China's Wastewater Treatment Industry: Opportunities
Moreover, China’s rural regions suffer the most from water shortages and water pollution. Rural distribution of wastewater treatment is extremely poor. Only 3 percent of villages and townships possess wastewater treatment facilities, and more than 90 percent lack proper drainage and sewerage facilities. 300 million rural residents do not have
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- Can polyacrylamide improve soil fertility and crop yield?
- Improving soil fertility and crop yield through application of soil amendments such as polyacrylamide (PAM), lime, gypsum, and biochar to agricultural land has emerged as a strategy in numerous countries (Agegnehu et al. 2016; Lee et al. 2015; Sojka et al. 2007). PAM is non-toxic and environmentally friendly (Entry et al. 2008; Song et al. 2018).
- Does polyacrylamide increase teff yield?
- Overall, this study demonstrated that the use of polyacrylamide (PAM) with biochar on slightly acidic, and with lime on moderately to strongly acidic soils increased teff yield with highest net benefit and marginal rate of return than application of PAM, gypsum, lime, biochar, and farmyard manure alone or PAM + gypsum treatments and the control.
- Does anionic polyacrylamide reduce soil erosion?
- Anionic polyacrylamide (PAM) has the potential to reduce soil erosion through soil conditioning. However, a comprehensive study about its effectiveness especially when applied combined with other amendments have rarely been conducted in the tropical highland climatic conditions, such as in Ethiopia.
- Does gypsum & lime reduce runoff & soil loss?
- Applying PAM in combination with sources of an electrolyte, such as gypsum or lime (Ca 2+), enhanced PAM effectiveness in reducing runoff and soil loss (Kebede et al. 2025); PAM + lime reduced the loss of soil P associated with runoff and sediment (Jiang et al. 2010; Lepore et al. 2009) by improving soil water infiltration (Lee et al. 2010).
