矿山井下排放的废水中含有一定量的矿泥,有时每立升水中含有悬浮物400毫克左右,有时超过500毫克,个别时候高达1500毫克以上,超过国家规定排放标准两倍多。为此,按规定我们每月要缴纳排污费1500元。上级环保机关也多次要求我矿治理解决这一问题。为保护环境消除污染,我们利用井下废旧坑道做蓄水池,使井下污水在其中沉淀,澄清后 Mine discharge of waste water contains a certain amount of sludge, and sometimes every liter of water contains suspended solids of about 400 mg, sometimes more than 500 mg, individually up to 1500 mg or more, more than twice the national emission standards. To this end, according to the regulations we have to pay sewage charges 1,500 yuan per month. Higher-level environmental protection agencies have also repeatedly asked mine management to solve this problem. In order to protect the environment from pollution, we make use of underground waste tunnels as reservoirs, in which underground sewage sedimentation, clarification