Rice husk was used as an adsorbent to study the adsorption of Cr (VI) from wastewater, Based on the experimental studies on influences of the particle size of rice husk, solution pH value, adsorption time, temperature and rice husk dose, the optimal conditions of the adsorption were determined as follows: temperature of 35°C, pH of 2, the particle size of rice husk in the range of 80-100 mesh, adsorption time of 3h, dose of 30g/0.2g. Under the optimal conditions, the removal rate of chromium from wastewater by rice husk can reach 91%.
The water resources of the local west are seriously lacking, and most of water is brackish water with high contains of fluorine quantity. This topic used the RO desalination processing craft to desalt the water in order to provide the drinkable water in the west. The result indicated that the RO brackish water desalination technology is feasible, the quality of desalinated water can meet the national drinking water health standard.
To make full use of existing facilities , process reconstruction line is proposed including three precipitation, floatation and biological treatment after the analysis of the problems in existing treatment process of the paper-making wasterwater, The results showed that: after the reconstructive wastewater treatment system, the quality of effluent has reached the secondary standard of Integrated Wastewater Discharge Standard (GB8978-96).
The cost model for optimal design of drainpipe network was formed, according to the conception of total life cycle management,and the functional relation of drainpipe construction cost and tube diameter and burial depth was fitted, according to the quota of index of estimate,this made that it is possible to estimate total life cycle cost of drainpipe network accurately.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.