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Method for synchronously removing ammonia nitrogen in river sediment and overlying water body by using ammonia nitrogen release increasing agent

A technology of river sediment and release agent, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc. Eliminate problems such as river eutrophication, and achieve the effects of low preparation cost, good market prospect and simple process

Active Publication Date: 2021-06-25
UNIV OF SHANGHAI FOR SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the traditional methods can only remove nitrogen in the overlying water body, without considering the nitrogen exchange between the channel sediment and the overlying water body, so they cannot completely eradicate the problem of eutrophication in the river channel

Method used

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  • Method for synchronously removing ammonia nitrogen in river sediment and overlying water body by using ammonia nitrogen release increasing agent
  • Method for synchronously removing ammonia nitrogen in river sediment and overlying water body by using ammonia nitrogen release increasing agent
  • Method for synchronously removing ammonia nitrogen in river sediment and overlying water body by using ammonia nitrogen release increasing agent

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preparation example Construction

[0053] In another embodiment, the preparation method of described iron-loaded biochar comprises the following steps:

[0054] (a) Sieve the sawdust and mix with FeCl 3 The solution was mixed and soaked, stirred and soaked at room temperature, so that Fe 3+ Fully and evenly loaded on the surface of biomass, and then dried to constant weight;

[0055] (b) Co-pyrolyze the dried mixture under an inert gas atmosphere, and cool naturally to room temperature to obtain iron-loaded biochar, which is sieved for later use.

[0056] In another embodiment, FeCl 3 The concentration of the solution is 10~50mg L -1 , FeCl 3 The solution is fully mixed with wood chips, and the mixing specific gravity is FeCl 3 The solution accounts for 15-25wt% of wood chips.

[0057] In another embodiment, in step (a), drying is carried out at 40°C.

[0058] In another embodiment, in step (b), during co-pyrolysis: at 5-15°C min -1 The heating rate is increased to 450~550°C, and then stay for 1~3h; the...

Embodiment 1

[0068] In this embodiment, the method of synchronously removing ammonia nitrogen from the river sediment and the overlying water body using the ammonia nitrogen release agent adopts the following steps:

[0069] (1) figure 1 Flowchart for the preparation of the bottom sludge ammonia nitrogen release agent (iron-loaded biochar), pass the wood chips through a 2-mm sieve, and mix with FeCl 3 Solution (30mg L -1 ) mixed soaking, FeCl 3 The mixing ratio of the solution and the wood chips is 20wt%, and the OS40-S cantilever electric stirrer is used to stir and soak for 2 hours at room temperature, and the speed is 50r min -1 , the purpose is to make Fe 3+ Fully and evenly loaded on the surface of biomass; use HY TECH-HY5210 blast drying oven to dry the above samples to constant weight at 40°C.

[0070] (2) Put 20g of drying mixture in a quartz boat with a length of 10cm and a radius of 2cm, place the quartz boat in the quartz tube of the OTF-1200X-S small-scale high-temperature ...

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Abstract

The invention relates to a method for synchronously removing ammonia nitrogen in river sediment and an overlying water body by using an ammonia nitrogen release increasing agent, which comprises the following steps: adding the ammonia nitrogen release increasing agent into the sediment to promote the ammonia nitrogen in the sediment to be quickly released into the overlying water body, and denitrifying the overlying water body by combining a microbial aeration method to realize synchronous denitrification of the sediment and the overlying water body. The ammonia nitrogen release increasing agent is iron-loaded biomass charcoal. Compared with the prior art, the method has the following advantages: (1) nitrogen in the overlying water body and the bottom mud is synchronously removed, and integrated treatment of the overlying water body and the bottom mud of the riverway is realized; (2) compared with a method of applying an ammonia nitrogen release inhibiting agent to the bottom mud, the risk that ammonia nitrogen in the bottom mud can be released again to enter an overlying water body under the disturbance of external environmental factors can be thoroughly eliminated; and (3) the used materials are low in preparation cost, simple in process and wide in raw material source, and have a better market prospect.

Description

technical field [0001] The invention relates to a method for synchronously removing ammonia nitrogen from river bottom mud and overlying water body, in particular to a method for synchronous denitrification of river bottom mud and overlying water body through the combination of bottom mud ammonia nitrogen enhancement and release combined with microbial aeration. Background technique [0002] In recent years, the eutrophication of urban rivers has become more and more serious. Excessive discharge of nitrogen is one of the important reasons for the eutrophication of water bodies. This will lead to the reduction of large submerged plants and the proliferation of planktonic algae, which consumes dissolved oxygen in water and deteriorates water quality. , leading to massive fish kills. [0003] The traditional methods of controlling excessive nitrogen in rivers include physical methods, chemical methods and biological methods. Physical methods include water diversion flushing an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F3/10C02F3/34C02F3/30C02F101/16
CPCC02F11/00C02F3/109C02F3/108C02F3/34C02F3/30C02F2101/16Y02W10/10
Inventor 杨帆吕峻帆赵玲曹心德黄远东
Owner UNIV OF SHANGHAI FOR SCI & TECH
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