Activated sludge method has a wide range of applications in the field of domestic wastewater treatment, and is one of the booster processes of integrated small-scale domestic wastewater treatment equipment. In the sewage treatment equipment cultivation bacteria and debugging stage, BOD exceeds the standard or not stable to meet the standard is a common water quality problems. Professional water quality commissioning specialists often through the growth of microorganisms as the basis for debugging, the following two microorganisms related to BOD debugging.
One, the servant worm
The servant worm is an activated sludge protozoa, mainly flagellates and ciliates as food, and sometimes swallowed unicellular algae.
The body length is about 135-230um, width is 75-98um, the body is solid, won't bend or change shape, the system is broad oval, the back is often protruding, the abdomen is flattened, the back half is a little less narrow than the front half, the back is rounded, the mouth rim area is large and long, the front tentacle hairs have 7, the buttock tentacle hairs 4, the telescopic vesicle is located in the back half of the right side, and the macronucleus is in the form of very long bands. Often appear in the lower BOD load, when the treatment effluent BOD is usually 10mg/l. Therefore, it is one of the reference indexes for small domestic sewage treatment equipment for BOD commissioning.
Two, tailed echinoderms
Tailed echinoderms to algae, flagellates as a food source, sometimes also eat rotifers. In the activated sludge is not common, if it appears then the treated water BOD is usually lower, but also small domestic sewage treatment equipment water quality commissioning reference basis. Its shape is long oval, but the two sides are almost parallel, there is a depression in the mouth edge, the ciliary system has 8 anterior tentacles, 5 abdominal tentacles, 5 hip tentacles, two of the hip tentacles obviously protruding outside the body, the body is very strong, the back of the 3 tail tentacles are long and hard, and there is a short seta on the back. Movement is inflexible, sometimes staying while foraging, and the body is filled with inhaled algae.
Microbial indicators in the commissioning process, late stable operation and process adjustment, plays an important role in the indication, not only the BOD indicators and microorganisms have a close connection, domestic sewage treatment equipment with COD, NH3-N, SS and other pollutants indicators can also be reflected from the microbial growth.