Laundry Habits in Bangkok: Use Patterns of Products and Services

Unravelling capability of municipal wastewater treatment plant in Thailand for microplastics: Effects of seasonality on detection, fate and transport

Many factors can affect microplastics (MPs) behaviors in aquatic environments. The effects of seasonal and meteorological conditions on MPs are not well understood. This study demonstrates the impacts of seasonality on the fate and transport, and the efficacy of MPs removal by a wastewater treatment plant. The fate and transport of MPs at a WWTP in Nonthaburi, Thailand were tracked during the dry and wet seasons of 2019-2020. Polypropylene (PP), polyethylene (PE), and toothpaste formulations were the most abundant MP types observed. Total detected MP quantities ranged between 76 and 192 particles L^-1 during the dry season, and only 36-68 particles L^-1 during the wet season, indicating runoff dilution effects. T-test analysis found a statistically significant difference between MP concentrations between the dry and wet seasons of 2019-2020. Spearman's correlation showed statistically strong negative relationships between MP concentrations versus wastewater flow, and MP concentrations versus precipitation; a positive correlation between MP abundance versus temperature in the treatment system was observed. During the dry seasons, MPs were mostly found in the aeration process, and were mostly rayon or polyester particles in the shape of fibers. Contrarily, in the wet seasons, MPs were detected in both the raw influent and aeration process, with PE, polyacrylate, and polyethylene terephthalate fragments dominating the make-up. MPs were also detected in the return activated sludge, thus calling for proper sludge age and drainage management. No MPs were detected in the plant's effluent during the wet season, suggesting that the plant had sufficient MPs removal capability during normal wet-season conditions. Overall, this study suggests that municipalities should focus on increasing MPs removal efficiency of wastewater treatment plants for dry seasons, while properly managing the water flows of combined sewage systems to prevent overflows that may inevitably become point-sources of MPs release into water bodies during wet seasons.

Consumer Motivation and Environmental Impact of Laundry Machine-Sharing: Analysis of Surveys in Tokyo and Bangkok

A sharing economy is an alternative system that enables pro-environmental behavior by improving efficiency through product-sharing. However, some motivations and requirements for doing laundry can increase the environmental burden, which suggests that the laundry machine (LM) sharing is not necessarily sustainable. This study clarifies consumer motivations for laundry usage and assesses the feasibility of environmentally sustainable laundry behavior through LM-sharing. Consumer surveys were conducted in Tokyo and Bangkok with different LM-ownership proportions. Single-person households were targeted, reflecting Tokyo’s demographic situation. A scenario analysis was conducted to evaluate the effect of routine laundry behavior changes on greenhouse gas (GHG) emissions. Three main results emerged. First, Tokyo respondents used a coin-operated laundry machine (CL) for convenience, which private washers cannot provide, while Bangkok respondents used it for basic laundry needs. Consequentially, the Tokyo respondents, who used CLs, were responsible for more than three times the GHG emissions of Bangkok respondents. Second, the group using both private LM and CL was the least GHG-efficient group, regardless of region. Third, laundry behavior can reduce GHG emissions if consumer requirements are decreased. The results show that there is environmental significance in adopting LM-sharing for sustainable consumption and production systems that reflect regional characteristics.