帮忙翻译，急，在线等，谢谢

请帮忙翻译以下句子，特别是那个release在这里的意思，还有bank guarantees的理解：
I therefore request that you return one of the bank quarantees to this office to allow me to release this under the contract.

因此请求你们把银行的保证书返回一份给我们，答应我豁免这份合同。

release ：愿意是放松，豁免。
在这里可以认为是取消，让步。

因此，我需要你把银行的担保退回到这个办公室，这样我就能在合同范围内将钱给你了。

the design for the guangyuan city sewage treatment plant design.the city water, water features and related technology comparison, the final selection of the ab method as the sewage processing plant.the sewage treatment plant processes: sewage from coarse grille into the pump, into the sedimentation tank after the fine grid, in order to enter the a section aeration tank, intermediate sedimentation tank, b sedimentation tank, finally entered the final settling tank effluent after.sludge from a a segment and b segment after discharge by sludge pump house condensed into a pool, into the dewatering room, finally outward processing.in the design of the identified processes based on completed the main structure dimensions of the design and equipment selection etc..sewage treatment eventually reached the national comprehensive discharge (gb8978-1996) of an b standard

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