2results about How to "Realize synchronous removal" patented technology

A method for regulating nitrous oxide formation and resource recovery during nitrate wastewater treatment, relating to the field of wastewater treatment technology, is disclosed. The method utilizes a DAMO culture primarily composed of Candidatus Methanoperedens nitroreducens, with added Fe(III), to co-treat nitrate wastewater and anaerobic digestion effluent, thereby achieving NO3 reduction in wastewater. ‑ Simultaneous removal of dissolved methane generates N2O, which is then co-combusted with biogas produced from the anaerobic digestion of sludge, increasing energy recovery and providing a solution for achieving energy self-sufficiency in wastewater treatment plants.

The invention belongs to the technical field of alumina production. The invention provides a deep purification process of a sodium aluminate solution. The deep purification process comprises the steps of pretreatment, quaternary synergistic impurity removal, first-stage solid-liquid separation, oxalic acid selective decalcification, second-stage refined filtration and residue treatment. According to the method, a four-element synergistic impurity removal system of barium salt, sodium sulfide, quick lime and a desiliconizing agent is innovatively constructed, impurities such as silicon, iron, phosphorus, titanium, vanadium, copper, lead and zinc ions and organic matters in the sodium aluminate solution are synchronously and deeply removed through function division and synergistic interaction, calcium ions are selectively removed through oxalic acid, and finally the high-purity sodium aluminate solution is obtained for producing high-purity aluminum oxide. According to the method, the problems of poor impurity removal pertinence, high impurity residue and large secondary pollution risk of a traditional single agent are solved, the removal rate of various impurities is larger than or equal to 99%, Ca in the purified solution is smaller than or equal to 0.001 g / L, the method adapts to the Bayer process and sintering process aluminum oxide production process, the purification efficiency is high, the process is compact, and the method is environmentally friendly and economical.