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Abstract [Objective] This study was conducted to investigate the effect of laundry wastewater on the quality of river water and the dilution purification effect of river water on laundry wastewater. [Method] The effects of laundry wastewater on the contents of total nitrogen (TN), total phosphorus (TP), suspended solids (SS), chemical oxygen demand (COD) and linear alkylbenzene sulfonic acid (LAS) were studied in 7 rivers of Shaoxing City. [Result] (1) The contents of TN, TP, SS, COD and LAS increased by 92%, 99%, 340%, 351% and 923%, respectively, at the discharging moment of laundry wastewater; and (2) the five pollutional indexes significantly decreased over time, and especially 2 h after the discharge of laundry wastewater, compared with former the discharge of laundry wastewater, the contents of TN, TP, COD and LAS increased by 6%, 11%, 9% and 13%, respectively, while the contents of SS still increased by 76%, i.e., SS required a longer time to achieve self-purification. [Conclusion] Laundry wastewater has some influence on thequality of river water, and the self-purification function of river water could effectively remove pollutants.
Key words Laundry wastewater; Self-purification; Total nitrogen; Total phosphorus; Linear alkylbenzene sulphonic acid
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China is a country with a large population, while the water resources per capita is scare, and China has become one of the 12 countries and areas suffering serious water shortage in the world [1]. Espe dally, with rapid economic development, water quality become poorer day by day, making the protections of water resources is especially urgent. Shaoxing as a water county is distributed with dense rivers, which people live along with and people get water from. However, with rapid economic developments in Shaoxing, especial for the influx of immigrant workers which bring about many effects, such as more domestic sewage [2]. Further more, the development of agriculture around the urban area gives rise to the problem of abuse of agrochemicals and chemical fertilizers, resulting in non-point source pollution to a large area of farmland131. Such domestic wastewater and agricultural wastewater are discharged into rivers to different degrees, resulting in pollution to river water to different degrees, such as destruction of aquatic ecological environment, including water eutrophication and overgrowth of alga in water body141. In recent years,...