109 results about "Water index" patented technology

The invention discloses a standard reaching to ground surface water grade IV water urban sewage treatment process, which comprises the following treatment steps that the urban sewage is subjected to pretreatment so as to remove sand, stone and big particle materials in the sewage; after the pretreatment, different-point water feeding is performed to a pre-denitrification and anoxic pool; outlet water subjected to pre-denitrification sequentially passes through an anaerobic pool, the anoxic pool, an aerobic pool, a secondary sedimentation tank, a magnetic or sand loading flocculation deep dephosphorization settling pool and a reaction unit for sterilizing and oxidizing rest organic matters and improving dissolved oxygen in water, and is discharged after the standard reaching; mud water in the secondary sedimentation tank flows back to the pre-denitrification pool; mud water in the aerobic pool flows back to the anoxic pool; a carbon source can be additionally fed into the anoxic pool; the preferable carbon source and the carbon source precise control mode are favorable for the target realization; the problem of the conventional grade IV water standard reaching is solved through oxidization, sterilization and oxygen charging measures. The process has the advantages that the multiple regions are used for reasonably allocating the inlet water; the carbon source is sufficiently utilized; the sludge age is more reasonable; various conventional problems and the practical problem that the grade IV water standard is difficult to reach are solved; each outlet water index is enabled to stably reach the grade IV water standard.