Micro filter to remove solid suspension loop water function, the system of the biochemical filter also had a positive effect. Although the ammonia nitrogen conversion bacteria growth also need certain organic matter, but too much organic matter can cause digestive bacteria overgrowth, organic matter and ammonia nitrogen conversion bacteria in biofilm competition growth space, dissolved oxygen and nutrients. Organic matter digestion bacteria reproduction rate is much faster than ammonia nitrate bacteria, this will cause the breeding system of biological filter ammonia nitrogen removal rate is reduced, for example, when the biochemical oxygen demand (COD) and the ratio of ammonia nitrogen is greater than 2.7, ammonia nitrogen removal rate will drop by about 70%. Experiments show that using micro filter, biochemical filter inlet and outlet of the nitrite nitrogen concentration
mean difference is higher than 0.4 mg/L, do not use the micro filter of below average concentration of 0.1 mg/L.
Microfiltration machine is a rotating drum screen filter. Drum with the filter, when placed in water work drum, 2/5 filter submerged in water, waste water to be treated axially into the drum, by the screen outflow water impurities (fine suspended solids, fibers, pulp, etc.) Jibei trapped in the filter on the inner surface of the drum. When trapped in the filter impurities are brought to the upper part of the drum, is outside the screen backwash water will flow out into the sewage tank to achieve solid and liquid phases are separated by a timer or backwash liquid level sensor control. Filtered water is returned to the pool and reused. Microfiltration driven by hydraulic rotary machine, continuous automatic operation. 100m3 / h below the amount of processing equipment used throughout the entire food grade PP plastic, 100m3 / h or more with full 316L stainless steel, anti-corrosive, non-toxic and environmentally friendly. Mesh material is nylon, filtration accuracy: 30μ ~ 130μ, more than 95% removal rate of the solid particles, the number of revolutions microfiltration runtime is 1-3r / min, flow rate of 10-200m3 / h, backwash pressure of 0.2 to 0.3 MPa, flushing water for the production of 0.5-1.0% water. Microfiltration machine installed in the drain ponds and below ground level, artesian water can enter, head loss of about 0.5 meters. Microfiltration: treated water, low operating cost; simple to install, easy filter replacement, less maintenance, long life; low power consumption, 100m3 / H work consumes only 0.55KW (Rotary motor)....