天津市原位生物化学法治理修复黑臭底泥的试验研究

研究采用室内模拟的方法,探讨了黑臭底泥生物-化学法原位修复中自制生物-化学复合药剂(以"反硝化细菌-硝酸钙"为主要原料)投加量对底泥理化性质变化及上覆水水质变化的影响。综合考虑,最终确定适合底泥致黑臭污染物去除且节约成本的最佳处理剂投加量为2 000mg/L(以硝酸钙-N计)。以此投加量将底泥处理剂埋入试验用底泥30d后,上覆水(400ml)TP由0.50mg/L降至0.36mg/L;CODCr、氨氮、硝态氮、亚硝态氮分别由31mg/L、0.10mg/L、0.65mg/L、0.07mg/L增加至325mg/L、30.27mg/L、4.91mg/L、13.55mg/L,底泥AVS由1.31μmol/g降至0.35μmol/g;底泥外观疏松膨胀、由黑变黄。判断此投加量下底泥处理剂对黑臭底泥治理情况好,可以此为依据进一步进行天津市某河道黑臭底泥原位修复中试研究,以确定最优投加量。

Experimental study on in-situ biochemical treatment for remediation of black-odor river bottom sediment in Tianjin

In this study, we used t he labor ator y simulation method to investig ate the changes of the phy sical and chemical pro per2 ties o f bot tom sediment and the overly ing wat er qualit y as a function of the dosage of self2made bio2chemical compounding ag ent ( w ith "denitrifying bacteria2calcium nitrate" as the main raw material) in the in2 situ biochemical remediation o f black2odor sedi2 ment. Based on comprehensive consider atio n, we determined t hat t he o ptimal and cost2saving do sag e of treatment ag ent for the remov al o f black2o do r pollutants should be 2 000 mg / L ( calculated as calcium nitr ate2N) . After bury ing the sediment tr eatment agent in the test sediment fo r 30 day s, w e fo und the T P of the ov erlying w ater ( 400 ml) w as r educed fr om 01 50 mg/ L to 01 36 mg/ L; CODCr , ammonia nitr og en, nitr ate nitr og en, and nitrite nitr og en respect ively increased from 31 mg/ L, 01 10 mg/ L, 01 65 mg/ L, and 01 07 mg / L to 325 mg / L, 301 27 mg / L, 41 91 mg/ L, and 131 55 mg/ L; the sediment AVS w as r educed from 11 31 Lmo l/ g t o 01 35 Lmol/ g ; the sediment looked loo se and ex panded, and tur ned from black to yellow . We judged that this dosag e wo rked w ell on the treatment of black2odor sediment. It can be used as the basis fo r furt her pilo t st udy o n the in2situ remedia2 tion of black2odor sediment in a river co urse in Binhai New Area o f Tianjin, in or der to determine the optimal dosag e.