Membrane bioreactor (MBR) originated in the 1960s. MBR is widely used in the field of wastewater treatment and reuse because of its advantages of good effluent quality, stable operation, less excess sludge and small area. At present, MBR is mainly used in domestic sewage and urban sewage treatment.

The addition of stone involves cutting and polishing. Both of them form a solid content of waste water and the solid particles are usually fine in the polishing sequence. The particle size distribution is in the range of micro.

1. Paper wastewater pollutionThe main sources of paper waste are as follows:(1) The waste liquid from the cooking pulp (or straw pulp), which is called liquid;(2) The waste discharged by the beating machine and the fine pulper is called the beating waste;

With the gradual improvement of consumers' health awareness, more and more enterprises set foot in the field of sugar free. According to the investigation, some sugar free beverages mainly contain erythritol, while some sugar free products contain artificial sugar substitutes.

Slaughterhouse wastewater is generally reddish brown, with a bad smell, which contains a lot of blood, oil, hair, meat, bone, visceral debris, undigested food, feces and other pollutants, high content of solid suspended solids. Slaughterhouse wastewater has high content of organic matter and good biodegradability, but the high concentration of organic matter is not easy to degrade, so it is difficult to treat.