Additional carbon source adding system for biochemical pool under low-temperature condition

The utility model discloses a system for adding a carbon source outside a biochemical pool under a low temperature condition, which comprises a carbon source storage tank, the feed end of the carbon source storage tank is connected with a chemical material tank through a carbon source adding pipeline, and the discharge end of the carbon source storage tank is communicated with an anoxic initial section valve of the biochemical pool through another carbon source adding pipeline; the anoxic initial section valve of the biochemical pool is connected with the biological pool; and a variable-frequency metering pump is also arranged between the discharge end of the carbon source storage tank and the carbon source adding pipeline. After the scheme is applied, the solid carbon source is dissolved more sufficiently under the sufficient backflow and stirring action of the chemical material receiving tank, and the problems that a chemical agent is caked to block a pipeline and the like are not easy to occur; the 5-ton s