Concentration method of high-quality carbon source for sewage treatment

Abstract

The invention provides a concentration method for a high-quality carbon source used for sewage treatment. The concentration method comprises the following steps: subjecting municipal sludge with water content of 80% to low-temperature carbonization or pyrohydrolysis so as to allow biomass in the sludge to be pyrolyzed; then allowing the sludge to enter an ammonia-nitrogen air-stripping tower for air stripping so as to allow the removal rate of ammonia and nitrogen to reach 75 to 85%; and carrying out filtering and interception a plurality of times, subjecting the obtained concentrate to concentration and carrying out collection, wherein C / N, i.e., BOD / COD, of a collected concentrate is greater than 0.3, and the concentrate is used as the high-quality carbon source for sewage treatment. The invention has the following beneficial effects: pyrolytic liquid released after dehydration of the sludge is subjected to concentration twice; the concentration of BOD in the pyrolytic liquid obtained after sludge dehydration is in a range of 7, 500 to 20, 000 mg / L, and the concentration of BOD is increased by 12 to 18 times after concentration twice, so the value of C / N, i.e., BOD / COD, is greatly increased, the high-quality carbon source is obtained, and removal of total nitrogen is benefited; and thus, the content of total nitrogen in effluent reaches the standard, and sewage treatment cost is substantially reduced.

Description

technical field [0001] The invention relates to the field of concentrating high-quality carbon sources for sewage treatment, in particular to a high-quality carbon source concentrating system using membrane treatment technology. Background technique [0002] After the “Eleventh Five-Year Plan” and “Twelfth Five-Year Plan” for nearly 10 years, the total emission reduction work has been vigorously promoted, and the two indicators of chemical oxygen demand and ammonia nitrogen have been improved. However, the two indicators of total phosphorus and total nitrogen have not been polluted In 2014, total phosphorus, chemical oxygen demand and five-day biochemical oxygen demand became the primary pollution indicators of the freshwater environment and lake environment in the country, and the main pollution indicators of the national control monitoring points in the coastal waters of the country were inorganic nitrogen. and active phosphate, the exceeding rates were 31.2% and 14.6%, an...

AI Technical Summary

Problems solved by technology

At present, to solve the problem of insufficient carbon sources, the main consideration is to add additional carbon sources (such as methanol, ethanol, acetic acid and glucose, etc.), but this will greatly increase the treatment cost of sewage treatment plants

Studies have shown that the cost of using methanol as a carbon source is equivalent to as much as 70% of the cost of water plant operation and management, or adding industrial wastewater rich in biodegradable organic matter to urban sewage, which will then increase additional transportation costs