Co-processing, solution for industrial waste

Thursday, May 25, 2017 09:00

Footwear waste is completely destroyed by the heat of 2000 celcius in the cement kilns. — VNS Photo

Viet Nam is the third largest footwear maker in Asia and fourth in the world (behind China, India and Brazil), accounting for about 10 per cent of global production.

Leather and footwear products are also a key export item for the country, accounting for 10 per cent of revenues.

The Ministry of Industry and Trade recently unveiled a plan for the development of the country’s leather and footwear industry.

It expects exports of leather and footwear to increase 10-15 per cent a year between 2016 and 2020 and 8-9 per cent the next five years.

There are around 1,700 companies in this sector employing 1.2 million workers.

However, too much of anything is not good, especially with the footwear industry having a huge environmental impact.

With the development plan, the lack of a controlling and monitoring system and funds shortage make the need for effective waste management and treatment solutions more important than ever.

Prof Dr Nguyen Mai, chairman of the Association of FDI enterprises, once talking about the wave of FDI investment in the footwear industry in Viet Nam, has warned that the industry poses a high risk of pollution and therefore it is necessary to select suitable projects to avoid environmental disasters.

World Bank economist Pham Minh Duc said: “Investments in the upstream sector must be accompanied by stricter environmental regulations because the [footwear] industry discharges a large volume of wastewater and pollutants. So Viet Nam is at risk of using toxic chemicals. To mitigate these impacts, Viet Nam needs to have policies that encourage the use of advanced and environmentally friendly technologies."

Under increasing pressure from consumers, society and the Government, the footwear industry is seeking ways to become more sustainable.

Though manufacturers would like dearly to be sustainable and environment-friendly, there are limitations with respect to the information they have about technologies and their adoption due to financial issues.

According to experts, 25 per cent of the leather used is discharged and causes bad odour.

Duc said: “Burning wastes from the footwear industry creates large amounts of dioxin. If not treated with the right method, it will have fatal impacts on human beings.

“Even storing this kind of waste in the wrong manner causes chemicals to leak into soil and water, destroy the environment and damage public health.”

At the end of last year a factory owned by Dao Quang Viet in Kien An District, Hai Phong city, which burnt footwear waste, was severely criticised by neighbors. Vietnam Law newspaper carried out an investigation and found that the 1,200sq.m facility stored a huge amount of rubber and leather shoe soles and PVC.

The facility has a two-metre high fence, but dumps waste outside. Residents of Lam Ha Ward reported that the plant’s main work was recycling footwear waste into plastic, and its 20-metre chimney discharged swirling black fumes day and night.

In 2011 the footwear industry was involved in a serious case of violation of waste treatment laws in Binh Phuoc Province.

The Dong Xoai town police inspected a facility belonging to Thai Binh Leather and Footwear Company in Tan Dong Ward, and discovered it landfilled solid wastes in front and directly discharged effluents without treatment.

The inspection uncovered that the plant had landfilled more than 160 cubic metres of PVC, plastic packaging, PU and other wastes.

The management blamed the company’s partner, a waste treatment company, for it. It had stopped its work due to several problems. Every day the facility discharged one cubic metre of waste, and the electricity company insisted it should clear the waste so that it could do construction.

Co-processing proved to be more effective than incineration thanks to no residues being left out. — VNS Photo


While waste management in certain industries has been a perennial problem in Viet Nam with State agencies being responsible for finding solutions for waste management and garbage disposal, some corporate players are forging ahead with modern technologies to resolve the problem and draw closer to nature.

Large footwear companies have also been looking for long for ways to reduce and eliminate the practice of landfilling waste.

Viet Nam’s most popular waste disposal methods are incineration and landfilling. However, handling the waste generated daily is becoming more and more of a problem as the technology at incineration plants is very basic and therefore insufficient.

Though these plants are assessed by the Government for technical standards and gas emissions, Viet Nam lacks the technology to identify dioxins and other pollutants.

Garbage collectors are not sufficiently monitored or tracked, and their backyard facilities have insufficient waste treatment capabilities. This poses a serious threat to people and the environment as ground and surface water are often contaminated by this untreated waste.

“Consequently, efficient waste management is one of the biggest social and environmental challenges,” a sustainability report by a footwear manufacturer said.

“One proven alternative and possible solution on the way to a ‘zero waste society’ in Viet Nam is the so-called ‘co-processing’ technology with the help of which waste is transformed into thermal heat to produce cement with strict quality control.”

Footwear waste is one of the hard pressures to manufacturers — VNS Photo

Co-processing: transform disposal waste

Co-processing makes best use of the 2000 degree Celcius heat in cement kilns to completely destroy waste, leaving no residues for landfilling and thus reducing CO2 (carbon dioxide) emissions.

Geocycle, a waste management brand of Holcim (now Insee), takes over wastes from a wide range of footwear manufacturers in Viet Nam and has so far converted 690,000 tons of industrial waste, which would have affected even groundwater if dumped into the environment.

Its work has a triple benefit – waste management, contributing to a cleaner environment; reduction in the consumption of fossil fuels with the generation of energy from the waste; and thus reduction in emission of greenhouse gases.

Nguyen Thanh Danh, an independent environmental evaluator told Viet Nam News that Geocycle is a pioneering company in waste management offering professional and environmental-friendly waste disposal.

He said its method is a globally established best practice to dispose of hazardous wastes. It is technically advanced and superior to landfilling and incineration since there are no residues.

“Though the price for this treatment is higher than for burning, it brings a lot of benefits to society by discharging nothing into the environment.”

Co-processing is recognised and encouraged by international institutions such as the World Health Organization, World Business Council for Sustainable Development, Hazardous Chemical and Waste conventions, the Basel Convention, The European Cement Association, and GTZ (German Technical Corporation).

A report released at the 2015 national environment conference showed there were almost 458 solid waste landfills in Vieät Nam with an area of more than 1 hectare each and countless smaller landfills. An efficient solution is needed for this.

Large attention should be drawn to co-processing. — VNS

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