Denitrification sulphur removal-based in-situ black-odorous riverway bottom mud oxidization technology

Abstract

The invention discloses a denitrification sulphur removal-based in-situ black-odorous riverway bottom mud oxidization technology. The technology comprises the steps of: feeding a bottom mud oxidant, a bottom mud ammonia nitrogen extracting agent and a bottom mud acid-base conditioning agent into the black-odorous riverway in a wet-process or dry-process manner, the feeding quantity of the bottom mud oxidant ranges from (0.5-2):1 according to the mass ratio of the bottom mud oxidant and sulfide in the bottom mud, the feeding quantity of the bottom mud ammonia nitrogen extracting agent needs to meet the condition that the initial concentration of the bottom mud ammonia nitrogen extracted and released in interstitial water achieves more than 50mg/L, and the feeding quantity of the mud ammonia nitrogen extracting agent needs to meet the condition that the initial pH of the bottom mud is controlled to be 6.0-8.0. The sulfur, nitrogen and phosphorus of the mud can be synchronously removed, the blackness and odor of the riverway can be fast eliminated, the release of the bottom mud nitrogen and phosphorus can be inhibited, and the quality of water-in-water body can be improved; and the problem of eliminating the secondary release of bottom mud nitrogen in the black and odorous treatment process can be solved. The method is applicable to comprehensive treatment of a riverway (surge) taking organic matters, sulfide, nitrogen and phosphorus as mainly serious pollution sources.

Description

technical field [0001] The river channel (flush) treatment technology involved in the present invention specifically refers to an in-situ oxidation technology for black and odorous river channel sediment based on denitrification and desulfurization. Comprehensive treatment of polluted rivers (surges), especially suitable for in-situ comprehensive treatment of urban black and odorous rivers (surges). Background technique [0002] Black and odorous river channels and sediment accumulation are common phenomena in urban river networks in my country. Studies have shown that the long-term anaerobic decomposition of sediment organic pollutants produces H 2 Odors such as S and non-ferrous metal sulfides such as FeS are the main causes of black odor, and the secondary release of nitrogen and phosphorus from the sediment will cause eutrophication of the water body. In terms of river black and odor control, the current international popular method is to increase the oxidation-reducti...

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Problems solved by technology

In terms of river black and odor control, the current international popular method is to increase the oxidation-reduction potential of the sediment (such as adding calcium nitrate and calcium peroxide) to oxidize the sulfide in the sediment and inhibit the release of phosphorus in the sediment; among them, through Dosing calcium nitrate to eliminate river black odor has been applied in domestic and foreign projects. However, this technology has a long treatment cycle (1-2 years), and it is easy to promote the excessive release of ammonia nitrogen and nitrate, causing secondary pollution of nitrogen, etc. shortcoming

At present, some new attempts have been made at home and abroad to quickly eliminate the black and odor of sediment, such as adding other oxidants (calcium peroxide or hydrogen peroxide) while adding calcium nitrate, or shortening the treatment time by increasing the dosage of calcium nitrate. However, it is reported that the treatment cycle for the sulfide removal rate to reach over 96% still needs about 1 month; in addition, how to eliminate the secondary release of sediment nitrogen in the process of black and odor control has not yet been resolved, especially when adding bottom nitrogen It has not been reported that mud oxidizer can remove sulfide while realizing in-situ denitrification of sediment

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