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PAC Sewage Treatment Rate
Aug 29, 2017

PAC Sewage treatment rate

Flocculant is the most widely used drug in sewage treatment. It effectively improves the sewage treatment rate and makes the wastewater treatment more effective. Flocculation process is a key link in wastewater treatment process. Drug dosing to ensure water treated by the large sewage treatment equipment can conform to the provisions of the state emission standard, effectively prevent the deterioration of the present situation of water pollution, ensure that the ecological environment and sustainable development.

1 type of flocculant

The variety of flocculant, from low molecular to macromolecule, from single to compound, the general trend is to the cheap practical, non-toxic and efficient direction development. Inorganic flocculant is cheap but harmful to human health and ecological environment. Although organic polymer flocculant dosage, less sludge production, less flocculation ability strong, easy separation of floc, oil and suspended solids removal effect is good, but this kind of polymer of residual monomers has "three" effect (note to battery, carcinogenic, mutagenic), so that its application range is limited; Microbial flocculants are convenient to use because there is no secondary pollution. Microbial flocculants may replace or replace traditional inorganic polymers and synthetic organic polymeric flocculants in the future. However, the development and application of microbial flocculants are in the ascendant, and its characteristics and advantages show a broad prospect for the development of water treatment technology.

1.1 inorganic flocculant

Inorganic flocculant is divided into two main categories: preparations series and aluminum iron series, including aluminum sulfate was first developed by the United States, and has been in use today is an important inorganic flocculant. Most sewage treatment facilities in China have adopted one or more of them. Hong Kong when it was built, the stonecutters island sewage treatment works is one of Asia's largest wastewater treatment engineering, the chemical enhanced primary treatment (CEPT process) daily capacity of 1.7 million t, 3.5 million residents provide wastewater treatment service. It chose the ferric chloride in combination with polymer as flocculants and sludge dehydrating agent, its o-phenylenediamine for polymer ferric chloride 10 mg/L, only 1 mg/L, to remove suspended solid efficiency reached 80%, and biochemical oxygen demand (cod) removal efficiency reached 70%.