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Anaerobic biological treatment
Including anaerobic digestion, hydrolysis acidification tank, UASB, etc. Anaerobic biological treatment is an organic sewage treatment method that uses facultative anaerobic bacteria and obligate anaerobic bacteria to degrade macromolecular organic matter in sewage into low-molecular compounds, and then convert it into methane and carbon dioxide. It is divided into acid digestion and alkaline digestion. Two stages. In the acid digestion stage. The action of external enzymes secreted by acid-producing bacteria turns macromolecular organic matter into simple organic acids and alcohols, aldehyde ammonia, carbon dioxide, etc.; in the alkaline digestion stage, the metabolites of acid digestion are further decomposed into methane bacteria under the action of methane bacteria Biogas composed of methane, carbon dioxide, etc. This treatment method is mainly used for the treatment of high-concentration organic wastewater and fecal sewage. Advantages: 1) Low energy consumption 2) Recyclable bioenergy (biogas) 3) Less microorganisms (sludge) produced per unit mass of substrate removed 4) The whole process does not require oxygen, so it is not limited by the oxygen transfer capacity, and it Has a high load capacity
Biological treatment under natural conditions
(1) The stable pond will be properly artificially repaired to build the pond, and the embankment and anti-seepage layer shall be set up to treat the sewage depending on the microorganisms growing in the pond. Advantages: 1) Can make full use of terrain, simple structure and low construction cost. 2) It can realize sewage resource utilization, sewage recovery and reuse, and realize water circulation, which not only saves water resources, but also obtains economic benefits. 3) Low processing energy consumption, easy operation and maintenance, and low cost. 4) Beautify the environment and form an ecological landscape. 5) Low sludge output. 6) It can withstand the large-scale fluctuation of sewage water volume, and its adaptability, impact resistance and ability are strong. (2) Land treatment method A general term for methods of improving water quality with soil and plants. At the same time, the water and nutrients of wastewater are used to nourish the land. The land treatment methods mainly include irrigation, flood irrigation and high irrigation rate penetration. Modern sewage treatment technology can be divided into primary, secondary and tertiary treatment according to the degree of treatment. The primary treatment mainly removes the solid pollutants in the suspended state in the sewage. Most of the physical treatment methods can only complete the requirements of the primary treatment. After the primary treatment of sewage, BOD can generally remove about 30%, which does not meet the discharge standard. The primary treatment belongs to the pretreatment of the secondary treatment. The secondary treatment mainly removes colloidal and dissolved organic pollutants (BOD, COD substances) in the sewage, and the removal rate can reach more than 90%, so that the organic pollutants can reach the discharge standard. Tertiary treatment, further processing of refractory organic matter, nitrogen and phosphorus and other soluble inorganic substances that can lead to eutrophication of the water body.
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