Experimental Study on In-situ Remediation of Compound Contaminated Sediment of a River in Shenzhen with Chemicals

Abstract

Aiming at the black and odor problem of the gushing water and sediment of a river in Shenzhen, based on the results of sampling and testing, we independently developed an in-situ oxidation remediation agent for polluted sediment composed of oxidants, flocculants and pH regulators, and carried out in-situ repair of chemical agents without and with overlying water indoor test to verify. The test and monitoring results show that the agent can not only significantly reduce the ammonia nitrogen and organic matter content in the bottom sludge, but also can better remove the ammonia nitrogen in the overlying black and odorous water. In order to get closer to the actual situation, using the reagents developed to repair contaminated sediments at a certain flow rate has also achieved good experimental results.