Traditional water treatment process introduction

To be honest, there are too many processes, pure water process is not as much as wastewater process, the following is just part of the wastewater process reference, I hope to help you:

The first section of the principle of activated sludge process

Activated sludge process is a kind of wastewater aerobic biochemical treatment technology with the widest application, and it mainly consists of aeration tank, secondary sedimentation tank, aeration system, as well as the sludge reflux system and so on. Wastewater enters the aeration tank at the same time with the activated sludge returning from the bottom of the primary sedimentation tank and the secondary sedimentation tank, and through aeration, the activated sludge is suspended and comes into full contact with the wastewater. Suspended solids and colloidal substances in the wastewater are adsorbed by the activated sludge, while soluble organic matter in the wastewater is used by microorganisms in the activated sludge as nutrients for their own reproduction, metabolically transformed into biocells and oxidized into the final product (mainly CO2). Non-soluble organic matter needs to be converted into soluble organic matter before it is metabolized and utilized. Wastewater is thus purified. After purification, the wastewater and activated sludge are separated in the secondary sedimentation tank, and the upper effluent is discharged; a part of the sludge after separation and concentration is returned to the aeration tank to ensure that the aeration tank maintains a certain concentration of activated sludge, and the rest of it is residual sludge, which is discharged from the system.

The second section of anaerobic treatment process

Anaerobic treatment technology is an effective technology to remove organic pollutants and mineralize them, which transforms organic compounds into methane and carbon dioxide. Anaerobic treatment has many advantages over aerobic treatment:

(1) For high/medium concentration wastewater (COD>1000mg/L) anaerobic is not only much less expensive to run than aerobic treatment, but also recovers biogas, which is a capacity process;

(2) With modern high-load anaerobic reactors, the volume of the reactor required to treat the wastewater is much smaller;

(3) Anaerobic treatment can be applied to a variety of different sizes of wastewater treatment projects;

(4) Anaerobic treatment has low energy consumption, about 10% to 15% of aerobic treatment process;

(5) Anaerobic treatment has a small sludge production, about 10% to 15% of aerobic treatment process;

(6) Anaerobic treatment has low nutrient demand.

Anaerobic technology has evolved to the point where some of its early disadvantages no longer exist. However, from a microbiological and chemical point of view, anaerobic treatment provides only a pretreatment, and it generally requires post-treatment to remove residual organic matter from the water.

Section III oxidation ditch process

Oxidation ditch is a modified activated sludge method, its aeration tank is closed ditch shape, sewage and activated sludge mixture in which the circulation flow, so it is called "oxidation ditch", also known as "circular aeration tank

It is called "oxidation ditch", also known as "circular aeration tank".

The process is characterized by: (1) simplified pretreatment oxidation ditch hydraulic retention time and sludge age than the general biological treatment method is long, suspended organic matter and dissolved organic matter can be removed at the same time to get a more thorough removal of the residual sludge discharged has been a high degree of stabilization, so the oxidation ditch is not the first sedimentation tank, sludge does not need to carry out anaerobic digestion.

(2) covers an area of less than in the process of omitting the first sedimentation tank, sludge digestion tank, and sometimes omit the second sedimentation tank and sludge reflux device, so that the sewage plant not only does not increase the total area, on the contrary, can also be reduced.

(3) with the characteristics of the push-flow flow oxidation ditch with push-flow characteristics, so that the dissolved oxygen concentration in the direction of the formation of concentration gradient along the length of the pool, the formation of aerobic, anoxic and anaerobic conditions. Through the reasonable design and control of the system, the best phosphorus and nitrogen removal effect can be achieved.

(4) do not set up a second sedimentation tank simplifies the process of oxidation ditch and two sedimentation tanks built as a single oxidation ditch, as well as in recent years the development of alternating oxidation ditch, can not use the two sedimentation tanks, so that the treatment process is more simplified.