The lack of access to clean water remains a severe issue all over the world. Coupling photocatalysis with the membrane separation process, which is known as a photocatalytic membrane reactor (PMR), is promising for water treatment. PMR has developed rapidly during the last few years, and this paper presents an overview of the progress in the configuration and operational parameters of PMRs. Two main configurations of PMRs (PMRs with immobilized photocatalyst; PMRs with suspended photocatalyst) are comprehensively described and characterized. Various influencing factors on the performance of PMRs, including photocatalyst, light source, water quality, aeration and membrane, are detailed. Moreover, a discussion on the current problems and development prospects of PMRs for practical application are presented.

In this paper, we study the existence of positive solutions for the following generalized quasilinear Schrödinger equation $$-\; <!--\; -\; -->\mathrm{div}\; <!--\; \; -->(g^p(u)|\mathrm{\nabla \; <!--\; \nabla \; -->}u{|}^{p-\; <!--\; -\; -->2}\mathrm{\nabla \; <!--\; \nabla \; -->}u)+g^{p-\; <!--\; -\; -->1}(u)g^{\prime }(u)|\mathrm{\nabla \; <!--\; \nabla \; -->}u{|}^p+V(x)|u{|}^{p-\; <!--\; -\; -->2}u=K(x)f(u)+Q(x)g(u)|G(u){|}^{p^{\ast \; <!--\; \ast \; -->}-\; <!--\; -\; -->2}G(u),x\in \; <!--\; \in \; -->{\mathbb{R}}^N,$$ where $N\ge \; <!--\; \ge \; -->3$, $1<p\le \; <!--\; \le \; -->N$, $p^{\ast \; <!--\; \ast \; -->}=\frac{Np}{N-\; <!--\; -\; -->p}$, $g\in \; <!--\; \in \; -->{\mathcal{C}}^1(\mathbb{R},{\mathbb{R}}^{+})$, $V(x)$ and $K(x)$ are positive continuous functions and $G(u)={\int \; <!--\; \int \; -->}_0^{u}g(t)dt$ . By using a change of variable, we obtain the existence of positive solutions for this problem by using the Mountain Pass Theorem. Our results generalize some existing results.

The use of constructed wetlands (CWs) in the treatment of raw wastewater in China has proved to be very successful in recent decades. However, it is not known whether surface-flow constructed wetlands can effectively purify irrigation return water. To investigate the performance of a constructed wetland in terms of meeting the goals of pollutant purification, the 8th drainage of Ulansuhai Lake was used for this study. Pollutant removal performances, as well as hydrological characteristic variations in relation to specific characteristics of plants, were investigated utilizing two years of monthly average data. The results indicated that surface-flow constructed wetlands can effectively change the physical characteristics of return water and lead to a sharp decrease in pollutant concentrations. The 1200 m long, narrowly constructed wetland resulted in the average reduction rates of total nitrogen (TN) and total phosphorus (TP) of up to 22.1% and 21.5%, respectively. The overall purification efficient of the constructed wetland presented seasonal variations in four different monitoring periods (May, July, September, and November). Constructed wetlands with multiple types of plants exhibited higher efficiencies in pollutants removal than those with a single type of plant. The current study can provide meaningful information for the treatment of agricultural wastewater.