Sustainable water system of a green residential zone:demonstrated with a case of a campus construction project

The sustainable water system (SWS) was interpreted based on green residential zone associated codes issued by P.R.China and some other countries,and ecological principles.Its constitution,designing and engineering,and economic and environmental benefits were illustrated with a case of a campus construction project.The SWS incorporates divided nature drainage systems,grey water treatment and reuse technologies,rainwater decentralized collection and purification technologies,and water quality safeguard techniques for reclaimed water reused for landscaping.Application of the SWS is expected to gain remarkable economic and environmental benefits by reducing both the demand for municipal water supply and sewage discharge.

Associations of Residential Greenness with Depression and Anxiety in Rural Chinese Adults

BACKGROUND Depression and anxiety are top contributors to non-fatal health loss globally.Several studies have indicated the association between residential greenness and mental health.METHOD The participants(n=27,366)were recruited from four counties in Henan Province,China during 2015–2017.Symptoms of depression and anxiety were evaluated using the Patient Health Questionnaire-2(PHQ-2)and the Generalized Anxiety Disorder-2(GAD-2)in the baseline survey.The level of residential greenness during the 3-year period before the baseline survey was assessed using the Moderate Resolution Imaging Spectroradiometer(MODIS)Normalized Difference Vegetation Index(NDVI)and Enhanced Vegetation Index(EVI).The mixed-effect linear regression model was applied to examine the associations of residential greenness with depression and anxiety.RESULTS The results of adjusted models showed that the score of PHQ-2(Dscore and 95%confidence interval[CI])decreased by-0.024(-0.041,-0.006)and-0.022(-0.038,-0.004)with an interquartile range(IQR)increase in NDVI and EVI within a 1,000-m buffer radius,respectively.The score of GAD-2(Dscore and 95%CI)decreased by-0.024(-0.040,-0.006)and-0.028(-0.044,-0.011),in relation to an IQR increase in NDVI and EVI within a 1,000-m buffer radius,respectively.CONCLUSIONS A higher level of residential greenness was significantly associated with lower risk of depression and anxiety in rural areas of Henan Province.Improving residential greenness accessibility may help to promote the mental health of rural populations.