A kind of composite microbial preparation for treating black and smelly rivers and its preparation method

Abstract

The invention relates to a composite microbial preparation for treating a black and odorous river and a preparation method thereof. The composite microbial preparation is made from: Thiobacillus denitrificans powder 40-60 parts, composite Bacillus powder 10-40 parts and composite Saccharomyces cerevisiae powder 10-40 parts. Strains for degrading sulfides and organics in black and odorous sediment and suitable for growing in the black and odorous sediment are specifically screened, the combination of Thiobacillus denitrificans efficient in degrading hydrogen sulfide and removing nitrogen, Bacillus amyloliquefaciens capable of generating rich enzymes such as protease, amylase and cellulase, Saccharomyces cerevisiae, Candida utilis and facultative anaerobic Bacillus licheniformis enables the preparation to quickly improve the water quality of the black and odorous river and remove sediment blackness and odor.

Description

technical field [0001] The invention relates to the technical field of treatment of black and odorous rivers, in particular to a composite microbial bacterial agent for rapidly controlling black and odorous rivers and reducing sediment and a preparation method thereof. Background technique [0002] With the development of my country's economy and the increase of population, the water consumption is constantly increasing, and a large amount of farmland runoff without effective treatment, industrial wastewater and domestic sewage are discharged into rivers, and some rivers are almost reduced to pollution-inducing rivers. The pollution concentration has far exceeded the self-purification capacity of the river, and most of the river has been in a state of black and odor for a long time, seriously affecting the life of residents along the river and the image of the city. A large number of water pollutants are silted up, the thickness of the sediment is increasing, and the cross s...

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Problems solved by technology

[0004] 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, 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 more than 96% still takes about one month; Yu Guangwei and others disclosed an in-situ oxidation technology for black and odorous river sediments based on denitrification and desulfurization in Patent No. 201310230547.6. This technology includes adding sediment oxidizer (a mixture of calcium nitrate and sodium nitrate) by wet or dry method to black and odorous rivers, ammonia nitrogen extraction agent (sodium chloride or potassium chloride) and acid-base regulator (lime or dilute nitric acid), which can remove sulfur, nitrogen and phosphorus at the same time, quickly eliminate the black odor of the river, inhibit the release of nitrogen and phosphorus in the sediment, and improve the water quality. The main reason is to add some chemical oxidants to promote the denitrification and sulfur oxidation in the sediment However, Murphy T P and others believed that the addition of calcium nitrate can accelerate the biodegradation of PAHs (polycyclic aromatic hydrocarbons), but after adding calcium nitrate, the degradation of organic matter in different regions varies greatly

Phosphorus-containing organic matter can provide nutritional phosphate to overcome the lack of biologically available nutrients for nitrate-precipitated phosphate, but organic matter with low phosphorus content cannot raise enough phosphate

Calcium nitrate has a large difference in the inhibition of phosphorus in different regions, and therefore, the degradation of organic matter also shows a large difference

In addition, the biological oxygen demand of river polluted sediment is relatively high, and the oxidant that needs to be added in the restoration is relatively large, so there are problems of high cost and difficult implementation

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