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Method for preparing salt-resistant denitrifier with coking wastewater

A technology of coking wastewater and nitrogen bacteria agent, which is applied in the field of water treatment, can solve the problems of heavy screening, separation and cultivation of halophilic bacteria, difficulty in ensuring the treatment environment of coking wastewater containing salt in halophilic bacteria, and achieve simple and convenient operation , Stable treatment effect, the effect of large impact load

Inactive Publication Date: 2017-05-31
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the screening, isolation and cultivation of halophilic bacteria is a heavy workload, and it is difficult to ensure that the selected halophilic bacteria can stably adapt to the treatment environment of saline coking wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Embodiment 1, a kind of method that utilizes coking waste water to prepare salt-tolerant denitrification bacterial agent, inoculates salt-tolerant denitrification bacterial agent in the aerobic pool, makes the concentration of suspended solids in the pool maintain at 100 ~ 500mg / L, divides 2-5 time intervals, each time interval is 5-40 days; in each time interval, coking wastewater is gradually added to the aerobic pool according to a certain influent gradient, and soda ash and dihydrogen phosphate are added at the same time, The concentration of suspended solids in the pool is increased sequentially; until the concentration of suspended solids in the pool reaches 2500~3500mg / L, a salt-tolerant denitrification bacterial agent is prepared; the gradient of the influent is: coking wastewater accounts for the total amount of influent in this stage. The percentage gradient of the amount is 3-10, the gradient difference is 5%-40%, and each water inflow gradient is maintained fo...

Embodiment 2

[0029] Embodiment 2, a kind of method that utilizes coking wastewater to prepare salt-tolerant denitrification bacterial agent, its specific steps are as follows:

[0030] (1) Inoculate the salt-tolerant denitrification bacteria into the aerobic pool to maintain the concentration of suspended solids in the pool at 100 mg / L;

[0031] (2) Within 6 days, gradually add coking wastewater into the aerobic tank according to a certain influent gradient, and add soda ash and dihydrogen phosphate at the same time, so that the salt-tolerant denitrification bacteria agent gradually forms salt-tolerant activated sludge, controlling pollution The mud concentration reaches 1000~1500mg / L; the influent gradient is: the percentage gradient of coking wastewater in the total influent water in this stage is 6, respectively 1%, 10%, 25%, 45%, 75% , 100%, each influent gradient range is maintained for 1 day;

[0032] (3) Within 16 days, gradually add coking wastewater into the aerobic tank accordin...

Embodiment 3

[0035] Embodiment 3, a kind of method that utilizes coking wastewater to prepare salt-tolerant denitrification bacterial agent, its specific steps are as follows:

[0036] (1) Inoculate the salt-tolerant denitrification bacteria agent into the aerobic pool to maintain the concentration of suspended solids in the pool at 500mg / L;

[0037] (2) Within 18 days, gradually add coking wastewater into the aerobic tank according to a certain influent gradient, and add soda ash and dihydrogen phosphate at the same time, so that the salt-tolerant denitrification bacteria agent will gradually form salt-tolerant activated sludge to control pollution. The mud concentration reaches 1000~1500mg / L; the influent gradient is: the percentage gradient of coking wastewater in the total influent water in this stage is 6, respectively 1%, 10%, 25%, 40%, 75% , 100%, and each influent gradient range is maintained for 3 days;

[0038] (3) Within 28 days, gradually add coking wastewater into the aerobic...

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Abstract

The invention provides a method for preparing a salt-resistant denitrifier with coking wastewater. The method comprises the following steps: inoculating a salt-resistant denitrifier into an aerobic tank, and maintaining the concentration of suspended solids in the aerobic tank to be 100-500mg / L for 2-5 time intervals, wherein each time interval lasts for 5-40 days; and in each time interval, gradually adding the coking wastewater into the aerobic tank according to certain water feeding gradients, and at the same time compensating sodium carbonate and dihydric phosphate, so as to gradually increase the concentration of the suspended solids in the aerobic tank till the concentration of the suspended solids in the aerobic tank is up to 2500-3500mg / L, thereby obtaining the salt-resistant denitrifier. By adopting the method provided by the invention, the purpose of biological denitrification under a high-salt condition of the coking wastewater can be achieved, and the method is applicable to not only the salt-containing coking wastewater industry, but also the salt-containing wastewater industry such as chemical industry, pharmacy, leather making, food, oil production and marine product processing, and is simple and convenient in process operation.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a salt-tolerant denitrification bacterial agent using coking wastewater. Background technique [0002] Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds such as oxygen, sulfur, and nitrogen produced during coking and coal gas high-temperature dry distillation, purification, and by-product recovery. It is a typical toxic and refractory organic wastewater. It has the characteristics of large changes in water quality and quantity, complex components, high content of organic matter, especially refractory organic matter, and high concentration of ammonia nitrogen. Generally speaking, coking wastewater does not contain salt or the total salt content is very small (about 0.1~0.3%), but if the coking plant is located in a saline-alkali land or a salt lake area, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C02F3/02C02F3/34C12R1/01C12R1/07
CPCC12N1/20C02F3/02C02F3/34Y02W10/10
Inventor 张彬彬田凤蓉崔庆兰李坤王强郭涛杨志林董自斌
Owner BLUESTAR LEHIGH ENG INST CO LTD
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