农村生活污水对水环境的影响——以老沂河为例OA

[Objective]The treatment of rural domestic wastewater is the most significant obstacle hindering the construction of beautiful countryside in China,severely impacting the improvement of regional water environment quality.[Methods]In order to explore the influence of rural domestic wastewater on river water environment,this paper took the catchment area of the Laoyi River as an example,conducting water environment monitoring on 24 main tributaries and the main stream of the Laoyi River,using townships as the division units to preliminarily discuss the correlation between the regional domestic wastewater collection rate and water environment quality.[Results]The wastewater collection rate of each unit obeyed the order of Caoqiao Town(48.26％)＞Yaowan Town(43.08％)＞Chenlou Town(38.51％)＞Paoche Street(30.62％),presenting a positive linear correlation between the collection of rural domestic wastewater and the proportion of superior class Ⅲ water bodies in the region,the index of fit degree reached 0.977 1.From the pollution factors of ammonia nitrogen and total phosphorus pollution degree,the mean ammonia nitrogen mass concentration in four townships obeyed the order of Paoche Street(0.46 mg/L)＞Caoqiao Town(0.37 mg/L)＞Yaowan Town(0.26 mg/L);Mean total phosphorus mass concentration obeyed the order of Paoche Street(0.28 mg/L)＞Caoqiao Town(0.25 mg/L)＞Yaowan Town(0.21 mg/L).The lower collection rate of rural domestic wastewater,the higher pollution degree of regional rivers.The fact further proved that the discharge of rural domestic wastewater brought more serious pollution to regional water environment quality.[Conclusion]The permanganate index,ammonia nitrogen and total phosphorus of the main stream of Laoyi River show that the water environment quality of the lower reaches is worse than that of the upper reaches,the abnormal performance of total nitrogen may be caused by the closure of Huayi Gate,the insufficiency of upstream ecological flow,and water grass putrefactive fermentation.