Behind every cup of boba is a pile of tea waste, but this start-up is proving it’s far from useless
Bubble tea is hardly new in Asia, but the scale of the continent’s tea drink industry is unprecedented. In 2025, three Chinese tea drink chains—Mixue Group, Guming Holdings and Auntea Jenny—listed on the Hong Kong Stock Exchange, raising more than US$700 million. But behind the hype, the waste generated by the industry at all stages of production, from tea farms and factories to beverage stores, is quietly adding to the region’s food waste problem.
“Tea waste can be considered a form of food waste, and there isn’t yet a practical method for processing it effectively,” says Calvin Sio, founder of sustainable start-up Zence Object. “Typically, food waste is either incinerated or sent to landfills, [where,] once buried, it begins to decompose and release a gas known as methane.”
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Methane is a powerful greenhouse gas that accelerates climate change by trapping large amounts of heat in the atmosphere. It also harms air quality by contributing to the formation of ground-level ozone, a dangerous air pollutant. According to the Climate and Clean Air Coalition, a global network of government and non-governmental bodies, around 20 per cent of global methane emissions come from waste, including food and other organic materials left in landfills, open dumps and wastewater.


Sio’s start-up upcycles tea waste from factories operated by tea brands and tea farmer cooperatives, mainly in Guangdong and Fujian, transforming it into bio-based boards and plastics for manufacturing a range of products, including packaging, drinking cups and components for electronic appliances.
Upcycling tea waste is only the starting point—one Sio chose because of the surging demand for tea-based drinks. The company is also working with other agricultural waste, such as coffee grounds, leftover sugarcane and bamboo.
Over the past year, the company processed about 250 tonnes of tea and other agricultural waste. “We focus on plant-based waste because it contains a wealth of fibres, which are among the biggest resources available for recycling,” he explains.
As agricultural waste varies widely in size, texture and moisture content, the company has been focusing on standardising its recycling processes and expanding the range of materials it can handle. Sio, who was recognised as a Gen.T Leader of Tomorrow in 2025, says the core steps remain the same: breaking it down into clean fibres, remaking those fibres into raw materials, then using them to manufacture green products.
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