Accumulation And Purification Materials Of Urban Rain Water

Rain water is the important composition of the urban freshwater. However, owing to the radial flow of rain water, the urban water bodies have been polluted badly. Therefore, it is urgent to research and develop novel materials by which rain water could be accumulated and purified. And consequently, the crisis of urban freshwater could be solved to some extent.Accumulation and purification materials for rain water were preparied and investigated in the thesis, and their performance characters were analyzed in detail.Rain water was accumulated by the water absorbent resin after grafted by mineral materials and starches. Water absorptivity and water retention capacity of the resin without mineral materials were very bad, and water absorptivity was about 100g/g, and water content was only 28.6% after 12h. Water absorptivity and water retention capacity of resins grafted by four starches (corn starch, arrowroot starch, cassava starch and potato starch) were very good, but gel strengthes were very low. For example, water absorptivity of cassava starch was above 300g/g, and water content was approximately 20% after 75h, however, gel strength was only 31.6%. The performances of resins grafted by mineral materials were better than those of resins without these materials, especially the performances of resin grafted by Hangjin clay was better than those of resins grafted by bentonite and diatomite. Moreover, the gel strengthes of resins grafted by three mineral materials were higher than those of resin grafted by starches. In conclusion, the resin grafted by Hangjin clay was more optinal for rain accumulation material. In addition, for the resin grafted by Hangjin clay of 65%, the best direction of initiator, crosslinker and the ratio of AA and AM was determined through orthogonal experiment according to the gel strength and the aging ratio. Also, the magnify experiment using the optimized resin was made in order to evaluate its water saving performance .The tenacity and heat stability of and phenol formaldehyde foaming materials added by nylon, were enhanced based on analysis of wear rate and compressive strength. The performance of phenol formaldehyde foaming material was the best when phenol formaldehyde resin was of 20g with surfactant dosage of 1.6-2.36mL, vesicant of 3.46mL, solidfiers of 2.7mL, humectant of 0.4g, foam stabilizer of 0.3g, reaction temperature 70~75℃. The uniformity degree of bubble hole was improved after perlite and men-made asbestos were added.By combining mineral materials (vermiculite, perlite, zeolite, and men-made asbestos) and microorganism removing nitrogen and phosphorus, the assembled system was developed to filter and purify rain water and flood. Pollutants (COD,BOD,SS,NH3-N,TP,TN and so on) in rain water were removed effectively in the system.Diffuse-rooted specie was planted in the experiment. The results indicated that the water lose speed of sample without water absorbent resin was quick, however, lose speed of sample became slow obviously when water absorbent resin was added to. Water absorbent resin grafted by environmental mineral materials had good water retention ability with drought resistant ability and water-economy ability, and could cut short shaping time of lawn and bring excellent economic benefit through magnify experiments in different areas.Moisturizing and ecological bricks were synthesized by adding different water absorbent resin content. The results indicated that water retention capacity of bricks containing 10% water absorbent resin was the best, and plant growth in the brick was favorable.