Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product

A wastewater treatment and biomass technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution, inconvenient transportation, difficult to dissolve, etc., and achieve strong Adsorption capacity, good adsorption effect, large specific surface area effect

Inactive Publication Date: 2017-11-24
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Biomass energy is a kind of renewable energy with large quantity, wide range and low cost, but it is not easy to transport because of its large volume and low calorific value.
Combustible gas with high calorific value and convenient transportation can be obtained by gasifying biomass. However, due to impurities such as dust and tar, it is necessary to wash the combustible gas generated by the biomass gasification furnace. T

Method used

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  • Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product
  • Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product
  • Method for treating biomass gasified gas washing wastewater and for resource utilization of wastewater treatment product

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1:

[0029] The amount of wastewater generated is 5m 3 / h, the biomass gasifier works continuously for 24 hours a day, and the daily output of wastewater is 120m 3 / d.

[0030] The wastewater quality indicators are as follows:

[0031]

[0032] Pass the biomass gasification and gas scrubbing wastewater into a cyclone separator to remove substances with a density greater than water;

[0033] After that, the wastewater is passed to the intermediate pool to buffer the water quality, reduce the water temperature, remove large particles, and adjust the pH value of the wastewater to 5.0;

[0034] After that, the wastewater flows into the coagulation sedimentation tank, and the polyaluminum chloride with a mass percentage of 0.07% (prepared as a 5% solution before use) is added. After 30 seconds of rapid stirring, slow stirring for 20 minutes, and then 0.003% of polyaluminum chloride Acrylamide (prepared into a 0.2% solution before use), stir slowly for 10 minutes, and stand fo...

Example Embodiment

[0041] Example 2:

[0042] Take the treated wastewater from the coagulation section of the plant's biomass gasification wastewater. The water quality indicators are as follows:

[0043]

[0044] The wastewater or the pH value is adjusted to the adsorption tower filled with walnut shell activated carbon and coconut shell activated carbon. The activated carbon filling amount is 4kg / t wastewater, and the residence time of the wastewater in the adsorption tower is controlled to 120 minutes by the circulating pump.

[0045] After that, the wastewater flows into two clean water tanks.

[0046] After the wastewater is treated by the above process, the pollutants in the wastewater are removed to varying degrees. The water quality indicators after the two activated carbon adsorption treatments are measured as follows:

[0047]

[0048] Walnut shell activated carbon has a better adsorption effect on the organics in wastewater than coconut shell activated carbon; the same applies to walnut shell a...

Example Embodiment

[0049] Example 3:

[0050] Collect the waste walnut shell activated carbon and anthracite after multiple adsorption, the analysis results are as follows:

[0051]

[0052] The waste walnut shell activated carbon and anthracite are ground into powder below 180 mesh.

[0053] Then, weigh 66 g of anthracite powder, 0.24 g of sodium methylene naphthalenesulfonate-sodium styrene sulfonate-sodium maleate and 40 ml of deionized water.

[0054] Then, mix the sodium methylene naphthalenesulfonate-sodium styrene sulfonate-sodium maleate and deionized water, and stir thoroughly until completely dissolved.

[0055] Then add anthracite powder, mix and stir evenly to prepare coal water slurry 1.

[0056] Then, weigh 33 g of waste walnut shell activated carbon and 33 g of anthracite powder, 0.24 g of sodium methylene naphthalenesulfonate-sodium styrene sulfonate-sodium maleate and 40 ml of deionized water.

[0057] Then, mix the sodium methylene naphthalenesulfonate-sodium styrene sulfonate-sodium malea...

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Abstract

The invention discloses a method for treating biomass gasified gas washing wastewater and for resource utilization of the wastewater treatment product. The method can effectively remove COD in the wastewater and reduce the concentration of organisms; the treated wastewater can be recycled or discharged up to standard; the wastewater treatment product serves as one of the raw materials to prepare coal water slurry. The method mainly comprises the following steps: (a) feeding the biomass gasified gas washing wastewater into a cyclone separator to remove the substances of which the densities are higher than that of water; (b) feeding the wastewater into an intermediate water tank, buffering the water quality, and reducing the water temperature to remove large-particle substances, and regulating the pH value of the wastewater; (c) feeding the wastewater into a coagulation sedimentation tank to remove fine-particle substances, colloidal substances and some of ammonia nitrogen; (d) feeding the wastewater into an activated carbon adsorption tower to remove most of the soluble organic substances; (e) feeding the wastewater into a clear water tank for recycling or discharging up to standard; (f) preparing coal water slurry by taking the adsorbed waste activated carbon as a raw material.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating biomass gasification and scrubbing wastewater and resource utilization of wastewater treatment products. Background technique [0002] Biomass energy is a kind of renewable energy with large quantity, wide range and low cost, but it is not easy to transport because of its large volume and low calorific value. Combustible gas with high calorific value and convenient transportation can be obtained by gasifying biomass. However, due to impurities such as dust and tar, it is necessary to wash the combustible gas generated by the biomass gasification furnace. The waste water generated during the gas washing process contains a large amount of difficult Dissolved and refractory organic matter, high concentration of volatile phenols, have inhibitory and toxic effects on microorganisms, and the biodegradability of wastewater is poor. Conventional water ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C10L1/32
CPCC02F1/283C02F1/38C02F1/5245C02F1/56C02F1/66C02F9/00C02F2001/007C10L1/326
Inventor 徐美娟高夫燕蒋跃军李建新王永川
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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