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Thermogravimetric analysis (TGA) and differential thermal gravimetric (DTG) were used to study the efficiency of slow pyrolysis of chicken skin waste (CSW) through determining the apparent activation energy. CSW was heated from 50°C to 900°C at 5°C/min, 10°C/min, 15°C/min, and 20°C/min. The CSW was further investigated in pyrolysis using a fixed bed reactor where the maximum production of bio-oil was achieved at 550°C. The crude bio-oil products demonstrated different classes of organic and complex mixture of hydrocarbons compound. The proposed decomposition pathway suggested that most CSW was cracked around 340–440°C even at a low heating rate to produce mostly long-chain hydrocarbons. [ABSTRACT FROM AUTHOR]

The disposal of discarded disposable diapers (D3) is a critical eco-technological problem that is exacerbated by the exponential increase in global consumption each year. Global production of D3 is increasing exponentially and approximately 20 billion used diapers are sent to landfills each year, generating more than 3.5 million tonnes of diaper waste that requires almost 500 years to be fully decomposed. The disposal of D3 has resulted in significant environmental issues and public health hazards. The objective of this study was to provide a systematic review and in-depth discussion of the strategies, challenges, and recent breakthroughs in addressing the problems resulting from the generation and disposal of D3. A systematic literature search was conducted using three electronic databases (Google Scholar, Scopus, and ScienceDirect). Four peer-reviewed studies were selected from the 2287 articles found. Thermochemical technology is claimed to be suitable for the treatment and recycling of used diapers, especially with regard to the use of potentially safer and cleaner technologies with minimal costs. It was established that pyrolysis of D3 could yield useful end products with a wide range of applications, hence providing a future research direction to improve the efficiency of these processes in recycling this waste. • Production of D3 is increasing exponentially and approximately 20 billion used diapers are sent to landfills each year. • The temperature setting for the thermochemical procedure of D3 depends on the technique applied (200 – 900 ℃). • Chemical activation slightly enhanced lead removal from 96.2% to 98.2% (KOH) – 99.8% (ZnCl 2). • Reaction conditions (temperature, pressure, and time) are critical impact D3 biochar yield and product quality in pyrolysis. [ABSTRACT FROM AUTHOR]