Laundry Wastewater Treatment

O3tech 2016-6-28 14:32:19

Laundry Wastewater Treatment

Classification of water:

Class 1: Drinking water

Class 2: Tap water

Class 3: Water cannot be in contact with the skin and can't swim

Class 4: Sewage

Class 5: Stinking ditch

Features of laundry wastewater treatment:

The laundry wastewater is a kind of washing wastewater, which has the characteristics of large amount of water, light pollution and stable water quality. Main pollutants: surface active agent, liquid caustic soda, fungicides, preservatives, bleaching agent, softening agent, fatty, vegetable oil, protein and other dissolved organic matter and clay, short fiber and other non dissolved impurities. Wastewater color is not high, with a certain CODCr and BOD values. LAS concentration is low, generally in the dozens of mg/L or so. LAS in the laundry wastewater from cleaning work clothes used in the detergent, with a certain temperature, 8-11 in the pH or so.

According to industry experience, laundry sewage standard:


PH value





Emission standard





40 times


PH value: It refers to the degree of acid and alkali in the water;

SS: It refers to the amount of suspended solids in the discharge of sewage, 60mg/l refers to 1 liters of sewage solids suspended solids is not greater than the quality of 60mg;

COD: Chemical oxygen demand, also known as chemical oxygen demand (chemicaloxygendemand), is referred to as COD. It is the use of chemical oxidation agent, such as potassium permanganate to oxidize and decompose oxidizable substances in water (such as organic matter, nitrite, ferrous salt, sulfide, etc.) and according to the amount of residual oxidant calculated oxygen consumption. It is the same as the biochemical oxygen demand (BOD), is an important indicator of water pollution. COD units are ppm or mg / L, the smaller the value, the more light water pollution.

BOD: BOD (biochemical oxygen demand of shorthand): biochemical oxygen demand or biochemical oxygen demand (5, chemical oxygen demand (COD) is a comprehensive indicator of organic compounds in water and oxygen content of pollutants. Biochemical oxygen demand is defined under the conditions, the decomposition of microorganisms in the water of some of the oxidation of substances, especially the decomposition of organic compounds in the biochemical process of consumption of dissolved oxygen. The higher the value of the organic pollutants in water, the more serious the pollution is.

Chroma:The color can be divided into "apparent color" and "true color ". Without removal of suspended solids of water with color, including the color produced by dissolved substances and dissolution of suspension, called "color". For water that is clean or with low turbidity, the two colors are similar. For industrial waste water with deep color, its color is mainly due to the colloid and suspended matter, so it can be determined according to the needs of the "true color" or "apparent color".


Ozone concentration plays a vital role in sterilization, decolorization and decreasing of COD value. Ozone concentration affects the sterilization effect. High concentration oxygen source ozone machine exports concentration up to 66.7mg/L which is enough for decolorization.