Inhibition Effects of Full Degradation Barley Straws on Algal

How to control water eutrophication bloom having been the difficulties in the field of environmental engineering. Various measures have been taken to control the occurrence of algal blooms and slow down the outbreak of the frequency, such as source control (non-point source pollution control and abatement nutrient loading, sediment dredging, etc.), inhibition algaecide measures (artificial salvage or kill algae, etc.) have failed to achieve the desired effect, which had the effect only in the short term, even some improper physical or chemical methods had exacerbated the fragile wetland ecosystem. Therefore, to explore effective, economical, and no secondary pollution, low ecological risk control algal blooms method is an important task for environmental science. In this paper, barley straws with pretreated (nitrogen and phosphorus) were added to the eutrophication water bodies, to analyze the inhibition effect of full degradation barley straws on algal. We prepared a number of 50×20×25 cm glass tanks and aerators, and selected mature dry barley straw as the test material. Barley straws were cut into <;1 cm small pieces or crushed directly. Barley straw in the water (the natural state placed more than two weeks to remove chlorine ion) in the aeration state before continuing degradation of 15 to 30 days, then remove the water the same way again (in this case water use culture medium) to continue the degradation of 15 to 30 days. The temperature was maintained at 20 to 25 °C; barley straw in the degradation process of the full removal of nitrogen and phosphorus. Algae was collected from wild algae bloom, Microcysis aeruginosa, Aphanizomenon flosaquae, Spirogyra communis, Oscillatoria and Scenedesmus with microscope monitoring. Barley straw used 0.1g/m<;sup>;3<;/sup>; as the gradient, and 0.3g/m<;sup>;3<;/sup>; 0.5g/m<;sup>;3<;/sup>; and 2g/m<;sup>;3<;/sup>; concentration began- to do under three parallel; while using not add to the degradation of barley straw “medium” + “algae” to deal with control. pH, EC, chla, algae type and quantity were observed every three days in 30 days. The results show that the physical and chemical changes in the nature of the water for the inhibition effects of degradation of barley straw. The change of pH and EC made barley straw in the chemical degradation process, the development of biological response to a favorable direction, which conducive to the generation and accumulation of algal material. Without suppression of the handle direct degradation of barley straw algae is not obvious, the full effects of algal addition to nitrogen and phosphorus in barley straw degradation significantly higher than that of the control, test period algae proliferate phenomenon, but over time was gradually reduced trend. Inhibition effect is a slight difference between the two, but not significant. Performance of the inhibition effect of different gradient content of the degradation of barley straw: 2.0g/m<;sup>;3<;/sup>;>;0.5g/m<;sup>;3<;/sup>;>;0.3g/m<;sup>;3<;/sup>;>;0.1g/m<;sup>;3<;/sup>;, when the concentration of degradation of barley straw when 0.1g/m<;sup>;3<;/sup>; basic loss of algal function; show that the degradation of barley straw algal role of broad-spectrum resistance. Microcystis aeruginosa water bloom beam filament algae, the Britain algae (P<;0.01) and water cotton algae and gate columns algae inhibit the degradation of barley straw (P<;0.01). Our results provide a reference for the control of water algal blooms.