in­clud­ing its glob­ally proven ANAMIX anaer­o­bic waste di­gester to achieve out­stand­ing dis­charge qual­i­ties, and con­vert a mix­ture of waste­water and sludge into bio­gas, which can later re­duce the com­pany’s de­pen­dence on fos­sil fu­els and min­imise their en­vi­ron­men­tal im­pact.

“Such ben­e­fits are also avail­able to any Aus­tralasian pro­cess­ing oper­a­tion with a bi­o­log­i­cal waste stream, in­clud­ing meat, poul­try, fish, dairy, crop and brew­ery and bev­er­age op­er­a­tions, where the tech­nol­ogy in­volved has al­ready been proven in ser­vice,” said Bam­bridge.

The ANAMIX process – which is de­signed to max­imise the con­tact be­tween the anaer­o­bic biomass di­ges­tion process and the bi­o­log­i­cal waste – com­prises a com­pletely mixed anaer­o­bic re­ac­tor, es­pe­cially suitable for the di­ges­tion of waste­water with sig­nif­i­cant fat, oil and grease (FOG) con­tent – as is this case, waste streams from fish and seafood pro­cess­ing.

Dur­ing the ANAMIX di­ges­tion process, anaer­o­bic bac­te­ria con­vert or­ganic con­tam­i­na­tion in sludge and waste­water into bio­gas, which can be turned into meth­ane and later utilised for en­ergy pro­duc­tion and used as fuel for elec­tric power gen­er­a­tors or to re­place fos­sil fu­els in steam boil­ers and heaters on the pro­duc­tion site.

By ex­tract­ing bio­gas ( pri­mar­ily meth­ane) from the or­ganic waste re­moved, the fish pro­cess­ing plant can save more than 2,000 kg/d of fuel oil, worth about USD 1,000 per day, de­creas­ing the fos­sil fuel de­pen­dency of the com­pany, and re­duc­ing its en­vi­ron­men­tal foot­print. Such sav­ings can amount to hun­dreds of thou­sands of dol­lars a year and achieve a rapid ROI for the waste­water treat­ment plant, says GWE.

“With world seafood pro­duc­tion now top­ping 170 mil­lion tons – both from fish­eries and aqua­cul­ture – there is ob­vi­ously great scope glob­ally for GWE tech­nolo­gies such those adopted by In­dian Ocean Tuna to de­liver a more sus­tain­able en­vi­ron­men­tal out­come. This plant sets global bench­marks for en­vi­ron­men­tal out­comes and com­mer­cial sus­tain­abil­ity,” says GWE.

With its new waste­water treat­ment plant, In­dian Ocean Tuna sig­nif­i­cantly re­duces its im­pact on the sur­round­ing wa­ter and grounds. Ap­pli­ca­tion of the anaer­o­bic di­gester such as ANAMIX and me­chan­i­cal de­wa­ter­ing by means of screw press con­trib­utes to sig­nif­i­cant re­duc­tion in dis­posal costs and lower land­fills re­quire­ments for their solid waste.

GWE, which has more than 400 waste­water plants in 64 coun­tries, has re­cently re­branded from Global Wa­ter En­gi­neer­ing to re­flect a grow­ing fo­cus on turn­ing waste­water into green en­ergy.

Ben­e­fits of the GWE tech­nol­ogy in­clude:

• Ef­fec­tive or­ganic con­tam­i­na­tion re­moval from the waste­water stream be­fore dis­charge min­imises the im­pact on the en­vi­ron­ment.

• Up to 3,000 cu­bic me­tres a day of bio­gas gen­er­ated can be utilised by In­dian Ocean Tuna in many prof­itable ways, rang­ing from use in the com­pany’s boiler and heat pro­cesses through to pro­duc­tion of green elec­tric­ity for com­pany or com­mu­nity use.

• An ad­di­tional en­vi­ron­men­tal ben­e­fit is the plant’s low space re­quire­ments for land­fills, due to the ad­vanced man­age­ment of sludge by ap­pli­ca­tion of the ANAMIX di­gester and sludge de­wa­ter­ing unit screw press. The process de­liv­ers sig­nif­i­cant sludge dis­posal cost sav­ings.

• Me­chan­i­cal sludge de­wa­ter­ing with a screw press process that al­lows high dry solids con­tent and con­trib­utes to the sig­nif­i­cant re­duc­tions in dis­posal costs. Bam­bridge says that not only is the plant in­stalled by In­dian Ocean Tuna an en­vi­ron­men­tal boon for the Seychelles, but also bio­gas- pro­duc­ing green en­ergy plants such as this can help pay for them­selves. So there is a strong busi­ness prof­itabil­ity case to sup­port com­pa­nies wish­ing to act in an en­vi­ron­men­tally re­spon­si­ble man­ner,” says Bam­bridge, whose com­pany is cur­rently in­volved in en­gi­neer­ing waste sludge and waste­water treat­ment so­lu­tions in en­vi­ron­men­tally sen­si­tive ar­eas rang­ing from main­land farm­lands, fac­to­ries and pro­cess­ing plants through to Out­back and World her­itage ar­eas such as Lord Howe Is­land.


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