Abstract：By extracting microplastics (MPs) in the water and sludge samples, the occurrence of MPs in a coastal municipal sewage plant in Shanghai was studied. This study firstly investigated the characteristics and emissions of MPs in the coastal WWTP of China. Fiber was the most common shape. Rayon was the most common polymer type in the influents. In the effluents, synthetic leather accounted for the largest porpotion followed by rayon, polyester and polyethylene. The abundances of MPs in the influents, mixed water, effluent and sludge stages were 117n/L, 90n/L, 52n/L and 180n/50g (wet weight), respectively. The removal efficiency of microplastics in the WWTP was 55.6%. Cursory calculations estimated the abundance of MPs in the waters decrease from 3.276 trillion in the influents to 1.456 trillion in the effluents, and the excess sludge contain approximately 54million MPs. Moreover, a miscalculation of personal care product MP discharge from the mainland China to the ocean was also be discussed.
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